Jet device and triethylene glycol dehydration regeneration tail gas treatment system

Abstract

The utility model relates to an injection device and triethylene glycol dehydration regeneration tail gas treatment system, belongs to the technical field of natural gas equipment, and comprises at least two stages of injectors, each injector comprises an injection inlet used for inputting injection gas, a suction inlet used for sucking tail gas and a mixing outlet, the injection inlet corresponds to the mixing outlet, and the suction inlet corresponds to the mixing outlet. A throttling runner is at least constructed between the injection inlet and the mixing outlet; the mixing outlet of the upper-stage ejector is communicated with the suction inlet of the lower-stage ejector, and the ejectors at all stages are sequentially connected in series into a whole; according to the injection device, tail gas can be injected and pressurized in a tail gas recovery system, so that a compressor is not needed, a firing furnace structure can be omitted, and the operation and maintenance cost can be greatly saved; and the pressure of the injected and pressurized mixed gas can reach a preset value more accurately and efficiently, so that the mixed gas can be smoothly input into a natural gas pipeline network, the requirements of different processes can be met, and the universality is higher.

Description

Technical Field

[0001] This utility model relates to the field of natural gas equipment technology, specifically to an injection device and a triethylene glycol dehydration and regeneration tail gas treatment system. Background Technology

[0002] Natural gas dehydration is a crucial pretreatment process for natural gas. Untreated natural gas extracted from formations may contain saturated water, free water, and liquid heavy hydrocarbons (wet natural gas), thus requiring dehydration during production and transportation. Natural gas dehydration processes can be categorized by principle into cryogenic separation, solvent absorption, solid adsorption, and membrane separation. Solvent absorption processes include those using ethylene glycol (EG), diethylene glycol (DEG), and triethylene glycol (TEG). In numerous gas field production and processing operations, triethylene glycol (TEG) dehydration technology is widely used due to its advantages such as easy regeneration and good thermal stability.

[0003] Traditional natural gas dehydration systems typically include multiple distillation columns (or rectifier columns). The tail gas from the TEG distillation column is usually sent directly to a combustion tower for combustion treatment, while the tail gas from the low-pressure distillation column is typically compressed in multiple stages by a compressor before being sent to the original high-pressure natural gas pipeline network. This process not only consumes more natural gas but also incurs high investment and operating costs for the compression equipment. To overcome these shortcomings, existing technologies disclose several tail gas treatment systems for the triethylene glycol (TEG) dehydration and regeneration process. These systems utilize a combination of coolers, gas-liquid separators, and ejectors to treat the TEG distillation column tail gas. Examples include a TEG distillation column tail gas recovery system disclosed in Chinese Patent CN 221107589 U and a skid-mounted tail gas recovery device disclosed in Chinese Patent CN221085163 U. Compared to traditional multi-stage compression distillation column recovery methods, these systems use ejectors for pressurization during tail gas recovery, eliminating the need for compressors and the combustion furnace structure, thus significantly reducing operating and maintenance costs. In practice, it is necessary not only to use the ejector to increase the pressure of the exhaust gas, but also to ensure that the pressure of the mixed gas output from the ejector can reach the preset value. Otherwise, the mixed gas cannot be smoothly input into the downstream compressor (compressor in the natural gas pipeline network). However, the existing ejectors are difficult to meet this requirement and urgently need to be solved. Summary of the Invention

[0004] The first aspect of this utility model addresses the aforementioned technical problem by providing an injection device equipped with at least two stages of injectors. This device not only pressurizes exhaust gas in the exhaust gas recovery system but also facilitates control and adjustment of the exhaust gas pressure, ensuring that the pressure of the output mixed gas reaches a preset value for smooth input to the downstream compressor. The main concept is as follows:

[0005] An injection device includes at least two stages of injectors. Each injector includes an ejector inlet for inputting ejector gas, an intake inlet for inhaling exhaust gas, and a mixing outlet. The ejector inlet, intake inlet, and mixing outlet are interconnected. The ejector inlet corresponds to the mixing outlet. At least one throttling channel is constructed between the ejector inlet and the mixing outlet. The mixing outlet of the previous stage injector is connected to the intake inlet of the next stage injector. Each stage of injectors is connected in series to form a whole. In this solution, by configuring a throttling channel between the ejector inlet and the mixing outlet of the ejector, the ejector gas can be used to pressurize the exhaust gas to be treated without directly consuming mechanical energy. Furthermore, the on-site natural gas can be fully utilized as the ejector gas, which is very convenient. By configuring at least two stages of ejectors and connecting the mixing outlet of the previous stage ejector to the inlet of the next stage ejector, the pressure of the exhaust gas can be increased step by step through the ejector gas. This ensures that the mixed gas output from the final stage ejector can smoothly reach the required preset pressure value for subsequent input to the downstream compressor. It also facilitates control of the output mixed gas pressure, resulting in better and more precise pressurization. On-site commissioning is also easier, and higher pressure levels can be achieved through multi-stage continuous ejector pressurization, thus meeting the needs of different processes and significantly improving versatility. Connecting the ejectors in series makes on-site assembly and subsequent maintenance very convenient.

[0006] Furthermore, the injector includes a main body, a nozzle, and a mixing tube. The main body has an intake chamber for drawing in exhaust gas, an intake port connected to the intake chamber, a first opening, and a second opening, with the first opening directly opposite the second opening. The ejector inlet is located at one end of the nozzle, and the other end of the nozzle has an ejection port. A throttling channel is constructed inside the nozzle, and the ejector inlet and the ejection port are connected through the throttling channel. The end of the nozzle with the ejection port is inserted into the intake chamber through the first opening and directly opposite the second opening, and the nozzle is connected to the intake chamber. One end of the mixing tube is connected to the main body and communicates with the second opening. The mixing outlet is located at the other end of the mixing tube, and the mixing tube has a throttling channel. The second opening is connected to the mixing outlet through the throttling channel. By aligning the first opening directly with the second opening, the nozzle and the mixing tube are positioned respectively through the first and second openings, making the nozzle more directly aligned with the mixing tube. Simultaneously, throttling channels are configured in both the nozzle and the mixing tube, with the two ends of the throttling channels directly opposite each other, thereby achieving a better ejector pressurization effect and controllable pressure.

[0007] Preferably, the nozzle's injection port is inserted into the second opening, the inner diameter of the second opening being larger than the outer diameter of the injection port, and there is a gap between the nozzle and the sidewall of the second opening. This allows for the intake of exhaust gas, resulting in a better pressurization effect on the exhaust gas.

[0008] Preferably, the throttling channel includes a contraction section, a throttling section connected to the contraction section, and a diffusion section connected to the throttling section. The inner diameter of the contraction section gradually increases in the direction away from the throttling section, and the inner diameter of the diffusion section gradually increases in the direction away from the throttling section.

[0009] Preferably, the nozzle is further configured with a flow stabilizing channel, which is a direct current channel. One end of the flow stabilizing channel is connected to the injection inlet, and the other end is connected to the contraction section in the throttling channel. The diffusion section is connected to the injection port.

[0010] Preferably, within the mixing tube, a converging section extends through the end of the mixing tube opposite to the mixing outlet, forming the mixing inlet. The mixing inlet is directly opposite the second opening, and its inner diameter is larger than the outer diameter of the injection port. The diffuser section is connected to the mixing outlet. This creates a gap between the mixing inlet and the nozzle for the exhaust gas to pass through. Simultaneously, the nozzle and the mixing tube are coaxial, ensuring that this gap is evenly distributed along the circumference of the nozzle. This facilitates more thorough and uniform mixing and energy exchange between the ejector gas and the exhaust gas, and also contributes to a better pressurization effect.

[0011] Preferably, the mixing outlet of the upper-stage injector is connected to the inlet of the lower-stage injector via a connecting pipe. This connecting pipe includes a straight section and a curved section. One end of the straight section is connected to the body of the lower-stage injector and communicates with its inlet. The other end of the straight section is connected to the curved section, which in turn connects to and communicates with the mixing pipe. The straight section is perpendicular to the mixing pipe. This allows the injectors at each stage to be arranged parallel to each other, and the injection inlets of each injector can be located on the same side of the entire injection device, thus facilitating on-site assembly.

[0012] Preferably, the inner diameter of the connecting pipe is the same as the inner diameter of the mixing outlet. This helps reduce pressure loss, thus making it easier to control the pressurization effect.

[0013] Preferably, the mixing pipe and the connecting pipe are integrally formed components.

[0014] Preferably, it includes two or three injectors connected in series.

[0015] Preferably, the size of the mixing tube in the upper-stage injector is smaller than the size of the mixing tube in the lower-stage injector; the size of the nozzle in the upper-stage injector is smaller than the size of the nozzle in the lower-stage injector. This is beneficial for achieving a better and more precise pressurization effect.

[0016] The second aspect of this invention addresses the problem of more easily and efficiently ensuring precise alignment between the nozzle and the mixing tube. Further, the outer side of the main body of the injector is constructed with a recessed hole, and a first opening communicates with the recessed hole, with the first opening and the recessed hole being coaxial. At least two threaded holes are also constructed along the circumferential direction of the recessed hole. The outer diameter of the nozzle is configured to fit the first opening, and the end of the nozzle is also constructed with a head that adapts to the recessed hole. The nozzle is inserted into the main body through the first opening, and the head of the nozzle is engaged within the recessed hole. The invention also includes a cover component, which has a flow channel adapted to the nozzle, extending through both ends of the cover component. One end of the cover component has a flange, and the flange has at least two through holes along the circumferential direction of the flow channel that adapt to each threaded hole. The cover component is detachably connected to the main body via fasteners that adapt to the threaded holes, pressing the head of the nozzle against the main body. The flow channel is connected to and aligned with the injection inlet. This design offers several advantages. First, it allows for the detachable installation of the nozzle, enabling the assembly and replacement of nozzles of different models or sizes to adjust the pressure of the output mixed gas and meet process requirements or achieve better injection pressurization. It also securely fixes the nozzle to the main body. Second, high-precision machining ensures strict alignment between the first and second openings. The first opening guides the nozzle during assembly and provides a limiting constraint. The cooperation between the first opening and the nozzle ensures strict alignment between the nozzle and the mixing tube, improving installation accuracy and allowing assemblers to more easily and efficiently achieve this alignment, thus contributing to a better and more precise pressurization effect.

[0017] Furthermore, a first sealing ring is provided between the nozzle head and the bottom of the sinkhole; a second sealing ring is provided between the nozzle head and the cover component. The first and second sealing rings can be tightened by the tightening of fasteners, thereby achieving a two-stage sealing effect, ensuring the sealing of the entire intake chamber, and achieving a better pressurization effect.

[0018] Preferably, the inner diameter of the flow channel is the same as that of the steady flow channel to effectively reduce pressure loss.

[0019] Furthermore, a positioning cylinder is also provided inside the intake chamber of the main body. One end of the positioning cylinder is connected to the inner wall of the intake chamber. The inner diameter of the positioning cylinder is equal to the inner diameter of the first opening, and the positioning cylinder is coaxial with the first opening. During assembly, the nozzle is sequentially inserted into the main body along the first opening and the positioning cylinder, and is simultaneously constrained by the first opening and the positioning cylinder. This allows for better installation accuracy of the nozzle through the cooperation between the nozzle, the first opening, and the positioning cylinder, ensuring that the nozzle is strictly aligned with the mixing tube, thereby facilitating a better and more precise pressurization effect.

[0020] The third aspect of this utility model provides a triethylene glycol dehydration and regeneration tail gas treatment system, including a gas-liquid separator and the injection device. The gas-liquid separator is equipped with an inlet for inputting tail gas, a gas phase outlet, and a liquid phase outlet. The gas phase outlet is connected to the inlet of the first-stage injector in the injection device via a tail gas pipeline. The system also includes a main pipeline for conveying ejector gas and at least two branch pipelines connected to the main pipeline. Each branch pipeline is connected to an ejector inlet at each stage of the injection device, and each branch pipeline is equipped with a valve. This allows for individual control of the on / off state of each branch pipeline and facilitates control over the timing of their on / off states. This not only makes it easier to control and adjust the pressure of the mixed gas output from the injection device but also allows for faster and more efficient attainment of the required pressure for the mixed gas output from the injection device.

[0021] Furthermore, it also includes a pressure-replenishing pipeline, through which the main pipeline is connected to the gas-liquid separator, and a first pressure relief valve is also installed on the pressure-replenishing pipeline.

[0022] Furthermore, it also includes a venting pipe with one end connected to the exhaust gas pipeline and the other end connected to the flare. A second pressure relief valve is installed on the venting pipe.

[0023] Furthermore, it also includes a triethylene glycol dehydration unit and a triethylene glycol regeneration unit connected to the triethylene glycol dehydration unit. The triethylene glycol regeneration unit is connected to the inlet of the gas-liquid separator via a pipeline.

[0024] Compared with the prior art, the injection device and triethylene glycol dehydration and regeneration tail gas treatment system provided by this utility model can not only inject and pressurize the tail gas in the tail gas recovery system, thus eliminating the need for a compressor and eliminating the need for a burner structure, thereby greatly saving operating and maintenance costs; but also ensure that the pressure of the mixed gas after injection and pressurization can reach the preset value more accurately and efficiently, so as to smoothly input it into the downstream natural gas pipeline network. Attached Figure Description

[0025] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a schematic diagram of a two-stage injection device provided in Embodiment 1 of this utility model.

[0027] Figure 2 This is a schematic diagram of a three-stage injection device provided in Embodiment 1 of this utility model.

[0028] Figure 3 This is a partial cross-sectional view of a two-stage spraying device provided in Embodiment 2 of this utility model.

[0029] Figure 4 This is a schematic diagram of the structure of a triethylene glycol dehydration and regeneration tail gas treatment system provided in Embodiment 3 of this utility model.

[0030] Explanation of markings in the diagram: Injection device 1, primary injector (injector) 11, secondary injector 12, tertiary injector 13; Main body 2, intake chamber 21, intake port 22, first opening 23, second opening 24, first connector 25, countersunk hole 26, threaded hole 27, positioning cylinder 28; Nozzle 3, ejector inlet 31, flow stabilizing channel 32, contraction section 33, throttling section 34, diffuser section 35, injection port 36, head 37; Mixing pipe 4, mixing inlet 41, mixing outlet 42, etc. 43. Connecting pipe 5, bend section 51, straight section 52; cover component 6, flow channel 61, flange 62, protrusion 64, third connector 65; pipe 7, fastener 71, first sealing ring 72, second sealing ring 73; gas-liquid separator 8, cooler 81, refrigeration unit 82, demister 83, drain pump 84, pressure replenishing pipe 85, venting pipe 86, exhaust pipe 87, first pressure relief valve 88, second pressure relief valve 89; main pipe 9, branch pipe 91, valve 92. Detailed Implementation

[0031] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0032] Example 1

[0033] This embodiment provides an injection device, including at least two interconnected injectors. Each injector includes an injection inlet 31 for inputting high-pressure ejector gas (hereinafter referred to as high-pressure gas or ejector gas, such as high-pressure natural gas), an intake inlet 22 for inhaling low-pressure gas (such as the exhaust gas generated in the dehydration and regeneration process of triethylene glycol), and a mixing outlet 42. The pressure of the ejector gas is higher than that of the exhaust gas. Through the injector, the ejector gas and the exhaust gas can mix with each other, exchange energy, and form a mixed gas. The mixed gas is discharged through the mixing outlet 42, thereby increasing the pressure of the exhaust gas without directly consuming mechanical energy.

[0034] Specifically, such as Figure 1 and Figure 2 As shown, the injector includes a main body 2, a nozzle 3, and a mixing tube 4. The main body 2 is configured with an intake chamber 21 for inhaling exhaust gas, an intake port 22 connected to the intake chamber 21, a first opening 23, and a second opening 24, as shown. Figure 1 and Figure 2 As shown, in practice, the first opening 23 is preferably aligned with the second opening 24, and the first opening 23 and the second opening 24 are preferably round holes. The inner diameter of the first opening 23 is configured to match the outer diameter of the nozzle 3.

[0035] like Figure 1 and Figure 2 As shown, the ejector inlet 31 is constructed at one end of the nozzle 3, and the other end of the nozzle 3 is the injection port 36. The nozzle 3 contains a flow stabilizing channel 32 and a throttling channel. The throttling channel includes a contraction section 33, a throttling section 34 connected to the contraction section 33, and a diffuser section 35 connected to the throttling section 34. Figure 1 and Figure 2 As shown, one end of the steady flow channel 32 is connected to the ejector inlet 31, and the other end is connected to the contraction section 33. The diffuser section 35 is connected to the jet nozzle 36. Along the direction from the ejector inlet 31 to the jet nozzle 36, the inner diameter of the contraction section 33 gradually decreases, and the inner diameter of the diffuser section 35 gradually increases, which is beneficial to achieving a better jetting effect. In implementation, the steady flow channel 32 can preferably be a straight-flow channel, such as... Figure 1 and Figure 2 As shown, this is to effectively reduce pressure drop; the inner diameter of the throttling section 34 can remain unchanged, and the inner diameter of the throttling section 34 is smaller than the inner diameter of the ejector inlet 31 and the injection port 36, as shown. Figure 1 and Figure 2 As shown.

[0036] During assembly, the nozzle 3 can be inserted into the suction chamber 21 through the first opening 23, while the ejector inlet 31 of the nozzle 3 remains outside the suction chamber 21 to connect to an external pipe for conveying high-pressure ejector gas. In one embodiment, the nozzle orifice 36 can be located inside the suction chamber 21 and directly opposite the second opening 24, with the nozzle 3 communicating with the suction chamber 21. In another embodiment, the nozzle orifice 36 can be inserted into the second opening 24 after passing through the suction chamber 21, and the nozzle 3 can be coaxial with the second opening 24. In practice, the inner diameter of the second opening 24 is larger than the outer diameter of the nozzle orifice 36. Figure 1 and Figure 2 As shown, a gap is formed between the nozzle 3 and the sidewall of the second opening 24 to allow exhaust gas to be drawn in and to improve the pressurization effect of the exhaust gas. In this embodiment, the nozzle 3 can be sealed and welded to the main body 2.

[0037] During implementation, one end of the mixing pipe 4 is connected to the main body 2 and communicates with the second opening 24, such as... Figure 1 and Figure 2 As shown, the mixing pipe 4 is preferably a straight pipe, and the mixing pipe 4 is coaxial with the second opening 24, thereby making the nozzle 3 coaxial with the mixing pipe 4, which can effectively reduce pressure loss and achieve a better pressurization effect. The mixing pipe 4 has a throttling channel constructed inside, which includes a contraction section 33, a throttling section 34 connected to the contraction section 33, and a diffuser section 35 connected to the throttling section 34, as shown... Figure 1 and Figure 2 As shown, the contraction section 33 passes through the end of the mixing pipe 4 away from the mixing outlet 42 and forms the mixing inlet 41. The diffuser section 35 is connected to the mixing outlet 42. The inner diameter of the throttling section 34 can remain unchanged. The inner diameter of the throttling section 34 is smaller than the inner diameter of the mixing inlet 41 and the inner diameter of the mixing outlet 42. Along the direction from the mixing inlet 41 to the mixing outlet 42, the inner diameter of the contraction section 33 gradually decreases and the inner diameter of the diffuser section 35 gradually increases, which is conducive to achieving a better pressurization effect.

[0038] In practice, the inner diameter of the mixing inlet 41 is larger than the outer diameter of the injection port 36, and it is aligned with the second opening 24, creating a gap between the mixing inlet 41 and the nozzle 3 for the exhaust gas to pass through. Figure 1 and Figure 2 As shown, since the nozzle 3 and the mixing tube 4 are coaxial, the gap is evenly distributed along the circumference of the nozzle 3, which is conducive to more complete and uniform mixing and energy exchange between the high-pressure ejector gas and the exhaust gas, and also conducive to achieving a better pressurization effect.

[0039] It is understood that, in implementation, the contraction section 33 may include a single flow channel or multiple connected flow channels, and the diffusion section 35 may also include a single flow channel or multiple connected flow channels. In this embodiment, by configuring two throttling flow channels within the ejector, and ensuring that the two throttling flow channels are coaxial, it is beneficial to achieve better ejection and pressurization effects.

[0040] In implementation, the mixing outlet 42 of the upper-stage injector 11 is connected to the inlet 22 of the lower-stage injector 11, thereby connecting the injectors in series to progressively increase the pressure of the exhaust gas through high-pressure ejector gas, ensuring that the mixed gas output from the final injector reaches the required pressure. In implementation, the mixing outlet 42 of the upper-stage injector 11 can be connected to the inlet 22 of the lower-stage injector 11 via a connecting pipe 5. To achieve better pressurization, the connecting pipe 5 includes a straight section 52 and a bent section 51. One end of the straight section 52 is connected to the body 2 of the lower-stage injector 11 and to the inlet 22, while the other end is connected to the bent section 51. The bent section 51 is connected to the mixing pipe 4 and is in communication with the mixing pipe 4. During implementation, the inner diameter of the connecting pipe 5 can preferably be the same as the inner diameter of the mixing outlet 42. That is, the inner diameter of the straight pipe section 52, the inner diameter of the bend section 51, and the inner diameter of the mixing outlet 42 are the same, which helps to reduce pressure loss and thus makes it easier to control the pressurization effect.

[0041] During implementation, the straight pipe section 52 should preferably be perpendicular to the mixing pipe 4, such as... Figure 1 and Figure 2 As shown, this allows the injectors of each stage to be arranged in parallel to each other, and the injection inlet 31 of each stage of the injector can be located on the same side of the entire injection device 1, which makes it easier to assemble on site.

[0042] In practice, the mixing pipe 4 can be welded to the body 2 of the injector. The mixing pipe 4 and the connecting pipe 5 can be integrally formed components. The connecting pipe 5 can be welded to the body 2 of the injector, so that the entire injection device 1 forms a whole.

[0043] In practical use, the ejector inlets 31 of each stage of the injector can be connected to the same high-pressure ejector gas source via pipelines, such as... Figure 1 and Figure 2 As shown, the exhaust gas is sequentially ejected through the same high-pressure ejector gas source, so that the exhaust gas reaches the pressure required for the process via this injection device 1. Of course, in practice, the ejector inlets 31 of each stage of the injector can also be connected to different high-pressure ejector gas sources through pipelines, depending on the actual situation. Examples will not be given here.

[0044] In implementation, the number of stages of the spraying device 1 can be determined according to actual needs. For example, in one embodiment, the spraying device 1 includes two sprayers connected in series, such as... Figure 1 As shown, this is to form a two-stage jet, wherein the mixing pipe 4 of the upper-stage jet 11 (which can be called the first-stage jet 11) is connected to the connecting pipe 5, and the connecting pipe 5 is connected to the main body 2 of the lower-stage jet 11 (which can be called the second-stage jet 12) and is connected to the suction port 22, so that the two-stage jets can be connected through the connecting pipe 5 and integrated into one unit, as shown. Figure 1 As shown.

[0045] For example, in another embodiment, the spraying device 1 includes three sprayers connected in series, such as... Figure 2 As shown, the mixing pipe 4 of the first-stage injector 11 is connected to the first connecting pipe 5, which in turn is connected to the body 2 of the second-stage injector 12 and communicates with the suction port 22 of the second-stage injector 12. Simultaneously, the mixing pipe 4 of the second-stage injector 12 is connected to the second connecting pipe 5, which in turn is connected to the body 2 of the third-stage injector 13 and communicates with the suction port 22 of the third-stage injector 13. Figure 2 As shown, this forms a three-stage jet.

[0046] It is understandable that the dimensions of nozzles 3 in each stage of the injector can be the same or different. For example, the inner diameter of nozzles 3 in each stage of the injector can gradually increase. However, due to flow rate considerations, in practice, the dimensions (such as the inner diameter of each section) of the mixing tube 4 in the next stage injector 11 are larger than the dimensions (such as the inner diameter of each section) of the mixing tube 4 in the previous stage injector 11. Figure 1 and Figure 2 As shown, the specific dimensions can be determined according to the actual needs on site.

[0047] For ease of assembly, during implementation, the main body 2 of the primary injector 11 in the spraying device 1 is also provided with a first connector 25, such as... Figure 1 and Figure 2 As shown, the first connector 25 is connected to the suction port 22. The first connector 25 is used to connect to the upstream pipe 7 (such as the exhaust pipe 87 used to transport exhaust gas). In implementation, the first connector 25 can preferably be a flange joint. Similarly, in implementation, the mixing pipe 4 of the final injector in the injection device 1 is also connected to a second connector 43, such as... Figure 1 and Figure 2 As shown, the second connector 43 is connected to the mixing pipe 4. The second connector 43 is used to connect to the downstream pipe 7. In implementation, a flange connector can be preferred for the second connector. Of course, in implementation, the nozzle 3 is also provided with a third connector 65 for connecting to the pipeline, such as... Figure 1 and Figure 2 As shown, this is so that a pipe for conveying ejector gas can be connected via a third connector 65. In practice, the third connector 65 may preferably be a flange joint.

[0048] Example 2

[0049] To address the issue of ensuring precise alignment between the nozzle 3 and the mixing pipe 4 more easily and efficiently on-site, the main difference between this embodiment 2 and embodiment 1 is that, in the spraying device 1 provided in this embodiment, the outer side of the main body 2 has a recessed hole 26, and a first opening 23 is connected to the recessed hole 26. The first opening 23 is preferably configured to be coaxial with the recessed hole 26. Figure 3 As shown; simultaneously, at least two threaded holes 27 are also constructed along the circumferential direction of the countersunk hole 26, as shown. Figure 3 As shown, in practice, the number of threaded holes 27 can preferably be three, four, or five, etc.

[0050] Accordingly, the outer diameter of the nozzle 3 is configured to fit the first opening 23. For example, the outer diameter of the nozzle 3 can be slightly smaller than the inner diameter of the first opening 23. The end of the nozzle 3 is also configured with a head 37 that fits the recessed hole 26. One end of the flow stabilizing channel 32 passes through the head 37 and forms an ejector inlet 31. Figure 3 As shown, during assembly, the head 37 of the nozzle 3 can be inserted into the recessed hole 26.

[0051] like Figure 3 As shown, the spraying device 1 provided in this embodiment also includes a cover component 6. The cover component 6 is configured with a flow channel 61 adapted to the nozzle 3. The flow channel 61 extends through both ends of the cover component 6. One end of the cover component 6 is configured with a flange 62. The flange 62 is configured with at least two through holes adapted to each threaded hole 27 along the circumferential direction of the flow channel 61. Figure 3 As shown; simultaneously, the cover component 6 is also constructed with a third connector for connecting the pipe 5, so as to connect the pipe used to transport the high-pressure ejector gas. In implementation, the third connector 65 can preferably be a flange connector, such as... Figure 3 As shown, the third connector can be preferably constructed at the other end of the cover component 6.

[0052] During assembly, the nozzle 3 can be inserted into the first opening 23, with the head 37 of the nozzle 3 located inside the recessed hole 26. The cover component 6 is detachably connected to the main body 2 through the engagement of the fastener 71 with the through hole and threaded hole 27, pressing the nozzle 3 tightly against the main body 2, so that the flow channel 61 is connected to the injection inlet 31, as shown in the figure. In this way, on the one hand, the nozzle 3 can be detachably installed to facilitate assembly and replacement of the nozzle 3 to meet the needs of different processes, and the nozzle 3 can be securely fixed to the main body 2. On the other hand, during implementation, the first opening 23 and the second opening 24 can be strictly aligned through high-precision machining. The first opening 23 can guide the nozzle 3 during assembly and can also limit and constrain the nozzle 3. The engagement of the first opening 23 and the nozzle 3 can ensure the installation accuracy of the nozzle 3, making it easier and more efficient for the assembler to ensure that the nozzle 3 and the mixing tube 4 are strictly aligned, thereby facilitating a better and more precise pressurization effect.

[0053] In a further embodiment, a first sealing ring 72 is provided between the head 37 of the nozzle 3 and the bottom of the recessed hole 26; a second sealing ring 73 is also provided between the head 37 of the nozzle 3 and the cover component 6, such as... Figure 3 As shown, the first sealing ring 72 and the second sealing ring 73 can be tightened by the tightening process of the fastener 71, thereby achieving a two-stage sealing effect, ensuring the sealing of the entire intake chamber 21, and achieving a better pressurization effect. In implementation, the end of the cover component 6 is also constructed with a protrusion 64 adapted to the head 37 of the nozzle 3, such as... Figure 3 As shown, the second sealing ring 73 is pressed against the head 37 of the nozzle 3 by the protrusion 64, which helps to achieve a better sealing effect.

[0054] In practice, the inner diameter of flow channel 61 can be the same as the inner diameter of steady flow channel 32 in order to effectively reduce pressure loss.

[0055] In a further embodiment, a positioning cylinder 28 is also provided inside the air intake chamber 21 of the main body 2, such as... Figure 3 As shown, one end of the positioning cylinder 28 is connected to the inner wall of the suction chamber 21. The inner diameter of the positioning cylinder 28 is equal to the inner diameter of the first opening 23, and the positioning cylinder 28 and the first opening 23 are coaxial. During assembly, the nozzle 3 is sequentially inserted into the main body 2 along the first opening 23 and the positioning cylinder 28, and is simultaneously constrained by the first opening 23 and the positioning cylinder 28. This allows for better installation accuracy of the nozzle 3 through the cooperation between the nozzle 3, the first opening 23, and the positioning cylinder 28, ensuring strict alignment between the nozzle 3 and the mixing pipe 4. Figure 3 As shown, this facilitates the achievement of better and more precise boosting effects.

[0056] In practice, the positioning cylinder 28 can be welded to the main body 2 or integrally formed with the main body 2, which will not be elaborated here.

[0057] Example 3

[0058] This embodiment provides a triethylene glycol dehydration and regeneration tail gas treatment system, including a gas-liquid separator 8 for gas-liquid separation and the aforementioned injection device 1. In implementation, the gas-liquid separator 8 can be an existing gas-liquid separator 8, which is configured with an inlet, a gas phase outlet, and a liquid phase outlet, such as... Figure 4 As shown, the exhaust gas enters the gas-liquid separator 8 through the inlet. The gas phase outlet of the gas-liquid separator 8 is connected to the inlet 22 of the first-stage injector 11 in the injection device 1 through the exhaust gas pipe 87. The liquid phase outlet of the gas-liquid separator 8 is equipped with a wastewater pipe, such as... Figure 4 As shown, the wastewater pipeline is equipped with a drainage pump 84. In actual operation, the exhaust gas entering the gas-liquid separator 8 undergoes gas-liquid separation within the gas-liquid separator 8. The separated gas (exhaust gas) is discharged through the gas phase outlet, while the separated liquid is discharged through the liquid phase outlet and can be input into the wastewater treatment facility of the natural gas station under the drive of the drainage pump 84. By configuring the gas-liquid separator 8 upstream of the injection device 1, water in the exhaust gas can be removed as much as possible, making the exhaust gas as dry as possible, which is more conducive to the subsequent utilization of the treated exhaust gas.

[0059] like Figure 4 As shown, a demister 83 is also provided at the gas phase outlet of the gas-liquid separator 8, so as to remove the condensate entrained in the gas and effectively reduce the water content of the gas.

[0060] like Figure 4 As shown, this system also includes a cooler 81. In implementation, an existing cooler 81 can be used. The cooler 81 is typically configured with two pipes. One pipe connects to cooling water, and the other pipe's port is used to input exhaust gas. The other port of the other pipe connects to the gas-liquid separator 8. During actual operation, the exhaust gas is transported along one pipe of the cooler 81, while the cooling water is transported along the other pipe. This allows for heat exchange between the exhaust gas and the cooling water during transport, effectively reducing the exhaust gas temperature and achieving the effect of condensing the exhaust gas. The condensed exhaust gas is more conducive to achieving better gas-liquid separation in the gas-liquid separator 8, thus removing as much moisture as possible from the exhaust gas. Of course, in a more complete solution, a refrigeration unit 82 is also included, such as... Figure 4 As shown, the refrigeration unit 82 is connected to one of the pipes of the cooler 81 through a cooling water pipe in order to provide cooling water to the cooler 81.

[0061] like Figure 4 As shown, in this embodiment, it also includes a main pipeline 9 for conveying high-pressure ejector gas and at least two branch pipelines 91 connected to the main pipeline 9, such as... Figure 4As shown, the main pipe 9 is connected to a high-pressure ejector gas source, and each branch pipe 91 is connected to the suction port 22 of the first-stage ejector 11 in the injection device 1. Each branch pipe 91 is equipped with a valve 92, such as... Figure 4 As shown, this allows for individual control of the on / off state of each branch pipe 91, and also facilitates control over the timing of the on / off state of each branch pipe 91. This not only makes it easier to control the pressure of the mixed gas output from the injection device 1, but also allows the mixed gas output from the injection device 1 to reach the required pressure more quickly and efficiently.

[0062] In this embodiment, the high-pressure ejector gas can preferably be the high-pressure natural gas from the station. In this embodiment, high pressure and low pressure are relative concepts. Of the two pressure data, the relatively higher one is called high pressure, and the relatively lower one is called low pressure. Since the pressure of the gas in the main pipeline 9 is greater than the pressure of the tail gas discharged from the gas-liquid separator 8, the gas in the main pipeline 9 can also be called high-pressure ejector gas.

[0063] In this embodiment, the mixing outlet 42 of the final injector in the injection device 1 is connected to the natural gas pipeline network. For example, the mixing outlet 42 of the final injector in the injection device 1 can be connected to the compressor of the natural gas pipeline network through the pipeline 7 so that the compressor can further pressurize it. Since the pressure of the mixed gas output from the mixing outlet 42 has reached the set threshold, the mixed gas can be smoothly drawn into the compressor of the downstream natural gas pipeline network.

[0064] like Figure 4 As shown, in a more complete embodiment, the main pipeline 9 is also connected to the gas-liquid separator 8 via a pressure-replenishing pipeline 85. A first pressure relief valve 88 is also installed on the pressure-replenishing pipeline 85. The opening and closing of the first pressure relief valve 88 depends on the gas pressure inside the gas-liquid separator 8. When the gas pressure inside the gas-liquid separator 8 is lower than a set value, the first pressure relief valve 88 opens, and natural gas can enter the gas-liquid separator 8 through the pressure-replenishing pipeline 85. When the gas pressure inside the gas-liquid separator 8 is higher than a set value, the first pressure relief valve 88 closes, and the pressure-replenishing pipeline 85 stops supplying natural gas to the gas-liquid separator 8. In implementation, the first pressure relief valve 88 can be an existing pressure relief valve.

[0065] like Figure 4 As shown, in a more complete embodiment, it also includes a vent pipe 86 with one end connected to the exhaust gas pipe 87, and the other end of the vent pipe 86 can be connected to a torch to burn off excess gas. Figure 4As shown, a second pressure relief valve 89 is installed on the vent line 86. During normal operation, the second pressure relief valve 89 is closed to prevent gas discharged from the gas-liquid separator 8 from entering the vent line 86 and causing waste. When a fault occurs downstream of the tail gas pipeline 87, such as a malfunction of the ejector, causing the gas phase outlet of the gas-liquid separator 8 to be unable to discharge gas, or when the ejection efficiency of the injection device 1 cannot meet the requirements of the gas-liquid separator 8, the second pressure relief valve 89 can be opened to send excess gas to the flare for combustion. In specific implementation, the second pressure relief valve 89 can be opened or closed according to the gas pressure inside the gas-liquid separator 8. When the gas pressure inside the gas-liquid separator 8 is higher than a set value, the gas in the gas-liquid separator 8 after removing moisture affects the entry of the TEG distillation column tail gas. Therefore, the second pressure relief valve 89 opens, allowing the gas after removing moisture to enter the vent line 86 and then be fed into the flare for combustion. When the gas pressure inside the gas-liquid separator 8 decreases and falls below a set value, the second pressure relief valve 89 closes to prevent gas waste.

[0066] In a more complete implementation, the system also includes a controller (such as a PLC), a pressure sensor, etc. The pressure sensor is installed in the gas-liquid separator 8 to detect the internal pressure of the gas-liquid separator 8. The controller is connected to the pressure sensor, the first pressure relief valve 88 and the second pressure relief valve 89 respectively, so as to automatically control the state of the first pressure relief valve 88 and the second pressure relief valve 89 according to the pressure data fed back by the pressure sensor, so as to achieve the purpose of automatic control and enable the system to operate continuously and stably.

[0067] In a more complete embodiment, the system further includes a triethylene glycol (TED) dehydration unit and a TED regeneration unit connected to the TED dehydration unit. The TED regeneration unit is connected to the inlet of the gas-liquid separator 8 via a pipeline. The TED dehydration unit receives wet natural gas and separates the solid and free states in the wet natural gas, removing a large amount of water vapor. Dry natural gas is then exiting the station, and the water vapor is absorbed by the TED solution to form a rich TED solution. The rich TED solution enters the TED regeneration unit for flash evaporation, and the flashed gas is transported to the tail gas cooling and separation unit. Simultaneously, after flash evaporation, the rich TED solution is processed to distill off the dissolved water and other gases, and the rich TED solution is transformed back into a lean TED solution, which is then recycled back into the TED dehydration unit. The other gases are transported to the gas-liquid separator 8 for cooling and separation.

[0068] In practice, the triethylene glycol dehydration device and the triethylene glycol regeneration device can be implemented using existing technologies. For example, the triethylene glycol dehydration device and the triethylene glycol regeneration device in Chinese Patent CN 118807391 A can be used, which will not be elaborated here.

[0069] The above description is only a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model.

Claims

1. A spraying device, characterized in that, It includes at least two stages of injectors, each injector having an ejector inlet for inputting ejector gas, an intake inlet for inhaling exhaust gas, and a mixing outlet. The ejector inlet, intake inlet, and mixing outlet are interconnected, with the ejector inlet corresponding to the mixing outlet. At least one throttling channel is constructed between the ejector inlet and the mixing outlet. The mixing outlet of the previous stage injector is connected to the intake inlet of the next stage injector, and each stage of injectors is connected in series to form a whole.

2. The spraying device according to claim 1, characterized in that, The injector includes a main body, a nozzle, and a mixing tube. The main body is configured with an air intake chamber for inhaling exhaust gas, an intake port connected to the air intake chamber, a first opening, and a second opening, with the first opening facing the second opening. The ejector inlet is constructed at one end of the nozzle, and the other end of the nozzle is constructed with an injection port. The nozzle is constructed with the throttling channel, and the ejector inlet and the injection port are connected through the throttling channel. The end of the nozzle with the injection port is inserted into the air intake chamber through the first opening and is directly opposite the second opening. The nozzle is connected to the air intake chamber. One end of the mixing tube is connected to the main body and communicates with the second opening. The mixing outlet is constructed at the other end of the mixing tube. The throttling channel is constructed inside the mixing tube. The second opening is connected to the mixing outlet through the throttling channel.

3. The spraying device according to claim 2, characterized in that, The nozzle's spray port is inserted into the second opening, the inner diameter of the second opening being larger than the outer diameter of the spray port, and there is a gap between the nozzle and the sidewall of the second opening.

4. The spraying device according to claim 2, characterized in that, The throttling channel includes a contraction section, a throttling section connected to the contraction section, and a diffusion section connected to the throttling section. The inner diameter of the contraction section gradually increases in the direction away from the throttling section, and the inner diameter of the diffusion section gradually increases in the direction away from the throttling section.

5. The spraying device according to claim 4, characterized in that, The nozzle is also equipped with a flow stabilizing channel, which is a direct flow channel. One end of the flow stabilizing channel is connected to the injection inlet, and the other end is connected to the contraction section in the throttling channel. The diffusion section is connected to the injection port. And / or, within the mixing tube, a contraction section extends through one end of the mixing tube opposite to the mixing outlet and forms the mixing inlet, which is directly opposite the second opening. The inner diameter of the mixing inlet is larger than the outer diameter of the injection port, and the diffusion section is connected to the mixing outlet.

6. The spraying device according to claim 2, characterized in that, The mixing outlet of the upper-stage injector is connected to the inlet of the lower-stage injector through a connecting pipe. The connecting pipe includes a straight pipe section and a curved pipe section. One end of the straight pipe section is connected to the body of the lower-stage injector and is connected to the inlet. The other end of the straight pipe section is connected to the curved pipe section, which is connected to the mixing pipe. The straight pipe section is perpendicular to the mixing pipe.

7. The spraying device according to claim 6, characterized in that, The inner diameter of the connecting pipe is the same as the inner diameter of the mixing outlet; And / or, the mixed pipe and the connecting pipe are integrally formed components; And / or, including two or three injectors connected in series; And / or, the size of the mixing tube in the upper stage injector is smaller than the size of the mixing tube in the lower stage injector; the size of the nozzle in the upper stage injector is smaller than the size of the nozzle in the lower stage injector.

8. The spraying device according to any one of claims 2-7, characterized in that, The outer side of the main body of the injector is also provided with a recessed hole, the first opening is connected to the recessed hole and the first opening is coaxial with the recessed hole; at least two threaded holes are also provided along the circumferential direction of the recessed hole. The outer diameter of the nozzle is designed to fit the first opening, and the end of the nozzle is also designed to fit the head of the recessed hole. The nozzle is inserted into the main body through the first opening, and the head of the nozzle is inserted into the recessed hole. It also includes a cover component, which has a flow channel adapted to the nozzle, the flow channel passing through both ends of the cover component, and a flange at one end of the cover component, the flange having at least two through holes adapted to each threaded hole along the circumferential direction of the flow channel. The cover component is detachably connected to the main body via fasteners that fit the threaded holes, and presses the nozzle head against the main body. The flow channel is connected to the ejector inlet.

9. The spraying device according to claim 8, characterized in that, A first sealing ring is provided between the nozzle head and the bottom of the sink hole; a second sealing ring is provided between the nozzle head and the cover component. And / or, the inner diameter of the flow channel is the same as the inner diameter of the steady flow channel.

10. The spraying device according to claim 8, characterized in that, The main body's air intake chamber is also equipped with a positioning cylinder. One end of the positioning cylinder is connected to the inner wall of the air intake chamber. The inner diameter of the positioning cylinder is equal to the inner diameter of the first opening, and the positioning cylinder and the first opening are coaxial.

11. A triethylene glycol dehydration and regeneration tail gas treatment system, comprising a gas-liquid separator, said gas-liquid separator being configured with an inlet for inputting tail gas, a gas phase outlet and a liquid phase outlet, characterized in that, It also includes the injection device according to any one of claims 1-10, wherein the gas phase outlet is connected to the inlet of the first-stage injector in the injection device via an exhaust gas pipe; It also includes a main pipeline for conveying ejector gas and at least two branch pipelines connected to the main pipeline. Each branch pipeline is connected to an ejector inlet at each stage in the injection device, and each branch pipeline is equipped with a valve.

12. The triethylene glycol dehydration and regeneration tail gas treatment system according to claim 11, characterized in that, It also includes a pressure-replenishing pipeline. The main pipeline is connected to the gas-liquid separator through the pressure-replenishing pipeline, and a first pressure relief valve is also installed on the pressure-replenishing pipeline. It also includes a venting pipe with one end connected to the exhaust gas pipe and the other end connected to the flare. A second pressure relief valve is installed on the venting pipe. It also includes a triethylene glycol dehydration unit and a triethylene glycol regeneration unit connected to the triethylene glycol dehydration unit. The triethylene glycol regeneration unit is connected to the inlet of the gas-liquid separator via a pipeline.

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