A fluid mixer
By designing a confluence and mixing section structure in the fluid mixer, with the inner pipe inlet located outside the branch pipe and the outlet located inside the mixing section, hot and cold fluids flow in parallel without temperature difference in the confluence section and are uniformly mixed after entering the mixing section. This solves the problems of cracking of the T-joint weld and poor mixing effect, and achieves the safety and uniformity of fluid mixing.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- CHINA PETROLEUM & CHEMICAL CORP
- Filing Date
- 2025-08-25
- Publication Date
- 2026-07-31
AI Technical Summary
In existing ethylene oxide-ethylene glycol (EOEG) units, during the mixing process of the bottom liquid in the EO refining tower and the feed heat exchange, the weld at the tee is prone to cracking and the mixing effect is poor.
It adopts a structure of a confluence section and a mixing section. The inlet end of the inner tube is located outside the horizontal or vertical branch pipe, and the outlet end extends into the mixing section. The hot and cold fluids flow in parallel in the confluence section but do not exchange temperature differences until they enter the mixing section for mixing. Uniform mixing is achieved through a static mixer.
This avoids fluid leakage caused by weld cracking, improves the mixing effect of hot and cold fluids, and ensures the uniformity and safety of mixing.
Smart Images
Figure CN224573554U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of petrochemicals, and specifically relates to a fluid mixer. Background Technology
[0002] In existing ethylene oxide-ethylene glycol (EOEG) units, the heat exchange between the bottom liquid of the EO refining tower and the feed is controlled by a bypass. The liquid at the outlet of the bottom pump of the EO refining tower is mixed with the fluid in the bottom of the EO refining tower after being cooled by the heat exchanger. The existing structure connects the main line, bypass line and mixing line through a tee, and the tee is welded to the main line, bypass line and mixing line respectively. At the mixing point between the bypass and main lines of the bottom liquid, the weld often cracks and leaks due to the thermal stress caused by the convergence of hot and cold fluids during the mixing process.
[0003] Simulations revealed poor mixing during the T-junction mixing process, particularly at the weld between the T-junction and the main road, where the temperature difference was significant, leading to pipeline corrosion and weld cracking. Utility Model Content
[0004] The purpose of this invention is to solve the problems existing in the prior art and provide a fluid mixer that solves the problems of weld cracking and poor mixing effect in the existing three-way mixing process.
[0005] This utility model is achieved through the following technical solution:
[0006] This invention provides a fluid mixer, comprising a confluence section and a mixing section.
[0007] The manifold includes a horizontal main pipe and a vertical branch pipe that is perpendicularly connected to the horizontal main pipe, and the horizontal main pipe is connected to the mixing section;
[0008] An inner tube is provided inside the horizontal main pipe or vertical branch pipe. The inner tube includes an inlet end and an outlet end. The inlet end of the inner tube is located outside the horizontal main pipe or vertical branch pipe, and the outlet end extends into the mixing section.
[0009] The further improvement of this utility model is as follows:
[0010] When the horizontal main pipe is provided with the inner pipe, both the inlet end and the outlet end of the inner pipe extend out of the horizontal main pipe.
[0011] The further improvement of this utility model is as follows:
[0012] A filling layer is provided in the annular space formed by the inner tube and the horizontal main tube;
[0013] The filling layer is provided on the side near the inlet end of the inner tube.
[0014] The further improvement of this utility model is as follows:
[0015] When the vertical branch pipe is provided with the inner pipe, the inner pipe includes a vertical inner pipe provided in the vertical branch pipe and a horizontal inner pipe provided in the horizontal main pipe, and the vertical inner pipe and the horizontal inner pipe are connected by a bend.
[0016] The further improvement of this utility model is as follows:
[0017] The end of the vertical inner tube furthest from the horizontal inner tube is the inlet end, which extends out of the vertical branch tube.
[0018] The further improvement of this utility model is as follows:
[0019] The end of the horizontal inner tube furthest from the vertical inner tube is the outlet end, which extends into the mixing section.
[0020] The further improvement of this utility model is as follows:
[0021] A filling layer is provided in the annular space formed by the vertical inner tube and the vertical branch tube.
[0022] The further improvement of this utility model is as follows:
[0023] The mixing section is a static mixer.
[0024] The further improvement of this utility model is as follows:
[0025] The length of the inner tube extending into the static mixer is 3 to 5 times the diameter of the inner tube.
[0026] The further improvement of this utility model is as follows:
[0027] The distance between the outlet end of the inner pipe and the mixing component inside the static mixer shall not be less than the inner diameter of the mixer pipe.
[0028] Compared with the prior art, the beneficial effects of this utility model are:
[0029] In this invention, when an inner pipe is installed inside the horizontal main pipe, the hot fluid enters the inner pipe through the inlet end, and the cold fluid enters the annulus between the inner pipe and the horizontal main pipe through the vertical branch pipe. At this time, the hot and cold fluids flow in parallel until the hot fluid flows to the outlet end of the inner pipe. The hot and cold fluids then enter the mixing section, where they begin to mix. Since there is no exchange of hot and cold fluids in the confluence section, there is no thermal stress, which can prevent fatigue failure at the welding point and thus prevent weld cracking, thereby preventing fluid leakage. Because the outlet end of the inner pipe extends into the mixing section, when the hot and cold fluids flow to the outlet end of the inner pipe, the mixing section further mixes and homogenizes the hot and cold fluids, improving the mixing effect and preventing fluid leakage.
[0030] In this invention, when an inner pipe is installed in the vertical branch pipe, the cold fluid enters the horizontal main pipe through the inlet of the horizontal main pipe, and the hot fluid enters the inner pipe through the inlet end of the inner pipe. At this time, the cold and hot fluids flow in parallel until the hot fluid flows to the outlet end of the inner pipe. The cold and hot fluids then enter the mixing section, where mixing begins. Since there is no exchange of cold and hot fluids in the confluence section, there is no thermal stress, which can avoid fatigue failure at the welding point and thus prevent weld cracking, thereby preventing fluid leakage. Since the outlet end of the inner pipe extends into the mixing section in this invention, when the cold and hot fluids flow to the outlet end of the inner pipe, the mixing section further mixes and homogenizes the cold and hot fluids, improving the mixing effect and preventing fluid leakage.
[0031] In this invention, an inner pipe is installed inside the horizontal main pipe or vertical branch pipe. The inner pipe includes an inlet end and an outlet end. The inlet end of the inner pipe is located outside the horizontal main pipe or vertical branch pipe, and the outlet end extends into the mixing section. This ensures that there is no exchange of hot and cold fluids within the confluence section, eliminating thermal stress and preventing fatigue failure at the welding points that could lead to weld cracking and fluid leakage. Since the outlet end of the inner pipe extends into the mixing section, when the hot and cold fluids flow to the outlet end of the inner pipe, the mixing section further mixes and homogenizes the hot and cold fluids, improving the mixing effect and preventing fluid leakage. Attached Figure Description
[0032] Figure 1 This is a schematic diagram of the structure of a fluid mixer according to the present invention;
[0033] Figure 2 This is a schematic diagram of another fluid mixer in this utility model.
[0034] In the picture,
[0035] 1. Level Supervisor;
[0036] 2. Vertical division of responsibilities;
[0037] 3. Mixing section;
[0038] 4. Inner tube;
[0039] 5. Entrance end;
[0040] 6. Export end;
[0041] 7. Vertical inner tube;
[0042] 8. Horizontal inner tube;
[0043] 9. Fill layer. Detailed Implementation
[0044] The present invention will now be described in further detail with reference to the accompanying drawings:
[0045]
Example 1
[0046] like Figure 1 and 2 As shown, this utility model provides a fluid mixer, including a confluence section and a mixing section.
[0047] The manifold includes a horizontal main pipe 1 and a vertical branch pipe 2 that is vertically connected to the horizontal main pipe 1. The horizontal main pipe 1 is connected to the mixing section 3.
[0048] An inner pipe 4 is provided inside the horizontal main pipe 1 or the vertical branch pipe 2. The inner pipe 4 includes an inlet end 5 and an outlet end 6. The inlet end 5 of the inner pipe 4 is located outside the horizontal main pipe 1 or the vertical branch pipe 2, and the outlet end 6 extends into the mixing section 3.
[0049] The inlet end 5 of the inner pipe is connected to one end of the horizontal main pipe 1 or the vertical branch pipe 2 by flange welding. The side of the inner pipe 4 near the outlet end is connected to the other end of the horizontal main pipe 1 by flange welding. The horizontal main pipe 1 is connected to the mixing section 3 by flange welding.
[0050] like Figure 1 As shown, when the inner pipe 4 is installed inside the horizontal main pipe 1, the hot fluid enters the inner pipe 4 through the inlet end 5 of the inner pipe, and the cold fluid enters the annulus between the inner pipe 4 and the horizontal main pipe 1 through the vertical branch pipe 2. At this time, the hot and cold fluids flow in parallel until the hot fluid flows to the outlet end 6 of the inner pipe. The hot and cold fluids then enter the mixing section 3, where they begin to mix. Since there is no exchange of hot and cold fluids in the confluence section, there is no thermal stress, which can prevent fatigue failure at the welding point and thus prevent weld cracking, thereby preventing fluid leakage. Since the outlet end 6 of the inner pipe extends into the mixing section 3 in this invention, when the hot and cold fluids flow to the outlet end 6 of the inner pipe, the mixing section 3 further mixes and homogenizes the hot and cold fluids, improving the mixing effect and preventing fluid leakage.
[0051] like Figure 2 As shown, when the vertical branch pipe 2 is equipped with an inner pipe 4, the cold fluid enters the horizontal main pipe 1 through the inlet of the horizontal main pipe 1, and the hot fluid enters the inner pipe 4 through the inlet end 5 of the inner pipe 4. At this time, the cold and hot fluids flow in parallel until the hot fluid flows to the outlet end 6 of the inner pipe. The cold and hot fluids then enter the mixing section 3, where mixing begins. Since there is no exchange of cold and hot fluids in the confluence section, there is no temperature difference stress, which can avoid fatigue failure at the welding point and thus prevent weld cracking, thereby preventing fluid leakage. Since the outlet end 6 of the inner pipe extends into the mixing section 3 in this utility model, when the cold and hot fluids flow to the outlet end 6 of the inner pipe, the mixing section 3 further mixes and homogenizes the cold and hot fluids, improving the mixing effect and preventing fluid leakage.
[0052]
Example 2
[0053] like Figure 1 As shown, when an inner tube 4 is installed inside the horizontal main pipe 1, the inlet end 5 and the outlet end 6 of the inner tube 4 extend out of the horizontal main pipe 1. A filling layer 9 is installed in the annular space formed by the inner tube 4 and the horizontal main pipe 1. The filling layer 9 is installed on the side close to the inlet end 5 of the inner tube. The material of the filling layer 9 is polytetrafluoroethylene, which has corrosion resistance, wear resistance, high temperature resistance, high tensile strength and excellent flexibility.
[0054] In this embodiment, a filling layer 9 is provided in the annulus formed by the inner pipe 4 and the horizontal main pipe 1, and the filling layer 9 is provided on the side close to the inlet end 5 of the inner pipe. When the cold fluid enters the annulus between the inner pipe 4 and the horizontal main pipe 1 through the vertical branch pipe 2, it can prevent the cold fluid from flowing into the inlet side of the inner pipe 4 and the horizontal main pipe 1 and causing corrosion and cracking of the welded part, thus preventing fluid leakage.
[0055]
Example 3
[0056] like Figure 2 As shown, when an inner pipe 4 is installed inside the vertical branch pipe 2, the inner pipe 4 includes a vertical inner pipe 7 installed inside the vertical branch pipe 2 and a horizontal inner pipe 8 installed inside the horizontal main pipe 1. The vertical inner pipe 7 and the horizontal inner pipe 8 are connected by a bend. The end of the vertical inner pipe 7 away from the horizontal inner pipe 8 is the inlet end 5, which extends out of the vertical branch pipe 2. The end of the horizontal inner pipe 8 away from the vertical inner pipe 7 is the outlet end 6, which extends into the mixing section 2.
[0057] Cold fluid enters horizontal main pipe 1 through the inlet, while hot fluid enters inner pipe 4 through inlet end 5. At this time, the cold and hot fluids flow concurrently until the hot fluid reaches outlet end 6 of inner pipe, where they enter mixing section 3. Mixing only begins in mixing section 3. Since there is no exchange of cold and hot fluids in the confluence section, there is no thermal stress, which can prevent fatigue failure at the welding point and thus prevent weld cracking, thereby avoiding fluid leakage. Since outlet end 6 of inner pipe extends into mixing section 3, when the cold and hot fluids reach outlet end 6 of inner pipe, they are further mixed and homogenized through mixing section 3, improving the mixing effect and preventing fluid leakage.
[0058] Preferably, the inner tube is integrally formed.
[0059]
Example 4
[0060] See Example 3, which differs from Example 3 in that, as Figure 2 As shown, a filling layer 9 is provided in the annular space formed by the vertical inner tube 7 and the vertical branch tube 2. The filling layer 9 is made of polytetrafluoroethylene, which has the characteristics of corrosion resistance, wear resistance, high temperature resistance, high tensile strength, and excellent flexibility.
[0061] In this embodiment, a filling layer 9 is provided in the annulus formed by the vertical inner pipe 7 and the vertical branch pipe 2. When the hot fluid enters the inner pipe 4 through the vertical inner pipe 7, it can prevent the hot fluid from corroding the welded joint of the vertical inner pipe 7 and the vertical branch pipe 2 and causing cracks, thus preventing fluid leakage.
[0062]
Example 5
[0063] The mixing section 3 is a static mixer. The horizontal main pipe 1 is connected to the inlet end of the static mixer by flange welding. Preferably, in this embodiment, the static mixer is an SMV type mixer.
[0064] In this invention, the outlet end 6 of the inner tube extends into the static mixer. When the hot and cold fluids flow to the outlet end 6 of the inner tube, the static mixer will further mix the hot and cold fluids evenly, improve the mixing effect of the hot and cold fluids, and at the same time prevent the weld from cracking and causing fluid leakage.
[0065] In this invention, an inner pipe 4 is installed inside the horizontal main pipe 1 or the vertical branch pipe 2. The inner pipe 4 includes an inlet end 5 and an outlet end 6. The inlet end 5 of the inner pipe 4 is located outside the horizontal main pipe 1 or the vertical branch pipe 2, and the outlet end 6 extends into the static mixer. This ensures that there is no exchange of hot and cold fluids in the confluence section, and there is no thermal stress. This avoids fatigue failure at the welding point, which could lead to weld cracking and prevent fluid leakage. Since the outlet end 6 of the inner pipe extends into the static mixer, when the hot and cold fluids flow to the outlet end 6 of the inner pipe, they are further mixed and homogenized in the static mixer, improving the mixing effect of the hot and cold fluids and preventing fluid leakage.
[0066]
Example 6
[0067] The outlet end of the inner tube extends into the static mixer. Preferably, the length of the inner tube extending into the static mixer is 3 to 5 times the diameter of the inner tube. This ensures that the flow rate of the fluid in the inner tube is stable and the fluid distribution is uniform. It also allows the mixing position of the hot and cold fluids to avoid the weld seam, thus preventing the temperature difference change during the instantaneous mixing of the hot and cold fluids from causing the weld seam to crack and leading to fluid leakage.
[0068] The distance between the outlet end of the inner pipe and the mixing component inside the static mixer is not less than the inner diameter of the mixer pipe. Since the hot and cold fluids begin to converge at the outlet end of the inner pipe, temperature transfer occurs. After a certain distance, the fluid is evenly distributed in the mixer pipe and then enters the mixing component of the mixer for uniform mixing, thereby improving the mixing effect.
[0069] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" 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. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.
[0070] In the description of this utility model, unless otherwise stated, the terms "upper", "lower", "left", "right", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing this utility model 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 this utility model.
[0071] The above technical solution is only one implementation of this utility model. For those skilled in the art, based on the principles disclosed in this utility model, it is easy to make various types of improvements or modifications, and not limited to the technical solutions described in the above specific embodiments of this utility model. Therefore, the foregoing description is only a preferred option and does not have a limiting meaning.
Claims
1. A fluid mixer characterized by, Includes a busbar and a mixing section; The manifold includes a horizontal main pipe and a vertical branch pipe that is perpendicularly connected to the horizontal main pipe, and the horizontal main pipe is connected to the mixing section; An inner tube is provided inside the horizontal main pipe or vertical branch pipe. The inner tube includes an inlet end and an outlet end. The inlet end of the inner tube is located outside the horizontal main pipe or vertical branch pipe, and the outlet end extends into the mixing section.
2. The fluid mixer of claim 1, wherein, When the horizontal main pipe is provided with the inner pipe, both the inlet end and the outlet end of the inner pipe extend out of the horizontal main pipe.
3. The fluid mixer of claim 2, wherein, A filling layer is provided in the annular space formed by the inner tube and the horizontal main tube; The filling layer is provided on the side near the inlet end of the inner tube.
4. The fluid mixer of claim 1, wherein, When the vertical branch pipe is provided with the inner pipe, the inner pipe includes a vertical inner pipe provided in the vertical branch pipe and a horizontal inner pipe provided in the horizontal main pipe, and the vertical inner pipe and the horizontal inner pipe are connected by a bend.
5. The fluid mixer of claim 4, wherein, The end of the vertical inner tube furthest from the horizontal inner tube is the inlet end, which extends out of the vertical branch tube.
6. The fluid mixer of claim 5, wherein, The end of the horizontal inner tube furthest from the vertical inner tube is the outlet end, which extends into the mixing section.
7. The fluid mixer of claim 5 or 6, wherein, A filling layer is provided in the annular space formed by the vertical inner tube and the vertical branch tube.
8. The fluid mixer of claim 1, wherein, The mixing section is a static mixer.
9. The fluid mixer of claim 8, wherein, The length of the inner tube extending into the static mixer is 3 to 5 times the diameter of the inner tube.
10. The fluid mixer of claim 8 or 9, wherein, The distance between the outlet end of the inner pipe and the mixing component inside the static mixer is not less than the inner diameter of the mixer pipe.