Multi-stage liquid injection device with continuously adjustable graded loads and operation method of multi-stage liquid injection device

Abstract

The multi-stage liquid injection device comprises an outer pipe fixed on a gas phase medium pipeline needing to be injected with an injection agent and an inner pipe capable of rotating in the outer pipe in a gapless mode, and the end, located in the gas phase medium pipeline, of the inner pipe or / and the outer pipe is / are closed. The outer pipe is connected with a liquid inlet pipe and at least two nozzles, the liquid inlet pipe is located outside the gas-phase medium pipeline and used for introducing an injection agent into the inner pipe, and the nozzles are located in the gas-phase medium pipeline and used for injecting the injection agent into the gas-phase medium pipeline; a plurality of liquid outlets corresponding to the nozzles are formed in the circumferential direction of the inner pipe, and the number of the liquid outlets corresponding to the nozzles can be the same or different; the inner pipe is provided with a plurality of rotating positions, and when the rotating positions are rotated, all the nozzles are communicated with or not communicated with the corresponding liquid outlets, so that the multi-stage liquid injection device has multiple liquid injection states. According to the operation method of the multi-stage liquid injection device, continuous adjustment of liquid injection grading loads can be achieved, and the injection amount of an injection agent in a gas phase medium pipeline meets the requirements of a liquid injection process.

Description

Technical Field

[0001] The invention relates to the technical field of petrochemical equipment, and in particular to a multi-stage liquid injection device with continuously adjustable graded load and an operating method thereof. Background Art

[0002] In order to achieve production requirements such as corrosion protection, mixing, washing, scale prevention, and gas-liquid heat exchange, petroleum refining equipment usually needs to inject a certain amount of injection agent into the gas phase medium. The injection agent can be water, neutralizer, corrosion inhibitor, etc.

[0003] At present, gas phase medium pipelines (such as oil and gas pipelines) generally adopt the straight pipe filling method. This filling method cannot fully mix the injection agent with oil and gas, and there are problems such as low injection agent utilization and serious waste. The method of installing a nozzle on the injection pipe can significantly improve the gas-liquid contact effect and increase the utilization rate of the injection agent. However, it is found in industrial practice that the nozzle is prone to clogging. The reason is that small-flow injection agents often use nozzles with small nozzles. Due to the different components and properties of various injection agents, various impurities will be generated after mixing. In addition, improper operation will cause the nozzle to be easily clogged. Once the nozzle is clogged, it is necessary to stop and replace it, which greatly delays production.

[0004] Chinese patent application number 202321700639.1 discloses a liquid injection device with an online switchable adaptive adjustment structure, which has an independently detachable liquid injection outer tube and liquid injection inner tube, and two sets of parallel filter pipelines. When one set of channels or nozzles is blocked, the liquid medium can be sprayed out from the other set of channels and nozzles to ensure the normal filling of the liquid medium. However, this liquid injection device has the following disadvantages:

[0005] 1. The secondary injection nozzle adopts a double-layer or three-layer casing structure, which is relatively complex and difficult to process and manufacture;

[0006] 2. The outer diameter of the injection outer tube is large, while the injection tube opening on the medium pipeline is small. If it is replaced with a secondary injection nozzle, the hole needs to be enlarged, which increases the difficulty of construction;

[0007] 3. In the secondary injection nozzle, the inner diameter of the inner tube of the primary injection nozzle is about 20mm. In order to achieve the same or larger injection volume, the annular gap between the outer tube and the casing of the secondary injection nozzle is only 2-3mm, which is easy to get blocked;

[0008] 4. The secondary injection nozzle cannot meet the requirements of the injection process. Summary of the invention

[0009] In order to overcome the shortcomings of the background technology, the present invention discloses a multi-stage liquid injection device with continuously adjustable graded load and an operation method thereof, the purpose of which is:

[0010] 1. Make the injection device have multiple injection states to meet the injection process requirements;

[0011] 2. Reduce the difficulty of manufacturing and installing the injection device;

[0012] 3. Solve the problem of nozzle clogging.

[0013] In order to achieve the above-mentioned invention object, the present invention adopts the following technical scheme:

[0014] A multi-stage liquid injection device with continuously adjustable graded load comprises an outer tube fixed on a gas phase medium pipeline to be injected with an injection agent, an inner tube capable of rotating without gap in the outer tube, and one end of the inner tube or / and the outer tube located in the gas phase medium pipeline is closed; the outer tube is connected with a liquid inlet pipe and at least two nozzles, the liquid inlet pipe is located outside the gas phase medium pipeline and is used to pass the injection agent into the inner tube, and the nozzle is located in the gas phase medium pipeline and is used to inject the injection agent into the gas phase medium pipeline; a plurality of liquid outlets corresponding to the nozzles are arranged along the circumference of the inner tube, and the number of liquid outlets corresponding to each nozzle can be the same or different; the inner tube has a plurality of rotation positions, and when the rotation positions are rotated, each nozzle is either connected or disconnected with the corresponding liquid outlet, so that the multi-stage liquid injection device has a plurality of liquid injection states.

[0015] To further improve the technical solution, a rotation actuator is connected to the end of the inner tube located outside the gas medium pipeline, and the rotation actuator is used to realize the rotation of the inner tube; a dynamic sealing structure is provided at the end of the outer tube located outside the gas medium pipeline, and the dynamic sealing structure is used to realize dynamic sealing between the inner tube and the outer tube.

[0016] To further improve the technical solution, the dynamic sealing structure is mainly composed of a stuffing box, packing and a gland, wherein the stuffing box is sealed and fixed at the end of the outer tube.

[0017] To further improve the technical solution, a threaded connection structure is provided between the bottom of the stuffing box and the inner tube.

[0018] To further improve the technical solution, a rotation indicator disk is fixed on the gland, and a rotation pointer is fixed on the inner tube.

[0019] To further improve the technical solution, a limiting mechanism is provided on the pressure cover, and the limiting mechanism is used to limit the rotation of the index pointer within one circle.

[0020] To further improve the technical solution, the nozzles are arranged along the axial direction of the outer tube.

[0021] To further improve the technical solution, the outer tube is connected to two nozzles, each nozzle corresponds to two liquid outlets, and the inner tube has four positions: fully closed, single open I, single open II, and fully open.

[0022] To further improve the technical solution, the outer tube is connected to three nozzles, each nozzle corresponds to four liquid outlets, and the inner tube has eight positions: fully closed, single open I, single open II, single open III, double open I, double open II, double open III, and fully open.

[0023] To further improve the technical solution, the nozzles are arranged along the circumference of the outer tube.

[0024] To further improve the technical solution, two nozzles are arranged along the circumference of the outer tube, and the inner tube has four rotation positions: fully closed, single open I, fully open, and single open II.

[0025] To further improve the technical solution, three nozzles are arranged along the circumference of the outer tube, and the inner tube has six positions: fully closed, single open I, double open I, fully open, double open II, and single open II.

[0026] To further improve the technical solution, there are at least three nozzles, which are arranged along the circumference and axial direction of the outer tube.

[0027] To further improve the technical solution, the opening sizes of the nozzles can be the same or different.

[0028] The invention discloses an operating method of a multi-stage liquid injection device, wherein an inner tube is shifted so that the injection amount of an injection agent in a gas phase medium pipeline meets the requirements of the liquid injection process.

[0029] To further improve the technical solution, a flow meter is installed at the front end of the liquid inlet pipe to monitor the injection amount of the injection agent in the gas phase medium pipeline;

[0030] A. If the injection volume of the injection agent is lower than the injection process requirements, the inner tube is opened and repositioned to allow more nozzles to participate in the injection;

[0031] B. If the injection volume of the injection agent is higher than the injection process requirements, the inner tube is reduced and rotated to allow fewer nozzles to participate in the injection;

[0032] C. If the injection volume does not match the current position, it is determined that the nozzle is clogged. In this case, turn the inner tube to a position with the same opening.

[0033] To further improve the technical solution, when fine-tuning the injection amount of the injection agent, the inner tube can be slightly rotated to increase or decrease the overlap between the nozzle and the corresponding liquid outlet.

[0034] To further improve the technical solution, when the opening sizes of the nozzles are different, the nozzle with a large opening can be replaced by the nozzle with a small opening by rotating the inner tube to increase the injection amount of the injection; or the nozzle with a small opening can be replaced by the nozzle with a large opening to reduce the injection amount of the injection.

[0035] After implementing the above technical solution, compared with the background technology, the present invention can produce the following beneficial effects:

[0036] 1. This multi-stage injection device has a variety of injection states. By shifting, one nozzle or multiple nozzles can be opened to inject liquid into the gas phase medium pipeline, meeting the requirements of the injection amount and injection rate of the injection agent in the injection process.

[0037] 2. When a nozzle is clogged, another nozzle can be opened by shifting to replace the clogged nozzle, so that the injection operation can proceed smoothly.

[0038] 3. Since the multi-stage liquid injection device adopts a compact double-layer pipe structure with a small outer diameter, it is not necessary to expand the gas phase medium pipeline during installation, which reduces the manufacturing difficulty and installation difficulty of the multi-stage liquid injection device.

[0039] 4. The operation method of the multi-stage injection device can realize the continuous adjustment of the injection classification load, so that the injection amount of the injection agent in the gas phase medium pipeline meets the requirements of the injection process. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Attached Figure 1 What is shown is a schematic diagram of the cross-sectional structure of the outer tube in Example 1.

[0041] Attached Figure 2 Shown is a schematic structural diagram of the inner tube in Example 1.

[0042] Attached Figure 3 What is shown is a schematic cross-sectional structure diagram of the multi-stage liquid injection device in Example 1.

[0043] Attached Figure 4 What is shown is a schematic diagram of the structure of the indexing indicator plate and the indexing pointer in Example 1.

[0044] Attached Figure 5 The cross-sectional structure diagram of the outer tube in Example 2 is shown.

[0045] Attached Figure 6 Shown is a schematic structural diagram of the inner tube in Example 2.

[0046] Attached Figure 7 What is shown is a schematic diagram of the structure of the indexing plate and the indexing pointer in Embodiment 2.

[0047] Attached Figure 8 Shown is a schematic structural diagram of the dynamic sealing structure in Example 2.

[0048] Attached Fig. 9 Shown is a schematic diagram of the cross-sectional structure of the outer tube and the inner tube in Example 3.

[0049] Attached Fig.10 Shown is a schematic diagram of the cross-sectional structure of the outer tube and the inner tube in a modified example of Example 3.

[0050] Attached Fig.11 What is shown is a schematic diagram of a combination of three nozzles in Example 4.

[0051] Attached Fig.12 Shown is a schematic diagram of another combination of three nozzles in Example 4.

[0052] Attached Fig.13 What is shown is a schematic diagram of the combination of four nozzles in Example 4.

[0053] In the attached figure: 1. gas phase medium pipeline; 2. outer tube; 3. inner tube; 31. liquid outlet; 32. liquid inlet; 33. ring groove; 34. shaft body; 35. actuator; 4. dynamic sealing structure; 41. stuffing box; 42. packing; 43. gland; 44. rotation indicator plate; 45. rotation pointer; 5. liquid inlet pipe; 6. nozzle A; 7. nozzle B; 8. nozzle C; 9. nozzle D. DETAILED DESCRIPTION

[0054] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the scope of protection of the present invention. It should be noted that in the description of the present invention, the terms "front", "rear", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings, which are only for the convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention. It should also be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or the internal connection of two elements. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0055] Embodiment 1:

[0056] A multi-stage liquid injection device with continuously adjustable graded load comprises an outer tube and an inner tube. The structure and function thereof are described in detail below.

[0057] See attached Figure 1 , attached Figure 1 The figure shows the cross-sectional structure of the outer tube. Figure 1It can be seen that the bottom end of the outer tube 2 is closed, a liquid inlet pipe 5 is connected to the upper half of the outer tube 2, and two nozzles 6 and 7 are installed in the lower half of the outer tube 2. The two nozzles are arranged up and down along the axial direction of the outer tube 2.

[0058] See attached Figure 2 , attached Figure 2 The structure diagram of the inner tube 3 is shown in FIG. Figure 2 It can be seen that the upper end of the inner tube 3 is closed and is a solid shaft body 34. Four liquid inlets 32 are provided in the upper half of the inner tube 3 along the circumference of the inner tube 3, and the four liquid inlets 32 are arranged in a 90° array. Two groups of liquid outlets 31 are provided in the lower half of the inner tube 3 along the circumference of the inner tube, the upper group has two liquid outlets 31, and the two liquid outlets are arranged at 180°; the lower group also has two liquid outlets 31, and the two liquid outlets are arranged at 90°.

[0059] See attached Figure 3 , attached Figure 3 The figure shows a cross-sectional structure diagram of a multi-stage injection device. Figure 3 It can be seen that the outer tube 2 is installed on the gas-phase medium pipeline 1, the liquid inlet pipe 5 is located outside the gas-phase medium pipeline 1, and the two nozzles 6 and 7 are located inside the gas-phase medium pipeline 1. It can also be seen that the inner tube 3 is installed inside the outer tube 2. Since the inner tube 3 and the outer tube 2 have a matching relationship, the inner tube 3 can rotate without gap inside the outer tube 2. During the rotation process, the four liquid inlets 32 on the inner tube 3 correspond to the liquid inlet pipe 5 on the outer tube 2, and the two groups of liquid outlets 31 correspond to the upper and lower nozzles 6 and 7 respectively.

[0060] In addition, a dynamic sealing structure 4 is provided at the upper end of the outer tube 2 and between the outer tube 2 and the shaft body 34, and the dynamic sealing structure 4 is used to realize dynamic sealing between the outer tube 2 and the shaft body 34 to avoid leakage. The dynamic sealing structure 4 is mainly composed of a stuffing box 41, a packing 42 and a gland 43, wherein the stuffing box 41 is sealed and fixed at the end of the outer tube 2.

[0061] In order to facilitate the rotation of the inner tube 3, an actuator 35 is installed at the end of the shaft body 34. The actuator 35 can be a handle, a rocker arm, or a motion mechanism driven by a motor or a cylinder. In this embodiment, the actuator 35 is a handle.

[0062] Refer to the liquid injection status table 1, where ⊙ in table 1 indicates the opening position of the liquid outlet.

[0063] position 0° 90° 180° 270° Transposition Single openingⅠ Single Open Ⅱ Fully open All Off The opening positions of the two liquid outlets corresponding to nozzle A ⊙ ⊙ The opening positions of the two liquid outlets corresponding to nozzle B ⊙ ⊙

[0064] In this embodiment, the inner tube has four positions: single open I, single open II, fully open, and fully closed. Figure 2 and 3For ease of description, the four liquid inlets 32 are marked as 0°, 90°, 180°, and 270° in azimuth. The upper nozzle is nozzle A6, and the two liquid outlets 31 corresponding to nozzle A6 are marked as A0° and A180° in azimuth, respectively; the lower nozzle is nozzle B7, and the two liquid outlets 31 corresponding to nozzle B7 are marked as B90° and B180° in azimuth, respectively.

[0065] When the inner tube 3 is in the single-opening position I (0°), the liquid inlet pipe 5 is connected to the liquid inlet port 32 at the 0° position, and the injection agent enters the inner tube 3 from the liquid inlet pipe 5. At the same time, the liquid outlet A0° is connected to the nozzle A6, and the liquid outlet B0° is not connected to the nozzle B7, and the injection agent is sprayed out from the nozzle A.

[0066] When the inner tube 3 is in the single-opening II position (90°), the liquid inlet pipe 5 is connected to the liquid inlet port 32 at the 90° position, and the injection agent enters the inner tube 3 from the liquid inlet pipe 5. At the same time, the liquid outlet A90° is not connected to the nozzle A6, and the liquid outlet B90° is connected to the nozzle B7, and the injection agent is sprayed out from the nozzle B.

[0067] When the inner tube 3 is in the fully open position (180°), the liquid inlet pipe 5 is connected to the liquid inlet port 32 at the 180° position, and the injection agent enters the inner tube 3 from the liquid inlet pipe 5. At the same time, the liquid outlet A is connected to the nozzle A6 at 180°, and the liquid outlet B is connected to the nozzle B7 at 180°, and the injection agent is sprayed out from the nozzle A and the nozzle B at the same time.

[0068] When the inner tube 3 is in the fully closed position (270°), the liquid inlet pipe 5 is connected to the liquid inlet port 32 at the 270° position, and the injection enters the inner tube 3 from the liquid inlet pipe 5. At the same time, the liquid outlet A270° is not connected to the nozzle A6, and the liquid outlet B270° is not connected to the nozzle B7, and the injection cannot be sprayed out.

[0069] As can be seen from the above, the inner tube 3 has four positions. When the positions are rotated, the two nozzles are connected or disconnected with the corresponding liquid outlets, so that the multi-stage liquid injection device has four liquid injection states: fully closed, single open I, single open II, and fully open. Moreover, the multi-stage liquid injection device can be continuously adjusted according to the graded load of the liquid injection operation. The liquid injection amount of the injection agent in the gas phase medium pipeline can be adjusted by single opening and full opening to meet the requirements of the liquid injection process.

[0070] In addition, there are two positions for the single opening. For example, when the inner tube 3 is in the single opening position II, if the nozzle B7 is blocked, the inner tube 3 can be turned to the single opening position I, so that the injection agent is sprayed from the nozzle A6, ensuring the smooth progress of the injection operation.

[0071] See attached Figure 4 , attached Figure 4The structure diagram of the indexing indicator plate and the indexing pointer in Example 1 is shown. In order to indicate the indexing, an indexing indicator plate 44 is fixed on the gland 43, and an indexing pointer 45 is fixed on the inner tube 3. The indexing indicator plate 44 has four indexing indication areas, and the words "fully closed, single open I, single open II, fully open" are marked in each indexing indication area. The indexing pointer 45 points to "single open I", indicating that nozzle A is in the injection state; the indexing pointer 45 points to "single open II", indicating that nozzle B is in the injection state; the indexing pointer 45 points to "fully open", indicating that both nozzle A and nozzle B are in the injection state; the indexing pointer 45 points to "fully closed", indicating that no injection.

[0072] Embodiment 2:

[0073] See attached Figure 5 , attached Figure 5 The cross-sectional structure diagram of the outer tube in Example 2 is shown. The difference between this embodiment and Example 1 is that three nozzles are installed in the lower half of the outer tube 2, and the three nozzles are arranged vertically along the axial direction of the outer tube 2, namely nozzle A6, nozzle B7 and nozzle C8.

[0074] See attached Figure 6 , attached Figure 6 The diagram shows the structure of the inner tube in Example 2. An annular groove 33 is provided in the upper half of the inner tube 3 along the circumference of the inner tube 3, and a liquid inlet 32 ​​is provided in the annular groove, wherein the annular groove corresponds to the liquid inlet pipe 5. Due to the presence of the annular groove, no matter which position the inner tube 2 is located, the injection can always enter the inner tube 2 from the liquid inlet pipe 5. In the lower half of the inner tube 2, three groups of liquid outlets 31 are provided along the circumference of the inner tube 2, namely, upper, middle and lower groups, and the three groups of liquid outlets 31 correspond to nozzles A6, nozzles B7 and nozzles C8, respectively.

[0075] Refer to the liquid injection status table 2, where ⊙ in table 2 indicates the opening position of the liquid outlet.

[0076] position 0° 45° 90° 135° 180° 225° 270° 315° Transposition All Off Single openingⅠ Single Open Ⅱ Single opening Ⅲ Double OpenⅠ Double Open Ⅱ Double Open Ⅲ Fully open The opening positions of the four liquid outlets corresponding to nozzle A ⊙ ⊙ ⊙ ⊙ The opening positions of the four liquid outlets corresponding to nozzle B ⊙ ⊙ ⊙ ⊙ The opening positions of the four liquid outlets corresponding to the nozzle C ⊙ ⊙ ⊙ ⊙

[0077] In this embodiment, the inner tube 3 has eight positions: fully closed, single open I, single open II, single open III, double open I, double open II, double open III, and fully open. For ease of description, the upper group has four liquid outlets, and the four liquid outlets are marked as A45°, A180°, A225°, and A315° according to their directions; the middle group also has four liquid outlets, and the four liquid outlets are marked as B90°, B180°, B270°, and B315° according to their directions; the lower group also has four liquid outlets, and the four liquid outlets are marked as C135°, C225°, C270°, and C315° according to their directions.

[0078] When the inner tube 3 is in the fully closed position (0°), the liquid outlet A0° is not connected to the nozzle A6, the liquid outlet B0° is not connected to the nozzle B7, and the liquid outlet C0° is not connected to the nozzle C8, and the injection cannot be sprayed out.

[0079] When the inner tube 3 is in the single-opening I position (45°), only the liquid outlet A45° is connected to the nozzle A6, and the injection agent is sprayed out from the nozzle A.

[0080] When the inner tube 3 is in the single-opening II position (90°), only the liquid outlet B90° is connected with the nozzle B7, and the injection agent is sprayed out from the nozzle B.

[0081] When the inner tube 3 is located at the single-opening III rotation position (135°), only the liquid outlet C135° is connected with the nozzle C8, and the injection agent is sprayed out from the nozzle C.

[0082] When the inner tube 3 is in the double-opening I rotation position (180°), the liquid outlet A is connected to the nozzle A6 by 180°, and the liquid outlet B is connected to the nozzle B7 by 180°, and the injection agent is sprayed out from the nozzle A and the nozzle B at the same time.

[0083] When the inner tube 3 is located at the double-opening II position (225°), the liquid outlet A 225° is connected to the nozzle A6, and the liquid outlet C 225° is connected to the nozzle C8, and the injection agent is sprayed out from the nozzle A and the nozzle C at the same time.

[0084] When the inner tube 3 is located at the double-opening III rotation position (270°), the liquid outlet B 270° is connected to the nozzle B7, and the liquid outlet C 270° is connected to the nozzle C8, and the injection agent is sprayed out from the nozzle B and the nozzle C at the same time.

[0085] When the inner tube 3 is in the fully open position (315°), the liquid outlet A 315° is connected to the nozzle A6, the liquid outlet B 315° is connected to the nozzle B7, and the liquid outlet C 315° is connected to the nozzle C8, and the injection agent is sprayed out from the nozzle A, nozzle B, and nozzle C at the same time.

[0086] See attached Figure 7 , attached Figure 7 The structure diagram of the indexing plate and the indexing pointer in Embodiment 2 is shown. Accordingly, the indexing plate 44 has eight indexing areas, each of which is marked with the words "fully closed, single opening I, single opening II, single opening III, double opening I, double opening II, double opening III, fully open".

[0087] Compared with Example 1, it can be seen that this embodiment has three single-open positions, three double-open positions and one triple-open (full-open) position. In terms of the graded load of liquid injection, the additional triple-open position allows nozzles A, B, and C to participate in liquid injection at the same time, increasing the flow rate of liquid injection. In terms of redundancy, if nozzle A is blocked, the inner tube can be turned to the double-open III position to ensure double-open liquid injection; if both nozzles A and B are blocked, the inner tube can be turned to the single-open III position to ensure single-open liquid injection.

[0088] In addition, the opening sizes of the three nozzles can be the same or different. For example, if the opening diameter of nozzle A is larger than that of nozzle B, and the opening diameter of nozzle B is larger than that of nozzle C, then the flow rate of single opening I is larger than that of single opening II, and the flow rate of single opening II is larger than that of single opening III. Similarly, the three double opening positions also have three different injection flow rates, the flow rate of double opening I is larger than that of double opening II, and the flow rate of double opening II is larger than that of double opening III. In this way, with the full opening position, the injection device has seven injection states with different flow rates, which can maximize the satisfaction of production needs.

[0089] See attached Figure 8 , attached Figure 8 The structure diagram of the dynamic sealing structure in Example 2 is shown. This embodiment is also different from Example 1 in that a protruding threaded connection structure is provided between the bottom of the stuffing box 41 and the inner tube 3. The purpose of providing the threaded connection structure is: on the one hand, the threaded connection plays a sealing role to a certain extent; on the other hand, it is easy to disassemble the packing.

[0090] In the first embodiment, the packing 42 is pressed tightly in the stuffing box 41 by the gland 43. When the packing 42 needs to be replaced, it is difficult to remove it. After a threaded connection structure is provided between the bottom of the stuffing box 41 and the inner tube 3, the packing 42 can be pushed upward by rotating the inner tube 3, which is convenient for replacing the packing. During operation, it is desired that the indexing pointer 45 rotates within one circle, so a detachable limiting mechanism (not shown in the figure) is also provided on the gland 43, which can limit the indexing pointer 45 to rotate within one circle.

[0091] Embodiment 3:

[0092] In both Embodiment 1 and Embodiment 2, the nozzles are arranged up and down along the axial direction of the outer tube 2. In fact, the nozzles can also be arranged along the circumferential direction of the outer tube 2.

[0093] See attached Fig. 9 , attached Fig. 9The cross-sectional structure diagram of the outer tube and the inner tube in Example 3 is shown. The outer tube 2 is provided with nozzles A6 and B7 along the circumferential direction, and the angle between nozzles A6 and B7 is 90°. The inner tube 3 is provided with liquid outlet a and liquid outlet b along the circumferential direction, and the angle between liquid outlet a and liquid outlet b is also 90°. The inner tube 3 has four positions: fully closed, single open I, fully open, and single open II.

[0094] When the inner tube 3 is in the fully closed position (0°), the liquid outlet a, the liquid outlet b and the nozzle A6, the nozzle B7 are completely offset, and the injection cannot be sprayed out.

[0095] When the inner tube 3 is in the single opening Ⅰ (90°) position, the liquid outlet a is connected with the nozzle B7, and the injection agent is sprayed out from the nozzle B.

[0096] When the inner tube 3 is in the fully open (180°) position, the liquid outlet a is connected to the nozzle A6, and the liquid outlet b is connected to the nozzle B7, and the injection agent is sprayed out from the nozzle A and the nozzle B at the same time.

[0097] When the inner tube 3 is in the single opening II (270°) position, the liquid outlet b is connected with the nozzle A6, and the injection agent is sprayed out from the nozzle A.

[0098] Similarly, three nozzles can also be installed along the circumferential direction of the outer tube 2. Fig.10 , attached Fig.10 The schematic diagram of the cross-sectional structure of the outer tube and the inner tube in the modified example of embodiment 3 is shown. The three nozzles are arranged adjacent to each other with an angle of 60°. Three liquid outlets a, b, and c are opened in the circumferential direction on the inner tube 2. The three liquid outlets are arranged adjacent to each other with an angle of 60°. At this time, the inner tube 2 has six positions: fully closed, single open I, double open I, fully open, double open II, and single open II.

[0099] Embodiment 4:

[0100] Different from the embodiments 1-3, the nozzles have multiple combinations.

[0101] See attached Fig.11 , attached Fig.11 The diagram shows a combination of three nozzles in Example 4. For example, nozzle A6, nozzle B7 and nozzle C8 are installed on the outer tube, wherein nozzle A6 and nozzle B7 are arranged in the circumferential direction, nozzle C8 and nozzle B7 are arranged in the axial direction of the outer tube, and nozzle A6, nozzle B7 and nozzle C8 are arranged in a roughly right triangle. Nozzle A6 and nozzle B7 correspond to the two lower liquid outlets, nozzle C8 corresponds to the upper liquid outlet, and the inner tube has four positions: fully closed, double open, triple open, and single open.

[0102] See attached Fig.12 , attached Fig.12The figure shows another combination of three nozzles in Example 4. Nozzle C8 and nozzle B7 can also be arranged in a staggered manner, in which case nozzle A6, nozzle B7 and nozzle C8 are arranged in an isosceles triangle. In this case, the positions of the upper and lower groups of liquid outlets are staggered by 45 degrees, but the inner tube still has four rotation positions: fully closed, single open, double open, and triple open.

[0103] See attached Fig.13 , attached Fig.13 The diagram shows a combination of four nozzles in Example 4. For another example, nozzle A6, nozzle B7, nozzle C8 and nozzle D9 are installed on the outer tube 2, wherein nozzle A6 and nozzle B7 are arranged in the circumferential direction, nozzle C8 and nozzle D9 are arranged in the axial direction of the outer tube 2, and nozzle A6, nozzle B7, nozzle C8 and nozzle D9 are arranged in a roughly diamond shape. The inner tube has eight positions: fully closed, single open I, double open I, single open II, double open II, three open, and four open. Obviously, this combination of nozzles enables the injection device to have more injection states.

[0104] In order to illustrate the operation method of the multi-stage liquid injection device, the present invention also discloses an operation method of the multi-stage liquid injection device, the core of which is that a flow meter (not shown in the figure) is installed at the front end of the liquid inlet pipe 5, and when adjusting the injection amount of the injection agent, the inner tube 3 is shifted so that the injection amount of the injection agent in the gas phase medium pipeline 1 meets the requirements of the injection process.

[0105] A. If the injection volume of the injection agent is lower than the injection process requirement, the inner tube 3 is opened and rotated to allow more nozzles to participate in the injection.

[0106] B. If the injection volume of the injection agent is higher than the injection process requirement, the inner tube 3 is opened and rotated to allow fewer nozzles to participate in the injection.

[0107] C. If the injection amount of the injection agent does not match the position it is in, it is determined that a nozzle is blocked. At this time, the inner tube 3 is turned to a position with the same opening. For example, when the inner tube 3 is in the single opening position I, the nozzle A is blocked. At this time, the inner tube 3 can be turned to the single opening position II, so that the injection agent is sprayed out from the nozzle B to ensure the smooth progress of the injection operation.

[0108] D. When it is necessary to fine-tune the injection volume of the injection agent, the inner tube 3 can be slightly rotated to increase or decrease the overlap between the nozzle and the corresponding liquid outlet.

[0109] E. When the opening sizes of the nozzles are different, the nozzle with a large opening can be replaced by the nozzle with a small opening by rotating the inner tube 3 to increase the injection amount of the injection; the nozzle with a small opening can also be replaced by the nozzle with a large opening to reduce the injection amount of the injection.

[0110] As can be seen from the above, the multi-stage injection device has multiple injection states. By switching, one nozzle or multiple nozzles can be opened to inject liquid into the gas phase medium pipeline, meeting the requirements of the injection amount and injection rate of the injection process. When a nozzle is blocked, another nozzle can be opened by switching to replace the blocked nozzle, so that the injection operation can be carried out smoothly.

[0111] In addition, the operating method of the multi-stage liquid injection device can realize continuous adjustment of the liquid injection classification load, so that the injection amount of the injection agent in the gas phase medium pipeline meets the requirements of the liquid injection process.

[0112] Although the embodiments of the present invention have been shown and described, it is understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the protection scope of the present invention is defined by the attached claims and their equivalents.

Claims

1. A multi-stage liquid injection device with continuously adjustable graded load, characterized in that: The invention comprises an outer tube fixed on a gas phase medium pipeline to be injected with an injection agent, and an inner tube capable of rotating without gap in the outer tube, wherein one end of the inner tube or / and the outer tube located in the gas phase medium pipeline is closed; the outer tube is connected with a liquid inlet pipe and at least two nozzles, the liquid inlet pipe is located outside the gas phase medium pipeline and is used to pass the injection agent into the inner tube, and the nozzle is located in the gas phase medium pipeline and is used to inject the injection agent into the gas phase medium pipeline; a plurality of liquid outlets corresponding to the nozzles are arranged along the circumference of the inner tube, and the number of liquid outlets corresponding to each nozzle may be the same or different; the inner tube has a plurality of rotation positions, and when the rotation positions are rotated, each nozzle is either connected or not connected with the corresponding liquid outlet, so that the multi-stage injection device has a plurality of injection states.

2. A multi-stage liquid injection device with continuously adjustable graded load as claimed in claim 1, characterized in that: A rotation actuator is connected to the end of the inner tube located outside the gas medium pipeline, and the rotation actuator is used to realize the rotation of the inner tube; a dynamic sealing structure is arranged at the end of the outer tube located outside the gas medium pipeline, and the dynamic sealing structure is used to realize dynamic sealing between the inner tube and the outer tube.

3. A multi-stage liquid injection device with continuously adjustable graded load as claimed in claim 2, characterized in that: The dynamic sealing structure is mainly composed of a stuffing box, packing and a gland, wherein the stuffing box is sealed and fixed at the end of the outer tube.

4. A multi-stage liquid injection device with continuously adjustable graded load as claimed in claim 3, characterized in that: A threaded connection structure is provided between the bottom of the stuffing box and the inner pipe.

5. A multi-stage liquid injection device with continuously adjustable graded load as claimed in claim 3, characterized in that: A rotation indicating disk is fixed on the gland, and a rotation pointer is fixed on the inner tube.

6. A multi-stage liquid injection device with continuously adjustable graded load as claimed in claim 5, characterized in that: A limiting mechanism is also arranged on the pressure cover, and the limiting mechanism is used for limiting the rotation of the index pointer within one circle.

7. A multi-stage liquid injection device with continuously adjustable graded load as claimed in claim 1, characterized in that: The nozzles are arranged along the axial direction of the outer tube.

8. A multi-stage liquid injection device with continuously adjustable graded load as claimed in claim 7, characterized in that: The outer tube is connected with two nozzles, each nozzle corresponds to two liquid outlets, and the inner tube has four rotation positions: fully closed, single open I, single open II, and fully open.

9. A multi-stage liquid injection device with continuously adjustable graded load as claimed in claim 7, characterized in that: The outer tube is connected with three nozzles, each nozzle corresponds to four liquid outlets, and the inner tube has eight rotation positions: fully closed, single open I, single open II, single open III, double open I, double open II, double open III, and fully open.

10. A multi-stage liquid injection device with continuously adjustable graded load as claimed in claim 1, characterized in that: The nozzles are arranged along the circumference of the outer tube.

11. A multi-stage liquid injection device with continuously adjustable graded load as claimed in claim 10, characterized in that: Two nozzles are arranged along the circumference of the outer tube, and the inner tube has four rotation positions: fully closed, single open I, fully open, and single open II.

12. A multi-stage liquid injection device with continuously adjustable graded load as claimed in claim 10, characterized in that: Three nozzles are arranged along the circumference of the outer tube, and the inner tube has six rotation positions, namely, fully closed, single open I, double open I, fully open, double open II, and single open II.

13. A multi-stage liquid injection device with continuously adjustable graded load as claimed in claim 1, characterized in that: There are at least three nozzles, which are arranged along the circumference and axial direction of the outer tube.

14. A multi-stage liquid injection device with continuously adjustable graded load as claimed in claim 1, characterized in that: The opening sizes of the nozzles may be the same or different.

15. An operating method applied to the multi-stage liquid injection device according to any one of claims 1 to 14, characterized in that: The inner tube is rotated so that the injection amount of the injection agent in the gas medium pipeline meets the requirements of the liquid injection process.

16. An operating method as claimed in claim 15, characterized in that: A flow meter is installed at the front end of the liquid inlet pipe, and the injection amount of the injection agent in the gas phase medium pipeline is monitored by the flow meter; A. If the injection volume of the injection agent is lower than the injection process requirements, the inner tube is opened and rotated to allow more nozzles to participate in the injection; B. If the injection volume of the injection agent is higher than the injection process requirements, the inner tube is reduced and rotated to allow fewer nozzles to participate in the injection; C. If the injection volume does not match the current position, it is judged that the nozzle is blocked. At this time, the inner tube is turned to a position with the same opening.

17. An operating method according to claim 16, characterized in that: When fine-tuning the injection volume of the injection agent, the inner tube can be slightly rotated to increase or decrease the overlap between the nozzle and the corresponding liquid outlet.

18. An operating method according to claim 16, characterized in that: When the opening sizes of the nozzles are different, the nozzle with a large opening can be replaced by the nozzle with a small opening by rotating the inner tube to increase the injection amount of the injection; or the nozzle with a small opening can be replaced by the nozzle with a large opening to reduce the injection amount of the injection.

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