A low-temperature fine-powder granular oil polymer drag-reducing agent crushing system and low-temperature crushing process

Abstract

This invention discloses a low-temperature fine-powder granular oil polymer drag-reducing agent pulverizing system and low-temperature pulverizing process. The system includes a room-temperature nitrogen tank, a feeding chamber mechanism, a screw conveyor mechanism, a pulverizer, and a hydrocyclone separator connected in sequence. The screw conveyor mechanism, pulverizer, and hydrocyclone separator are externally covered by a sealed chamber, which is connected to the liquid nitrogen tank. The lower outlet of the hydrocyclone separator is connected to a collection tank, and its upper outlet is connected to an induced draft fan. This invention precisely controls the ratio of granular drag-reducing agent and powdered release agent entering the pulverizer, improving the coating effect. The pulverizing system can achieve a fully enclosed pulverizing process, effectively shielding moisture in the air, and can precisely control the ratio of granular drag-reducing agent and release agent, improving the coating effect of the release agent, and thus improving the stability of the powdered drag-reducing agent.

Description

Technical Field

[0001] This invention belongs to the field of low-temperature pulverization technology of oil polymer drag reducers, specifically relating to a low-temperature fine powder pulverization system and low-temperature pulverization process for oil polymer drag reducers. Background Technology

[0002] Oil-based polymer drag reducers are widely used in crude oil pipeline transportation and other fields. The synthesized drag reducers are generally large viscoelastic materials that need to be immersed in cryogenic liquid nitrogen to reach a glassy state. They are then coarsely powdered into granular polymer drag reducers, and further finely powdered to obtain powdered drag reducers. Currently, oil-based polymer drag reducers are not pulverized in a closed environment. Moisture in the air comes into contact with the pulverized powdered drag reducer, causing it to agglomerate and affecting the uniformity and stability of the subsequent suspension formulation. Most cryogenic pulverization devices inject cryogenic liquid nitrogen together with the granular drag reducer and powdered release agent into the pulverizer. This process, due to density differences and the vaporization of liquid nitrogen, makes it impossible to control the ratio of drag reducer to release agent, affecting the coating effect of the release agent.

[0003] Therefore, in order to improve the coating effect of the release agent and prevent the powdered drag reducer from agglomerating, it is necessary to precisely control the ratio of granular drag reducer and powdered release agent entering the pulverizer, while shielding it from moisture in the air. Summary of the Invention

[0004] This invention is proposed to solve the problems existing in the prior art, and its purpose is to provide a low-temperature fine powder granular oil polymer drag-reducing agent pulverizing system and low-temperature pulverizing process.

[0005] This invention is achieved through the following technical solution:

[0006] A low-temperature fine powder granular oil polymer drag-reducing agent pulverizing system includes a room-temperature nitrogen tank, a feeding chamber mechanism, a screw conveyor mechanism, a pulverizer, and a hydrocyclone separator connected in sequence; the screw conveyor mechanism, pulverizer, and hydrocyclone separator are externally covered by a sealed chamber, which is connected to the liquid nitrogen tank; the lower outlet of the hydrocyclone separator is connected to a collection tank, and its upper outlet is connected to an induced draft fan; the feeding chamber mechanism includes a drag-reducing agent feeding chamber and a release agent feeding chamber arranged in parallel; the screw conveyor mechanism includes a drag-reducing agent screw conveyor connected to the outlet of the drag-reducing agent feeding chamber and a release agent screw conveyor connected to the outlet of the release agent feeding chamber.

[0007] In the above technical solution, the drag-reducing agent feeding chamber is provided with a drag-reducing agent inlet; the release agent feeding chamber is provided with a release agent inlet.

[0008] In the above technical solution, the outlet of the ambient temperature nitrogen tank is connected to a nitrogen output pipeline. The nitrogen output pipeline includes a main nitrogen pipeline and two parallel nitrogen branch pipelines. One end of the main nitrogen pipeline is connected to the ambient temperature nitrogen tank, and the other end is connected to the two nitrogen branch pipelines through a tee. The first nitrogen branch pipeline is connected to the crusher, and the second nitrogen branch pipeline is connected to the drag-reducing agent feed chamber and the separator feed chamber through two tertiary branch pipelines, respectively.

[0009] In the above technical solution, an intake valve No. I is installed on the first nitrogen branch line; an intake valve No. II is installed on the second nitrogen branch line.

[0010] In the above technical solution, the opening degree of intake valve II is less than that of intake valve I.

[0011] In the above technical solution, the collecting tank and the cyclone separator are sealed together, and the top surface of the collecting tank is provided with an air outlet.

[0012] In the above technical solution, the outlet of the induced draft fan is connected to a gas output pipeline, which includes a main gas output pipeline and two parallel gas output branch pipelines. One end of the main gas output pipeline is connected to the outlet of the induced draft fan, and the other end is connected to the two gas output branch pipelines. The first gas output branch pipeline is connected to the sealed chamber, and the second gas output branch pipeline is connected to the upper outlet of the cyclone separator.

[0013] In the above technical solution, the sealed chamber is a hollow closed box structure, and two parallel convex strips are provided on the bottom surface of the box, forming an opening groove.

[0014] In the above technical solution, one end of the opening groove corresponds to the connection between the sealed chamber and the liquid nitrogen tank.

[0015] A low-temperature pulverization process for a low-temperature fine powder granular oil polymer drag-reducing agent pulverization system includes the following steps:

[0016] S1. Weigh the granular drag-reducing agent and the separating agent according to the ratio, and put them into the feeding chamber mechanism;

[0017] S2. Open the liquid nitrogen tank and supply liquid nitrogen to the sealed chamber;

[0018] S3. Open the No. I inlet valve between the ambient temperature nitrogen tank and the crusher;

[0019] S4. Start the induced draft fan;

[0020] S5. Open the No. 2 inlet valve on the pipeline connecting the ambient temperature nitrogen tank and the feeding chamber mechanism;

[0021] S6. Start the crusher;

[0022] S7. Simultaneously start the drag-reducing agent screw conveyor and the release agent screw conveyor;

[0023] S8. Collect the crushed powdered drag-reducing agent through a collection tank.

[0024] The beneficial effects of this invention are:

[0025] This invention provides a low-temperature fine powder granular oil polymer drag-reducing agent pulverizing system and low-temperature pulverizing process. It precisely controls the ratio of granular drag-reducing agent and powdered release agent entering the pulverizer to improve the coating effect. The pulverizing system can achieve a fully enclosed pulverizing process, effectively shielding moisture in the air, and can precisely control the ratio of granular drag-reducing agent and release agent, improving the coating effect of the release agent, thereby improving the stability of the powdered drag-reducing agent. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the structure of the present invention;

[0027] Figure 2 This is a structural schematic diagram of the present invention (the sealed chamber is not shown);

[0028] Figure 3 This is a schematic diagram of the assembly structure of the cyclone separator and the collection tank in this invention;

[0029] Figure 4 This is a schematic diagram of the structure of the sealed chamber in this invention;

[0030] in:

[0031] 1. Ambient temperature nitrogen tank; 2. Drag reducer feed chamber; 3. Separator feed chamber; 4. Drag reducer screw conveyor; 5. Separator screw conveyor; 6. Crusher; 7. Cyclone separator; 8. Collection tank; 9. Exhaust fan; 10. Liquid nitrogen tank; 11. Sealed chamber; 12. Gas output pipeline; 13. Nitrogen output pipeline; 21. Drag reducer feed inlet; 31. Separator feed inlet; 81. Vent; 111. Opening slot; 131. No. I inlet valve; 132. No. II inlet valve.

[0032] For those skilled in the art, other related figures can be obtained from the above figures without any creative effort. Detailed Implementation

[0033] To enable those skilled in the art to better understand the technical solution of the present invention, the technical solution of the present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0034] like Figure 1 , 2As shown, a low-temperature fine powder granular oil polymer drag-reducing agent pulverizing system includes a room-temperature nitrogen tank 1, a feeding chamber mechanism, a screw conveyor mechanism, a pulverizer 6, and a hydrocyclone separator 7 connected in sequence; the screw conveyor mechanism, the pulverizer 6, and the hydrocyclone separator 7 are covered by a sealed chamber 11, which is connected to a liquid nitrogen tank 10; the lower outlet of the hydrocyclone separator 7 is connected to a collection tank 8, and its upper outlet is connected to an induced draft fan 9;

[0035] The feeding chamber mechanism includes a drag-reducing agent feeding chamber 2 and a release agent feeding chamber 3 arranged in parallel; the drag-reducing agent feeding chamber 2 is provided with a drag-reducing agent inlet 21; the release agent feeding chamber 3 is provided with a release agent inlet 31; the drag-reducing agent feeding chamber 2 and the release agent feeding chamber 3 respectively deliver drag-reducing agent and release agent to the pulverizer 6 according to the set ratio;

[0036] The spiral conveying mechanism includes a drag-reducing agent spiral conveyor 4 connected to the outlet of the drag-reducing agent feed chamber 2 and a release agent spiral conveyor 5 connected to the outlet of the release agent feed chamber 3. The drag-reducing agent spiral conveyor 4 and the release agent spiral conveyor 5 are adjusted according to the set ratio to achieve precise control of the ratio of granular drag-reducing agent and release agent entering the pulverizer. Compared with the traditional method of liquid nitrogen, granular drag-reducing agent and powdered release agent entering the pulverizer together, the powdered drag-reducing agent after pulverization is better coated by the powdered release agent, avoiding the agglomeration phenomenon caused by poor coating effect, improving the coating effect of the release agent, and improving the stability after crushing.

[0037] The outlet of the ambient temperature nitrogen tank 1 is connected to a nitrogen output pipeline 13. The nitrogen output pipeline 13 includes a main nitrogen pipeline and two parallel nitrogen branch pipelines. One end of the main nitrogen pipeline is connected to the ambient temperature nitrogen tank 1, and the other end is connected to the nitrogen branch pipelines via a tee. The first nitrogen branch pipeline is connected to the crusher 6, and the second nitrogen branch pipeline is connected to the drag-reducing agent inlet chamber 2 and the release agent inlet chamber 3 via two tertiary branch pipelines. An inlet valve 131 is installed on the first nitrogen branch pipeline, which is used as a suction fan 9 to draw out the exhaust pipe. The gas source is a nitrogen gas source; a second nitrogen gas branch line is equipped with a No. II inlet valve 132, which is used to balance the pressure of the drag-reducing agent feeding chamber 2 and the isolation agent feeding chamber 3 during the feeding process; the opening degree of the No. II inlet valve 132 is much smaller than that of the No. I inlet valve 131; through the above-mentioned connection of the output pipeline of the room temperature nitrogen tank, it is ensured that the gas entering the crusher 6 is completely nitrogen gas, without moisture, effectively shielding the moisture in the air, avoiding the agglomeration phenomenon caused by moisture, and effectively improving the stability of the drag-reducing agent powder after crushing;

[0038] The collecting tank 8 and the cyclone separator 7 are sealed together, and the top surface of the collecting tank 8 is provided with an air outlet 81. During the crushing process, the cyclone separator 7 separates the gas and solid, and the powdered drag-reducing agent covering the isolator falls into the collecting tank 8. The gas in the collecting tank 8 is discharged through the air outlet 81. With the above-mentioned collecting tank configuration, it can be ensured that the pressure inside the collecting tank 8 is the same as the atmospheric pressure, which does not affect the gas-solid separation effect of the cyclone separator 7, nor does it affect the isolation of moisture in the air. At the same time, both the collecting tank and the cyclone separator are in a low-temperature environment, which ensures that the powdered drag-reducing agent after crushing will not agglomerate due to temperature rise, thus improving the stability after crushing.

[0039] The outlet of the induced draft fan 9 is connected to the gas output pipeline 12. The gas output pipeline 12 includes a main gas output pipeline and two parallel gas output branch pipelines. One end of the main gas output pipeline is connected to the outlet of the induced draft fan 9, and the other end is connected to the two gas output branch pipelines. The first gas output branch pipeline is connected to the sealed chamber 11, and the second gas output branch pipeline is connected to the upper outlet of the cyclone separator 7.

[0040] The sealed chamber 11 is a hollow, enclosed box structure. Two parallel raised strips are arranged on the bottom surface of the chamber, forming an opening groove 111. One end of the opening groove 111 corresponds to the connection between the sealed chamber 11 and the liquid nitrogen tank 10. Liquid nitrogen flows along the opening groove after entering the sealed chamber 11. This sealed chamber design ensures that the liquid nitrogen does not come into contact with the particulate drag-reducing agent and powdered separator. The liquid nitrogen only provides a low-temperature environment. The vaporization of the liquid nitrogen can promptly remove the heat generated within the sealed chamber 11, including the heat from the screw conveyor conveying the material, the heat generated by the crusher, the heat generated by the screw separator, and the heat generated when the material falls into the collection tank. This maintains the drag-reducing agent in a low-temperature environment throughout the crushing, separation, and collection process, avoiding complex flow caused by liquid nitrogen vaporization, which could affect the crushing and coating effect and improve the stability after crushing. Since the screw conveyor, crusher 6, and cyclone separator 7 are all located within the sealed chamber 11, and the sealed chamber 11 is airtight, the safety of personnel operation is improved.

[0041] Example 2

[0042] Based on the pulverizing system of Example 1, a low-temperature fine powder granular oil polymer drag-reducing agent pulverizing process includes the following steps:

[0043] S1. The granular drag-reducing agent after weighing the coarse powder, and the corresponding weight of the release agent according to the formula ratio, are respectively fed into the drag-reducing agent feed chamber 2 and the release agent feed chamber 3 through the drag-reducing agent feed port 21 and the release agent feed port 31, and then the drag-reducing agent feed port 21 and the release agent feed port 31 are closed.

[0044] In this embodiment, the granular polymer after coarse powder needs to remain in a glassy state. Closing the feed inlet can shield the granular polymer from moisture in the air and reduce the heating rate of the granular polymer.

[0045] S2. Open the liquid nitrogen tank 10 and supply liquid nitrogen to the sealed chamber 11 to maintain the overall low temperature;

[0046] In this embodiment, the opening speed of the liquid nitrogen tank 10 can be controlled by an electric pump. The liquid nitrogen delivery speed needs to be increased slowly, and a constant speed can be maintained after the set temperature is reached.

[0047] S3. Open the No. I inlet valve 131 on the pipeline connecting the room temperature nitrogen tank 1 and the crusher 6 to provide a nitrogen source;

[0048] In this embodiment, after opening the No. I air inlet valve 131, room temperature nitrogen will quickly fill the pulverizer and the subsequent pipeline under pressure, ensuring that there is no moisture in the pipeline when pulverization begins.

[0049] S4. Start the induced draft fan 9 to remove the original air from the pipeline;

[0050] In this embodiment, the conveying capacity of the induced draft fan 9 is maintained at 250m³. 3 Approximately / h;

[0051] Before crushing, open the No. I air inlet valve 131 between the ambient temperature nitrogen tank 1 and the crusher 6, and then start the induced draft fan 9 to ensure that the gas entering the crusher 6 is completely nitrogen and free of moisture. This effectively shields the air from moisture, avoids agglomeration caused by moisture, and improves the stability after crushing.

[0052] S5. Open the No. II inlet valve 132 on the pipeline connecting the ambient temperature nitrogen tank 1 and the feeding chamber mechanism;

[0053] In this embodiment, the opening degree of intake valve 132 is approximately 10% of the opening degree of intake valve 131.

[0054] S6. Start the crusher 6;

[0055] S7. Simultaneously start the drag-reducing agent screw conveyor (4) and the release agent screw conveyor (5);

[0056] In this embodiment, drag-reducing agent and release agent are delivered separately according to the set ratio, which can precisely control the ratio of the two entering screw conveyors 4 and 5, and ensure the coating effect of the release agent.

[0057] S8. Collect the pulverized powdered drag-reducing agent through collection tank 8;

[0058] In this embodiment, the collection tank 8 and the cyclone separator 7 are sealed together, and the collection tank 8 is in a low-temperature environment to ensure the stability of the powdered drag-reducing agent. After the crushing is completed, the collection tank 8 is transferred to a low-temperature storage room to maintain the low temperature for the next step of preparing the suspension.

[0059] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0060] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art will understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0061] The applicant declares that the above description is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Those skilled in the art should understand that any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention fall within the protection and disclosure scope of the present invention.

Claims

1. A low-temperature fine powder granular oil polymer drag-reducing agent pulverizing system, characterized in that: The system includes a room temperature nitrogen tank (1), a feeding chamber mechanism, a screw conveyor mechanism, a pulverizer (6), and a cyclone separator (7) connected in sequence. The screw conveyor mechanism, the pulverizer (6), and the cyclone separator (7) are covered by a sealed chamber (11), which is connected to the liquid nitrogen tank (10). The lower outlet of the cyclone separator (7) is connected to a collection tank (8), and its upper outlet is connected to an induced draft fan (9). The feeding chamber mechanism includes a drag-reducing agent feeding chamber (2) and a release agent feeding chamber (3) arranged in parallel. The screw conveyor mechanism includes a drag-reducing agent screw conveyor (4) connected to the outlet of the drag-reducing agent feeding chamber (2) and a release agent screw conveyor (5) connected to the outlet of the release agent feeding chamber (3). The outlet of the ambient temperature nitrogen tank (1) is connected to the nitrogen output pipeline (13). The nitrogen output pipeline (13) includes a main nitrogen pipeline and two parallel nitrogen branch pipelines. One end of the main nitrogen pipeline is connected to the ambient temperature nitrogen tank (1), and the other end is connected to the two nitrogen branch pipelines through a tee. The first nitrogen branch pipeline is connected to the crusher (6), and the second nitrogen branch pipeline is connected to the drag reducing agent feed chamber (2) and the separator feed chamber (3) through two tertiary branch pipelines. The collecting tank (8) is sealed to the cyclone separator (7), and the top surface of the collecting tank (8) is provided with an air outlet (81); the collecting tank (8) is in a low temperature environment; The sealed chamber (11) has two parallel protrusions on its bottom surface, forming an opening groove (111); one end of the opening groove (111) corresponds to the connection between the sealed chamber (11) and the liquid nitrogen tank (10).

2. The low-temperature fine powder granular oil polymer drag-reducing agent pulverizing system according to claim 1, characterized in that: The drag-reducing agent feed chamber (2) is provided with a drag-reducing agent inlet (21); the release agent feed chamber (3) is provided with a release agent inlet (31).

3. The low-temperature fine powder granular oil polymer drag-reducing agent pulverizing system according to claim 1, characterized in that: Inlet valve I (131) is installed on the first nitrogen branch line; inlet valve II (132) is installed on the second nitrogen branch line.

4. The low-temperature fine powder granular oil polymer drag-reducing agent pulverizing system according to claim 3, characterized in that: The opening degree of intake valve II (132) is less than that of intake valve I (131).

5. The low-temperature fine powder granular oil polymer drag-reducing agent pulverizing system according to claim 1, characterized in that: The outlet of the induced draft fan (9) is connected to the gas output pipeline (12). The gas output pipeline (12) includes a main gas output pipeline and two parallel gas output sub-pipelines. One end of the main gas output pipeline is connected to the outlet of the induced draft fan (9), and the other end is connected to the two gas output sub-pipelines. The first gas output sub-pipeline is connected to the sealed chamber (11), and the second gas output sub-pipeline is connected to the upper outlet of the cyclone separator (7).

6. The low-temperature fine powder granular oil polymer drag-reducing agent pulverizing system according to claim 1, characterized in that: The sealed chamber (11) is a hollow, closed box structure.

7. A low-temperature pulverization process using the low-temperature fine powder granular oil polymer drag-reducing agent pulverization system described in any one of claims 1 to 6, characterized in that: Includes the following steps: S1. Weigh the granular drag-reducing agent and the release agent according to the ratio, and put them into the feeding chamber mechanism, then close the drag-reducing agent inlet and the release agent inlet; S2. Open the liquid nitrogen tank and supply liquid nitrogen to the sealed chamber; S3. Open the No. I inlet valve between the ambient temperature nitrogen tank and the crusher; S4. Start the exhaust fan to remove the original air from the pipeline; S5. Open the No. 2 inlet valve on the pipeline connecting the ambient temperature nitrogen tank and the feeding chamber mechanism; S6. Start the crusher; S7. Simultaneously start the drag-reducing agent screw conveyor and the release agent screw conveyor; S8. Collect the crushed powdered drag-reducing agent through a collection tank.

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