Residual gas separation and purification apparatus for pressure vessels

Abstract

The application discloses a pressure container residual gas separation and purification equipment, which comprises an air inlet pipe, a booster pump, two treatment pipes, a steady flow assembly, a first flow equalization assembly, a second steady flow assembly, a second flow equalization assembly, a third steady flow assembly, a filter assembly, a moisture absorption assembly, an adsorption assembly, a molecular sieve assembly, a pipe combining device, a compression pump, a first washing tower unit, a first separator, a second washing tower unit, a second separator and a heat exchange unit. The application can remove the high-content impurities such as hydrogen sulfide, carbon dioxide and water vapor in the residual gas in the natural gas in the pressure container, separate and purify the natural gas, and realize repeated utilization.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of residual gas recovery equipment, in particular to the pressure vessel residual gas separation and purification equipment. BACKGROUND

[0002] Liquefied natural gas is stored and transported by pressure vessels. With use or unloading, part of the residual gas in the pressure vessel cannot be directly used. Direct discharge of this part of the residual gas not only causes environmental pollution but also causes waste and danger. Therefore, it is necessary to collect, remove impurities and purify it for reuse.

[0003] Due to pressure relief during use and exchange with external gas during loading and unloading, the residual gas contains a high content of impurities such as hydrogen sulfide, carbon dioxide and water vapor. Effective separation of the impurity gas is needed to improve the purity of the natural gas, and finally liquefied treatment is performed. There is no gas separation and purification equipment for this type of residual gas. SUMMARY

[0004] In view of the above defects of the prior art, the purpose of the present application is to provide pressure vessel residual gas separation and purification equipment, which can remove the high content of impurities such as hydrogen sulfide, carbon dioxide and water vapor in the residual gas in the pressure vessel, separate and purify the natural gas, and realize reuse.

[0005] The purpose of the present application is achieved by the following technical scheme:

[0006] The pressure vessel residual gas separation and purification equipment comprises:

[0007] an inlet pipe;

[0008] a booster pump arranged in the inlet pipe;

[0009] two treatment pipes respectively communicated with the inlet pipe through first ball valves; the treatment pipes are sequentially provided with first flow stabilizing components, first flow equalizing components, second flow stabilizing components, second flow equalizing components, third flow stabilizing components, filter components, moisture absorbing components, adsorbing components and molecular sieve components along the flow direction of the natural gas;

[0010] a joint pipe in Y shape, two branches of which are respectively communicated with the ends of the two treatment pipes through second ball valves;

[0011] a compression pump arranged on the main pipe of the joint pipe;

[0012] a first washing tower unit communicated with the main pipe of the joint pipe through the compression pump;

[0013] a first separator communicated with the end of the first washing tower unit;

[0014] a second washing tower unit communicated with the end of the first separator.

[0015] a second separator, in communication with an end of the second scrubbing tower unit;

[0016] a heat exchange unit, in communication with an end of the second separator;

[0017] The first flow equalizing assembly comprises:

[0018] a first flow equalizing ring, provided with a first annular groove on an outer cylindrical surface, and provided with a first O-shaped silica gel ring in the first annular groove; the first flow equalizing ring is arranged in the processing pipe;

[0019] a first support frame, fixedly connected to an inner wall of the first flow equalizing ring;

[0020] a plurality of first flow equalizing members, rotatably and uniformly distributed on the first support frame; the rotation axis of the first flow equalizing members is parallel to the axis of the processing pipe; the first flow equalizing members are provided with wing plates, which are arranged at an angle with the rotation axis of the first flow equalizing members; the natural gas flowing through the surface of the first flow equalizing members impacts the wing plates, forcing the first flow equalizing members to rotate;

[0021] The first scrubbing tower unit comprises:

[0022] a scrubbing tower, which is a closed container structure;

[0023] at least one Venturi gas-liquid mixing unit, arranged in the scrubbing tower;

[0024] a scrubbing liquid circulation system, arranged outside the scrubbing tower; the liquid inlet is arranged at the bottom of the scrubbing tower, and the liquid outlet is in communication with the liquid inlet of the Venturi gas-liquid mixing unit;

[0025] a gas input pipeline, one end of which is in communication with the main pipe, and the other end of which is in communication with the gas inlet of the Venturi gas-liquid mixing unit through the scrubbing tower;

[0026] The first flow stabilizing assembly, the second flow stabilizing assembly and the third flow stabilizing assembly have the same structure; the first flow stabilizing assembly comprises:

[0027] a flow stabilizing ring, arranged in the processing pipe;

[0028] a flow stabilizing net, arranged in the flow stabilizing ring.

[0029] Further, the first flow equalizing member comprises:

[0030] a conical part, the tip of which points to the upstream of the natural gas; two wing plates are stacked on the conical part;

[0031] a cylindrical part, coaxially connected to the tail of the conical part, and having the same diameter as the tail of the conical part;

[0032] A circular truncated cone is coaxially arranged at the tail of the cylindrical part, and the axis of the circular truncated cone and the cylindrical part is provided with a through hole; a circular groove is arranged at the area opposite to the through hole of the conical part;

[0033] A thrust bearing is arranged at the bottom of the circular groove;

[0034] An axle is arranged in the circular groove through the through hole, and the head end of the axle is in contact with the thrust bearing; the tail end of the axle is fixedly connected with the first support frame; the axis of the axle is parallel to the axis of the processing tube;

[0035] A rotating bearing is arranged on the axle and in contact with the inner wall of the through hole;

[0036] The area occupied by the first flow uniformizing elements in the projection on the axis of the processing tube is not more than one eighth of the cross-sectional area of the inner cavity of the processing tube.

[0037] Further, the second flow uniformizing assembly comprises:

[0038] A second flow uniformizing ring is arranged in the processing tube, and the outer cylindrical surface of the second flow uniformizing ring is provided with a second annular groove, and the second annular groove is provided with a second O-shaped silica gel ring;

[0039] A second support frame is fixedly connected with the inner wall of the second flow uniformizing ring;

[0040] A plurality of second flow uniformizing elements are uniformly distributed on the first support frame; the axis of the second flow uniformizing element is parallel to the axis of the processing tube; the second flow uniformizing element comprises:

[0041] A first conical body;

[0042] A second conical body has the same bottom diameter as the first conical body; the bottom of the second conical body is coaxially connected with the bottom of the first conical body; the first conical body and the second conical body form a spindle shape; the connection between the first conical body and the second conical body is smoothly transitioned; the height of the second conical body is greater than the height of the first conical body; the tip of the second conical body is fixedly connected with the second support frame;

[0043] The area occupied by the second flow uniformizing elements in the projection on the axis of the processing tube is not more than one eighth of the cross-sectional area of the inner cavity of the processing tube.

[0044] Further, a plurality of spiral drainage grooves are arranged on the conical surface of the first conical body; the spiral drainage grooves are uniformly circumferentially arranged on the conical surface of the first conical body around the axis of the first conical body; the width and depth of the spiral drainage grooves increase with the distance from the tip of the first conical body;

[0045] The conical surface of the second conical body is provided with a plurality of flow stabilizing sheets, the plate surface of the plurality of flow stabilizing sheets is parallel to the axis of the second conical body; and the plurality of flow stabilizing sheets are uniformly distributed in a circumferential array on the conical surface of the second conical body around the axis of the second conical body.

[0046] The second support frame wraps the conical tip of the second conical body; and the end of the flow stabilizing sheet is fixedly connected with the support rod of the second support frame.

[0047] Further, the moisture absorption assembly comprises:

[0048] The fixed ring is provided with a third annular groove on the outer cylindrical surface, and a first O-shaped sealing ring is arranged in the third annular groove; the fixed ring is arranged in the processing pipe and is in seamless sealing connection with the inner wall of the processing pipe; a stepped opening that is reduced inward is arranged on the fixed ring; an arc-shaped sealing plate is arranged on the stepped opening; and the sealing plate is fixedly connected with the fixed ring through screws;

[0049] Two pieces of blocking nets are arranged on the two side surfaces of the fixed ring and are in seamless fixed connection with the end surface of the fixed ring; the two pieces of blocking nets and the fixed ring form a hollow circular cake-shaped containing space, and the moisture absorption particles are placed in the circular cake-shaped containing space;

[0050] The molecular sieve assembly has the same structure as the moisture absorption assembly, and molecular sieve particles are prevented from being placed in the circular cake-shaped containing space of the molecular sieve assembly.

[0051] Further, the processing pipe is provided with a first flow stabilizing assembly, a first flow equalizing assembly, a second flow stabilizing assembly, a second flow equalizing assembly, a third flow stabilizing assembly, a filtering assembly, a moisture absorption assembly, an adsorption assembly, a heat exchange assembly and a molecular sieve assembly, and semicircular stepped notches are arranged at the positions of the assemblies; semicircular sealing plates are hingedly connected at the stepped notches, a fourth annular groove is arranged on the lower surface of the semicircular sealing plate, a second O-shaped sealing ring is arranged in the fourth annular groove, the semicircular sealing plate is sealed with the stepped notch through a bolt mechanism, and an annular baffle is arranged in the processing pipe downstream of the stepped notch.

[0052] Further, four Venturi gas-liquid mixing units are uniformly arranged in a circumferential array in the washing tower around the axis of the washing tower; the Venturi gas-liquid mixing unit comprises:

[0053] The Venturi tube mixer is in communication with the liquid outlet of the washing liquid circulating system through the liquid inlet assembly; and the gas inlet is in communication with the gas input pipeline;

[0054] The mounting frame is fixedly connected at one end with the Venturi tube mixer and at the other end with the inner wall of the washing tower; the inner wall of the washing tower is provided with a fifth annular groove with an inner groove; and the liquid outlet of the Venturi tube mixer is flush with the fifth annular groove;

[0055] A flow guide pipe is provided at one end of the liquid outlet of the Venturi tube mixer and at the other end points to the fifth annular groove, and the flow guide pipe guides the flow smoothly; the angle between the axis of the liquid outlet of the flow guide pipe and the tangent at the intersection of the fifth annular groove is less than 30 degrees.

[0056] Further, the inner wall of the washing tower is provided with a spiral protrusion below the fifth annular groove; the cross section of the spiral protrusion is semicircular; the upper surface and the lower surface of the spiral protrusion are smoothly connected with the inner wall of the washing tower.

[0057] Further, the liquid inlet assembly comprises:

[0058] A liquid inlet flow distributor is arranged in the washing tower on the axis of the washing tower and below the inclined Venturi tube mixer, and the lower end is communicated with the liquid outlet of the washing liquid circulation system;

[0059] Four liquid outlet pipes are communicated at one end with the upper end of the liquid inlet flow distributor and at the other end with the liquid inlet of the Venturi tube mixer;

[0060] The liquid inlet flow distributor comprises:

[0061] A flow guide pipe is vertically arranged and communicated at the lower end with the liquid outlet of the washing liquid circulation system; the top end of the flow guide pipe is provided with four notches arranged uniformly around the axis;

[0062] A flow guide net plate is arranged in the flow guide pipe;

[0063] A flow guide head is arranged at the top of the flow guide pipe and is conical; the upper end surface of the flow guide head is seamlessly connected with the upper end surface of the flow guide pipe; the flow guide head and the four notches of the flow guide pipe form four liquid outlet holes, and the four liquid outlet holes are respectively communicated with the four liquid outlet pipes; the flow guide head is provided with flow guide grooves corresponding to the four notches, and the flow guide grooves are uniformly enlarged from the top point to the bottom edge.

[0064] Further, the washing liquid circulation system comprises:

[0065] A mechanical defoamer is communicated at the liquid inlet end with the bottom of the washing tower and at the gas outlet end with the upper part of the washing tower;

[0066] A liquid storage tank is communicated at the liquid outlet with the mechanical defoamer, and the top and the bottom are respectively provided with liquid inlet and liquid outlet;

[0067] A delivery pump is communicated at the liquid inlet end with the bottom of the liquid storage tank and at the liquid outlet end with the Venturi gas-liquid mixing unit;

[0068] The second washing tower unit structure is the same as the first washing tower unit; the washing agent in the first washing tower unit is an acidic chemical agent; and the washing agent in the second washing tower unit is an alkaline chemical agent.

[0069] Due to the adoption of the above technical solutions, the present application has the following advantages:

[0070] 1. By using two branch pipes to communicate with the main pipe, when the components in a branch pipe are maintained, the operation of the entire recovery system is not affected, ensuring the continuity and stability of production.

[0071] 2. By setting various impurity removal units in the branch pipe, one-time efficient treatment is achieved, reducing the treatment links and optimizing the treatment sequence. The first and second flow uniformizing components make the airflow in the branch pipe consistent as a whole, so that each area of each treatment unit can uniformly contact with the natural gas when passing through the subsequent treatment units (filtering components, adsorption components, moisture absorption components, heat exchange components, molecular sieve components), thereby making the treatment of natural gas more efficient, and avoiding the situation that a certain area of a treatment unit is inefficient or inactivated, resulting in that the natural gas flowing through the area is not effectively treated, ultimately affecting the finished natural gas.

[0072] 3. By the Venturi gas-liquid mixing unit, the natural gas and the chemical reaction absorbent are mixed, which can not only ensure the mixing efficiency, but also control the mixing degree by adjusting the flow rate of the chemical reaction absorbent and the pressure of the natural gas, thereby ensuring the mixing efficiency and improving the washing efficiency.

[0073] 4. The chemical reaction absorbent is circulated by the washing liquid circulation system, and is in a flowing state, which uniformly and fully contacts with the natural gas, thereby improving the reaction efficiency of the chemical reaction absorbent; the washing liquid circulation system realizes intermittent replacement of the chemical reaction absorbent outside the washing tower, thereby ensuring uninterrupted washing and the efficiency and stability of the washing production.

[0074] Other advantages, objects and features of the present application will be set forth in part in the specification which follows, and in part will become apparent to those skilled in the art upon examination of the following or can be learned by practice of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0075] The drawings of the present application are as follows:

[0076] Figure 1 It is a structural schematic view of the pressure vessel residual gas separation and purification equipment in the present embodiment.

[0077] Figure 2 It is a structural schematic view of the pressure vessel residual gas separation and purification equipment in the present embodiment. Figure 1 It is a structural schematic view of the pressure vessel residual gas separation and purification equipment in the present embodiment.

[0078] Figure 3 It is a structural schematic view of the pressure vessel residual gas separation and purification equipment in the present embodiment. Figure 2 It is a structural schematic view of the pressure vessel residual gas separation and purification equipment in the present embodiment.

[0079] Figure 4This is a cross-sectional view of the first flow equalization element in this embodiment.

[0080] Figure 5 for Figure 4 A schematic diagram of the left-side view structure.

[0081] Figure 6 for Figure 1 Schematic diagram of the structure at the CC section.

[0082] Figure 7 for Figure 6 Schematic diagram of the structure at the DD section.

[0083] Figure 8 This is a cross-sectional view of the second flow equalization element in this embodiment.

[0084] Figure 9 for Figure 8 A schematic diagram of the left-side view structure.

[0085] Figure 10 for Figure 8 A schematic diagram of the right-side structure.

[0086] Figure 11 for Figure 1 Schematic diagram of the EE section structure.

[0087] Figure 12 for Figure 1 Schematic diagram of the structure at the FF section.

[0088] Figure 13 for Figure 12 Schematic diagram of the structure at the GG section.

[0089] Figure 14 This is a top view of the adsorption component in this embodiment.

[0090] Figure 15 This is a schematic diagram of the cross-sectional structure of the first flow stabilizing component, the first flow equalizing component, the second flow stabilizing component, the second flow equalizing component, the third flow stabilizing component, the filter component, the moisture absorption component, the adsorption component, and the molecular sieve component on the processing tube in this embodiment.

[0091] Figure 16 This is a cross-sectional view of the first washing tower unit in the example.

[0092] Figure 17 for Figure 16 Enlarged structural diagram at point H.

[0093] Figure 18 for Figure 17 Schematic diagram of the structure at the JJ section.

[0094] Figure 19A schematic view of the top structure of the flow equalizing head in the example.

[0095] Figure 20 A schematic view of the structure of the K-K section. Figure 16 A schematic view of the structure of the K-K section.

[0096] Figure: 1. gas inlet pipe; 2. booster pump; 3. treatment pipe; 31. first flow stabilizing component; 32. first flow equalizing component; 321. first flow equalizing ring; 3211. first annular groove; 3212. first O-shaped silica gel ring; 322. first support frame; 323. first flow equalizing piece; 3231. conical part; 3232. wing plate; 3233. columnar part; 3234. circular truncated cone part; 3235. thrust bearing; 3236. shaft; 3237. rotating bearing; 33. second flow stabilizing component; 34. second flow equalizing component; 341. second flow equalizing ring; 3411. second annular groove; 3412. second O-shaped silica gel ring; 342. second support frame; 343. second flow equalizing piece; 3431. first conical body; 34311. helical drainage groove; 3432. second conical body; 34321. flow stabilizing sheet; 35. third flow stabilizing component; 36. filtering component; 37. moisture absorbing component; 38. adsorbing component; 381. fixing ring; 3811. third annular groove; 3812. first O-shaped sealing ring; 3813. stepped opening; 3814. arc-shaped sealing plate; 382. blocking net; 39. molecular sieve component; 301. stepped gap; 302. semicircular sealing plate; 303. fourth annular groove; 304. second O-shaped sealing ring; 305. annular baffle; 4. combined pipe; 5. compression pump; 6. first washing tower unit; 7. first separator; 8. second washing tower unit; 9. second separator; 10. heat exchange unit; 201. washing tower; 2011. fifth annular groove; 2012. helical protrusion; 2021. venturi mixer; 2022. mounting frame; 2023. flow guide pipe; 204. gas input pipe; 20511. flow equalizing pipe; 205111. gap; 20512. flow equalizing net plate; 20513. flow equalizing head; 205131. flow guide groove; 2052. liquid outlet pipe; 2061. mechanical defoamer; 2062. liquid storage tank; 2063. delivery pump; 3001. flow stabilizing ring; 3002. flow stabilizing net; 401. first ball valve; 402. second ball valve. DETAILED DESCRIPTION

[0097] The application will be further described below in conjunction with the drawings and examples.

[0098] Example:

[0099] As shown in the figure, the pressure vessel residual gas separation and purification equipment comprises: Figures 1 to 20

[0100] gas inlet pipe 1; ​

[0101] A booster pump 2 is arranged in the intake pipe 1;

[0102] Two treatment pipes 3 are respectively communicated with the intake pipe 1 through first ball valves 401; the treatment pipes 3 are sequentially provided with a first flow stabilizing assembly 31, a first flow equalizing assembly 32, a second flow stabilizing assembly 33, a second flow equalizing assembly 34, a third flow stabilizing assembly 35, a filtering assembly 36, a moisture absorbing assembly 37, an adsorbing assembly 38 and a molecular sieve assembly 39 along the flow direction of the natural gas;

[0103] A combination pipe 4 is in Y shape, and two branches are respectively communicated with the ends of the two treatment pipes 3 through second ball valves 402;

[0104] A compression pump 5 is arranged on the main pipe of the combination pipe 4;

[0105] A first washing tower unit 6 is communicated with the main pipe of the combination pipe 4 through the compression pump 5; the internal washing agent is an acidic washing agent, which removes hydrogen sulfide impurities;

[0106] A first separator 7 is communicated with the end of the first washing tower unit 6;

[0107] A second washing tower unit 8 is communicated with the end of the first separator 7; the internal washing agent is an alkaline washing agent, which removes carbon dioxide impurities;

[0108] A second separator 9 is communicated with the end of the second washing tower unit 8;

[0109] A heat exchange unit 10 is communicated with the end of the second separator 9;

[0110] The first flow equalizing assembly 32 comprises:

[0111] A first flow equalizing ring 321 is provided with a first annular groove 3211 on the outer cylindrical surface, and a first O-shaped silica gel ring 3212 is arranged in the first annular groove 3211; the first flow equalizing ring 321 is arranged in the treatment pipe 3;

[0112] A first support frame 322 is fixedly connected with the inner wall of the first flow equalizing ring 321;

[0113] A plurality of first flow equalizing members 323 are rotatably and uniformly distributed on the first support frame 322; the rotation axis of the first flow equalizing member 323 is parallel to the axis of the treatment pipe 3; the first flow equalizing member 323 is provided with a wing plate 3232, which is arranged at an angle with the rotation axis of the first flow equalizing member 323; the natural gas flowing through the surface of the first flow equalizing member 323 impacts the wing plate 3232, forcing the first flow equalizing member 323 to rotate;

[0114] The first washing tower unit 6 comprises:

[0115] The washing tower 201 is a closed container structure;

[0116] at least one Venturi gas-liquid mixing unit arranged in the scrubbing tower 201;

[0117] a scrubbing liquid circulating system arranged outside the scrubbing tower 201, with an inlet arranged at the bottom of the scrubbing tower 201 and an outlet in communication with the liquid inlet of the Venturi gas-liquid mixing unit;

[0118] a gas input pipeline 204, one end of which is in communication with the main pipeline, and the other end thereof is in communication with the gas inlet of the Venturi gas-liquid mixing unit through the scrubbing tower 201;

[0119] The first flow stabilizing assembly 31 is identical in structure to the second flow stabilizing assembly 33 and the third flow stabilizing assembly 35; the first flow stabilizing assembly 31 comprises:

[0120] a flow stabilizing ring 3001 arranged in the processing pipe 3;

[0121] a flow stabilizing net 3002 arranged in the flow stabilizing ring 3001.

[0122] In this embodiment, the first flow equalizing member 323 comprises:

[0123] a conical portion 3231, the tip of which points to the upstream of the natural gas; two wing plates 3232 are arranged on the conical portion 3231;

[0124] a columnar portion 3233 coaxially connected with the tail of the conical portion 3231, the diameter of the columnar portion 3233 being the same as that of the tail of the conical portion 3231;

[0125] a circular truncated cone portion 3234 arranged coaxially at the tail of the columnar portion 3233; the circular truncated cone portion 3234 and the columnar portion 3233 are provided with a through hole along their axis; a circular groove is arranged at the region opposite to the through hole of the conical portion 3231;

[0126] a thrust bearing 3235 arranged at the bottom of the circular groove;

[0127] a shaft 3236, the head end of which is located in the circular groove through the through hole and abuts against the thrust bearing 3235, and the tail end of which is fixedly connected with the first support frame 322; the axis of the shaft 3236 is parallel to the axis of the processing pipe 3;

[0128] a rotating bearing 3237 sleeved on the shaft 3236 and in contact with the inner wall of the through hole;

[0129] The area occupied by the projection of all the first flow equalizing members 323 on the axis of the processing pipe 3 is not more than one-eighth of the cross-sectional area of the inner cavity of the processing pipe 3.

[0130] The natural gas flow impacts the conical part 3231, is extruded and pressurized, and contacts the wing plate 3232, drives the conical part 3231 to rotate, so that the natural gas flowing through the conical part 3231 is dispersed, thereby realizing the dispersion of the high-speed gas flow to the remaining low-speed gas flow area, and finally realizing the effect of large atmosphere uniform flow.

[0131] Meanwhile, after passing through the conical part 3231, the natural gas is no longer extruded and pressurized by the conical part 3231, and the pressure reduction process will cause the natural gas flow to be dispersed again, and the tail part will also generate turbulence, further dispersing the uniform flow rate.

[0132] In the embodiment, the second flow uniformizing assembly 34 comprises:

[0133] A second flow uniformizing ring 341 is provided with a second annular groove 3411 on the outer cylindrical surface, and a second O-shaped silica gel ring 3412 is arranged in the second annular groove 3411; the second flow uniformizing ring 341 is arranged in the processing pipe 3;

[0134] A second support frame 342 is fixedly connected to the inner wall of the second flow uniformizing ring 341;

[0135] A plurality of second flow uniformizing members 343 are uniformly distributed on the first support frame 322; the axis of the second flow uniformizing member 343 is parallel to the axis of the processing pipe 3; the second flow uniformizing member 343 comprises:

[0136] A first conical body 3431;

[0137] A second conical body 3432 having the same bottom diameter as the first conical body 3431; the bottom of the second conical body 3432 is coaxially connected to the bottom of the first conical body 3431; the first conical body 3431 and the second conical body 3432 form a spindle shape; the connection between the first conical body 3431 and the second conical body 3432 is smoothly transitioned; the height of the second conical body 3432 is greater than the height of the first conical body 3431; the tip of the second conical body 3432 is fixedly connected to the second support frame 342;

[0138] The projection of all the second flow uniformizing members on the axis of the processing pipe 3 occupies an area not more than one-eighth of the cross-sectional area of the inner cavity of the processing pipe 3.

[0139] Through the pressurization of the first conical body 3431 and the pressure reduction of the second conical body 3432, the natural gas flow is dispersed to a certain extent, realizing the small atmosphere and small amplitude uniform flow effect.

[0140] In the embodiment, the conical surface of the first conical body 3431 is provided with a plurality of spiral guide grooves 34311, and the plurality of spiral guide grooves 34311 are uniformly and circumferentially arranged on the conical surface of the first conical body 3431 around the axis of the first conical body 3431; the width and depth of the spiral guide grooves 34311 increase with the increase of the distance from the tip of the first conical body 3431.

[0141] After the natural gas flow is extruded by the first conical body 3431, the pressure is increased, and at the same time, the gas flow flowing along the spiral guide groove will impact the nearby gas flow under the action of centrifugal force and disperse the gas flow. The guide groove can avoid the gas flowing through being completely disturbed and excessively dispersed.

[0142] The conical surface of the second conical body 3432 is provided with a plurality of flow stabilizing plates 34321, and the plate surface of the plurality of flow stabilizing plates 34321 is parallel to the axis of the second conical body 3432; the plurality of flow stabilizing plates 34321 are uniformly and circumferentially arranged on the conical surface of the second conical body 3432 around the axis of the second conical body 3432.

[0143] The second support frame 342 wraps the tip of the second conical body 3432; and the end of the flow stabilizing plate 34321 is fixedly connected with the support rod of the second support frame 342.

[0144] In the embodiment, the moisture absorbing assembly 37 comprises:

[0145] The fixed ring 381 is provided with a third annular groove 3811 on the outer cylindrical surface, and a first O-shaped sealing ring 3812 is arranged in the third annular groove 3811; the fixed ring 381 is arranged in the treatment pipe 3 and is in seamless sealing connection with the inner wall of the treatment pipe 3; the fixed ring 381 is provided with a stepped opening 3813 that is reduced inward; the stepped opening 3813 is in communication with an arc-shaped sealing plate 3814; the sealing plate is fixedly connected with the fixed ring 381 by screws;

[0146] Two pieces of blocking nets are arranged on the two side surfaces of the fixed ring 381 and are in seamless fixed connection with the end surface of the fixed ring 381; the two pieces of blocking nets and the fixed ring 381 form a hollow circular cake-shaped containing space, and the moisture absorbing particles are placed in the circular cake-shaped containing space;

[0147] The molecular sieve assembly 39 has the same structure as the moisture absorbing assembly 37, and the circular cake-shaped containing space of the molecular sieve assembly 39 is provided with molecular sieve particles.

[0148] In this embodiment, the first flow stabilizing assembly 31, the first flow equalizing assembly 32, the second flow stabilizing assembly 33, the second flow equalizing assembly 34, the third flow stabilizing assembly 35, the filtering assembly 36, the moisture absorbing assembly 37, the adsorbing assembly 38, the heat exchanging assembly, and the molecular sieve assembly 39 are provided with semicircular stepped notches 250111301; the stepped notches 250111301 are hingedly connected with semicircular sealing plates 302, the lower surfaces of the semicircular sealing plates 302 are provided with fourth annular grooves 303; the fourth annular grooves 303 are provided with second O-shaped sealing rings 304; the semicircular sealing plates 302 are sealed with the stepped notches 250111301 through bolt mechanisms; and the processing pipe 3 is provided with an annular baffle 305 downstream of the stepped notches 250111301.

[0149] In this embodiment, the Venturi gas-liquid mixing units are four, which are uniformly arranged in the washing tower 201 around the axis of the washing tower 201; the Venturi gas-liquid mixing unit comprises:

[0150] The liquid inlet of the Venturi tube mixer is communicated with the liquid outlet of the washing liquid circulating system through the liquid inlet assembly; the gas inlet is communicated with the gas input pipeline 204;

[0151] The mounting frame 2022 is fixedly connected with the Venturi tube mixer at one end and fixedly connected with the inner wall of the washing tower 201 at the other end; the inner wall of the washing tower 201 is provided with a fifth annular groove 2011 with an inner groove; and the liquid outlet of the Venturi tube mixer is flush with the fifth annular groove 2011.

[0152] The flow guide pipe 2023 is seamlessly communicated with the liquid outlet of the Venturi tube mixer at one end and points to the fifth annular groove 2011 at the other end; the flow guide pipe 2023 smoothly guides the flow; and the included angle between the axis of the liquid outlet flow of the flow guide pipe 2023 and the tangent line at the intersection of the flow guide pipe 2023 and the fifth annular groove 2011 is less than 30 degrees.

[0153] The diameter of the natural gas bubbles can be controlled through the Venturi tube structure, and the bubble diameter can be adjusted according to the impurity content of the natural gas to achieve efficient and high-quality treatment.

[0154] The fifth annular groove 2011 can reduce the impact, reduce the speed of natural gas bubble rupture, and reduce the noise.

[0155] In this embodiment, the inner wall of the washing tower 201 is provided with a spiral protrusion 2012, which is located below the fifth annular groove 2011; the cross section of the spiral protrusion 2012 is semicircular; and the upper surface and the lower surface of the spiral protrusion 2012 are smoothly transitioned with the inner wall of the washing tower 201.

[0156] The helical protrusion 2012 can prolong the falling time of the absorbent of the mixed natural gas, increase the reaction absorption time, and promote the discharge of part of the natural gas from the absorbent, so as to achieve the purpose of defoaming to a certain extent.

[0157] In the embodiment, the liquid inlet assembly comprises:

[0158] The liquid inlet flow distributor is arranged in the washing tower 201, located on the axis of the washing tower 201, and located obliquely below the Venturi tube mixer, and the lower end is in communication with the liquid outlet of the washing liquid circulating system;

[0159] The four liquid outlet pipes 2052 are in communication at one end with the upper end of the liquid inlet flow distributor and at the other end with the liquid inlet of the Venturi tube mixer;

[0160] The liquid inlet flow distributor comprises:

[0161] The flow distributor pipe 20511 is vertically arranged, and the lower end is in communication with the liquid outlet of the washing liquid circulating system; the top end of the flow distributor pipe 20511 is uniformly circumferentially arranged with four notches 250111;

[0162] The flow distributor net plate 20512 is arranged in the flow distributor pipe 20511;

[0163] The flow distributor head 20513 is arranged at the top of the flow distributor pipe 20511 and is conical; the upper end surface of the flow distributor head 20513 is seamlessly connected with the upper end surface of the flow distributor pipe 20511; the flow distributor head 20513 and the four notches 250111 of the flow distributor pipe 20511 form four liquid outlet holes, and the four liquid outlet holes are respectively in communication with the four liquid outlet pipes 2052; the flow distributor head 20513 is provided with flow guide grooves 205131 corresponding to the four notches 250111, and the flow guide grooves 205131 uniformly enlarge from the top point to the bottom edge.

[0164] Through the structural design of the flow distributor head 20513, the flow distributor net plate 20512 and the like, the liquid flow rate and pressure flowing to each flow distributor pipe 20511 can be substantially the same, so that the treatment of natural gas can be ensured to be stable and uniform.

[0165] In the embodiment, the washing liquid circulating system comprises:

[0166] The mechanical defoamer 2061 is in communication at the liquid inlet end with the bottom of the washing tower 201 and in communication at the gas outlet end with the upper part of the washing tower 201;

[0167] The liquid storage tank 2062 is in communication with the liquid outlet of the mechanical defoamer 2061, and the top and the bottom are respectively provided with a liquid inlet and a liquid discharge port;

[0168] The delivery pump 2063 is in communication at the liquid inlet end with the bottom of the liquid storage tank and in communication at the liquid outlet end with the Venturi gas-liquid mixing unit;

[0169] The second washing tower unit 8 is the same structure as the first washing tower unit 6; the washing agent in the first washing tower unit 6 is an acidic chemical agent; and the washing agent in the second washing tower unit 8 is an alkaline chemical agent.

[0170] The pressure vessel residual gas separation and purification equipment in the embodiment is used as follows: the natural gas collected from the low-temperature gas in the pressure vessel is sent to a certain treatment pipe 3 through a booster pump 2 and a first ball valve 401, is stabilized in turn, is uniformly distributed in a large range through a first uniform flow assembly 32, is stabilized again, is uniformly distributed in a small range through a second uniform flow assembly 34, and forms a gas flow with uniform flow rates at all places, which is respectively contacted with a moisture absorption assembly 37 (moisture absorption particles), an adsorption assembly 38 (activated carbon), and a molecular sieve assembly 39 (specific impurity gas adsorption) for treatment. When the gas flow with uniform flow rates at all places is contacted with each treatment assembly, the treatment capacity of each region of each assembly can be synchronously reduced, and the centralized gas flow region will not be rapidly disabled, thereby ensuring that the treatment is up to standard.

[0171] The natural gas treated by each unit is sent to the first washing tower unit 6, is treated by an acidic washing agent, is sent to a first separator 7 to remove other gases generated after the acid washing, is sent to the second washing tower unit 8 to be treated by an alkaline washing agent, is sent to a second separator 9, and is finally sent to a heat exchange unit 10 to be warmed up and then sent to a compression and liquefaction link for liquefaction treatment.

[0172] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application and are not limiting. Although the present application has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present application can be modified or replaced by equivalents without departing from the purpose and scope of the technical solutions, and all of them should be covered in the scope of the claims of the present application.

Claims

1. A pressure vessel residual gas separation and purification device, characterized in that, include: Intake pipe; The booster pump is located inside the air intake pipe; Two processing pipes are connected to the inlet pipe via a first ball valve; the processing pipes are sequentially equipped with a first flow stabilizing component, a first flow equalizing component, a second flow stabilizing component, a second flow equalizing component, a third flow stabilizing component, a filter component, a moisture absorption component, an adsorption component, and a molecular sieve component along the natural gas flow direction. The pipe is combined into a Y-shape, with the two branches connected to the ends of the two processing pipes via a second ball valve; A compression pump is installed on the main pipe of the combined pipeline; The first washing tower unit is connected to the main pipe of the combined pipeline via a compression pump; The first separator is connected to the end of the first washing tower unit; The second washing tower unit is connected to the end of the first separator; The second separator is connected to the end of the second washing tower unit; The heat exchange unit is connected to the end of the second separator; The first flow sharing component includes: The first flow equalization ring has a first annular groove on its outer cylindrical surface, and a first O-ring silicone ring is provided inside the first annular groove; the first flow equalization ring is disposed inside the processing tube. The first support frame is fixedly connected to the inner wall of the first flow equalization ring; Several first flow equalization components are rotatably and evenly distributed on a first support frame; the rotation axis of the first flow equalization component is parallel to the axis of the processing pipe; the first flow equalization component is provided with a wing plate, which is set at an angle to the rotation axis of the first flow equalization component; the natural gas flowing through the surface of the first flow equalization component impacts the wing plate, forcing the first flow equalization component to rotate. The first scrubbing tower unit includes: A scrubbing tower is a closed container structure. At least one Venturi gas-liquid mixing unit is installed inside the scrubbing tower; The washing liquid circulation system is located outside the washing tower, with the inlet located at the bottom of the washing tower and the outlet connected to the inlet of the Venturi gas-liquid mixing unit. The gas input pipeline is connected to the main pipe at one end and to the gas inlet of the Venturi gas-liquid mixing unit at the other end through the scrubbing tower. The first current stabilizing component has the same structure as the second and third current stabilizing components; the first current stabilizing component includes: A flow stabilizing ring is installed inside the processing pipe; The current stabilization network is installed inside the current stabilization ring; The Venturi gas-liquid mixing unit comprises four units, which are evenly arranged in a circular array around the axis of the scrubbing tower within the scrubbing tower; the Venturi gas-liquid mixing unit includes: The Venturi mixer has a liquid inlet connected to the liquid outlet of the washing liquid circulation system via a liquid inlet assembly; and an air inlet connected to a gas input pipeline. The mounting bracket is fixed at one end to the Venturi mixer and at the other end to the inner wall of the washing tower; the inner wall of the washing tower is provided with a fifth annular groove with an inner groove; the liquid outlet of the Venturi mixer is flush with the fifth annular groove. A flow guide tube, one end of which is seamlessly connected to the outlet of the Venturi mixer, and the other end which points to the fifth annular groove, the flow guide tube smoothly guides the flow; the angle between the axis of the flow outlet of the flow guide tube and the tangent at the intersection with the fifth annular groove is less than 30 degrees; The liquid inlet assembly includes: The liquid flow equalizer is installed in the washing tower, located on the axis of the washing tower, and diagonally below the Venturi mixer. Its lower end is connected to the liquid outlet of the washing liquid circulation system. Four outlet pipes, one end of which is connected to the upper end of the liquid equalizer, and the other end of which is connected to the liquid inlet of the Venturi tube mixer; The inlet flow equalizer includes: The flow equalization tube is vertically arranged, with its lower end connected to the outlet of the washing liquid circulation system; the top of the flow equalization tube has four notches arranged in a uniform circumferential array around its axis. A flow equalization grid is installed inside the flow equalization pipe; A flow equalization head is located at the top of the flow equalization tube and is shaped like a cone. The upper end face of the flow equalization head is seamlessly connected to the upper end face of the flow equalization tube. The flow equalization head and the four notches of the flow equalization tube form four liquid outlet holes, which are respectively connected to four liquid outlet tubes. The flow equalization head is provided with flow guiding grooves corresponding to the four notches, and the flow guiding grooves are uniformly enlarged from their apex to their bottom edge.

2. The pressure vessel residual gas separation and purification equipment according to claim 1, characterized in that, The first flow equalization element includes: The cone-shaped section has its tip pointing upstream of the natural gas; two of the aforementioned wing plates are stacked on the cone-shaped section. The cylindrical part is coaxially connected to the tail of the tapered part, and the diameter of the cylindrical part is the same as the diameter of the tail of the tapered part; The frustum portion is coaxially positioned at the tail of the cylindrical portion; the frustum portion and the cylindrical portion have through holes along their axes; the conical portion has a circular groove in the area directly opposite the through holes; The thrust bearing is located at the bottom of the circular groove; The shaft has its head end passing through a through hole and located in a circular groove, abutting against a thrust bearing; its tail end is fixedly connected to the first support frame; the axis of the shaft is parallel to the axis of the processing tube. The rotating bearing is sleeved on the shaft and contacts the inner wall of the perforation. The area occupied by all the first flow equalization elements projected on the axis of the processing tube does not exceed one-eighth of the cross-sectional area of ​​the inner cavity of the processing tube.

3. The pressure vessel residual gas separation and purification equipment according to claim 1, wherein the second flow equalization component comprises: The second flow equalization ring has a second annular groove on its outer cylindrical surface, and a second O-ring silicone ring is provided inside the second annular groove. The second flow equalization ring is disposed inside the processing pipe; The second support frame is fixedly connected to the inner wall of the second flow equalization ring; Several second flow equalization components are evenly distributed on the first support frame; The axis of the second flow equalization element is parallel to the axis of the processing tube; The second flow equalization element includes: First cone-shaped body; The second cone has the same bottom diameter as the first cone; the bottom of the second cone is coaxially connected to the bottom of the first cone; the first and second cones are spindle-shaped; the connection between the first and second cones is smooth; the height of the second cone is greater than the height of the first cone; the tip of the second cone is fixedly connected to the second support frame. The area occupied by the projection of all two flow equalizers on the axis of the processing tube does not exceed one-eighth of the cross-sectional area of ​​the inner cavity of the processing tube.

4. The pressure vessel residual gas separation and purification equipment according to claim 3, characterized in that, The first cone has a plurality of spiral drainage grooves on its conical surface, and the plurality of spiral drainage grooves are distributed in a uniform circumferential array around the axis of the first cone on the conical surface of the first cone; the width and depth of the spiral drainage grooves increase as the distance from the tip of the first cone increases; The second cone has a plurality of current stabilizing plates on its conical surface, and the plates of the plurality of current stabilizing plates are parallel to the axis of the second cone; the plurality of current stabilizing plates are evenly distributed in a circular array around the axis of the second cone on its conical surface; The second support frame wraps around the tip of the second cone; the end of the flow stabilizer is fixedly connected to the support rod of the second support frame.

5. The pressure vessel residual gas separation and purification equipment according to claim 1, characterized in that, The moisture-absorbing component includes: A fixing ring has a third annular groove on its outer cylindrical surface, and a first O-ring seal is provided inside the third annular groove; the fixing ring is set inside the processing tube and is seamlessly sealed to the inner wall of the processing tube; the fixing ring has an inwardly narrowing stepped opening; an arc-shaped sealing plate is connected to the stepped opening; the sealing plate is fixed to the fixing ring by screws; Two mesh panels are set on both sides of the fixed ring and are seamlessly fixed to the end face of the fixed ring; the two mesh panels and the fixed ring form a hollow disc-shaped receiving space, and moisture-absorbing particles are placed in the disc-shaped receiving space; The molecular sieve assembly has the same structure as the moisture-absorbing assembly, and the disc-shaped accommodating space of the molecular sieve assembly prevents molecular sieve particles from entering.

6. The pressure vessel residual gas separation and purification equipment according to claim 1, characterized in that, The processing tube is equipped with a first flow stabilizing component, a first flow equalizing component, a second flow stabilizing component, a second flow equalizing component, a third flow stabilizing component, a filtration component, a moisture absorption component, an adsorption component, a heat exchange component, and a molecular sieve component, each with a semi-circular, reduced-size stepped notch. A semi-circular sealing plate is hinged to the stepped notch, and the lower surface of the semi-circular sealing plate has a fourth annular groove. A second O-ring is provided in the fourth annular groove. The semi-circular sealing plate is sealed to the stepped notch by a bolt mechanism. An annular baffle is provided downstream of the stepped notch inside the processing tube.

7. The pressure vessel residual gas separation and purification equipment according to claim 1, characterized in that, The inner wall of the washing tower is provided with a spiral protrusion, which is located below the fifth annular groove; the cross-section of the spiral protrusion is semi-circular; the upper and lower surfaces of the spiral protrusion smoothly transition with the inner wall of the washing tower.

8. The pressure vessel residual gas separation and purification equipment according to claim 1, characterized in that, The detergent circulation system includes: The mechanical defoamer has its liquid inlet connected to the bottom of the washing tower and its air outlet connected to the top of the washing tower. The liquid storage tank is connected to the liquid outlet of the mechanical defoamer, and has a liquid inlet and a liquid outlet at the top and bottom, respectively. The delivery pump has its inlet end connected to the bottom of the storage pipe and its outlet end connected to the Venturi gas-liquid mixing unit. The second washing tower unit has the same structure as the first washing tower unit; the detergent in the first washing tower unit is an acidic chemical agent; the detergent in the second washing tower unit is an alkaline chemical agent.

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