CN213995690U

CN213995690U - Three-section type mixing device

Info

Publication number: CN213995690U
Application number: CN202022065897.XU
Authority: CN
Inventors: 胡纪全; 劳瑞卿; 李志富
Original assignee: China Petroleum and Chemical Corp
Current assignee: China Petroleum and Chemical Corp
Priority date: 2020-09-18
Filing date: 2020-09-18
Publication date: 2021-08-20
Anticipated expiration: 2030-09-18

Abstract

The utility model discloses a three-section mixing device, which is characterized by comprising a Venturi tube part, a premixing part and a blending part which are connected in sequence, wherein the Venturi tube part comprises a Venturi tube, and the necking part of the Venturi tube is connected with at least one additive branch tube; the premixing part comprises a mixer body and a liquid inlet pipe arranged on the mixer body, the mixer body comprises a conical cylinder and a cylinder connected to the large end of the conical cylinder, and the liquid inlet pipe is arranged on the cylinder along the tangential direction; a static mixer group is connected in series to the mixing branch pipe of the mixing section. In this application, set up three structure that is used for strengthening mixing the effect altogether, be venturi, feed liquor pipe tangent line installation and static mixer group on the drum respectively, guaranteed the mixing homogeneity of oil.

Description

Three-section type mixing device

Technical Field

The utility model relates to a syllogic mixing arrangement for the online blending of oil of petrochemical enterprise.

Background

The on-line blending mode of oil products commonly used at home and abroad is pipeline blending, and the blending process is that according to the requirements of the variety of the blended oil products, all component oils are fed into a blending main pipe according to a certain formula proportion, and at the same time, an additive with a set proportion is fed into the blending main pipe through an on-line additive system, and finally the additive is uniformly mixed with the component oils in a static mixer and then fed into a finished product oil storage tank.

The static mixer is an important device in an oil product pipeline blending process, but long-term practice shows that the change of the turbulence intensity of fluid in the static mixer can be caused due to the influence of process change or external factors, so that the full mixing between component oil and between the component oil and an additive can not be completely ensured under partial states, the quality of the blended product oil is not uniformly distributed, and density layering is easy to generate.

The on-line blending system can blend different types of product oils according to the formula proportion, the component oils required by the different types of product oils are different, the flow rate of the component oils is changed in the blending process, the flow rate of a blending main pipe is changed, but the rated flow rate of a mixer is not changed, so that the problem that the flow rate of the blending main pipe is not matched with the rated flow rate of the mixer easily occurs, the blended product oils are not fully mixed, the density is layered, and in addition, the mixing effect of a single mixer is poor. The density stratification or insufficient mixing of the finished oil generally carries out the circulation operation of the oil in the tank through the pump, which not only causes the accessory loss of manpower and material resources, such as the electrical loss of the circulating pump, the loss generated by the oil circulation, the oil gas emission and other problems, but also prolongs the factory period of the finished oil.

SUMMERY OF THE UTILITY MODEL

In order to solve the problems, the utility model provides a three-section mixing device, a serial communication port, including the venturi portion that connects in proper order, mix portion and blending portion in advance, wherein venturi portion includes venturi and the total pipe and the total exit tube of advancing that set up at venturi's relative both ends, be connected with an at least additive branch pipe on this venturi's throat, this additive branch pipe is used for being connected to the additive jar, along additive jar to venturi's direction, it has filters, additive pump, additive governing valve to establish ties on the additive branch pipe, and install pressure gauge and flowmeter on the additive branch pipe;

the premixing part comprises a mixer body and a liquid inlet pipe arranged on the mixer body, the mixer body comprises a conical cylinder and a cylinder connected to the large end of the conical cylinder, the liquid inlet pipe is installed on the cylinder along the tangential direction, and a total outlet pipe is connected to the liquid inlet pipe;

the blending part comprises at least three mixing branch pipes which are arranged side by side, a static mixer group is connected in series on each mixing branch pipe, the two ends of each mixing branch pipe are respectively formed into a liquid inlet end and a liquid outlet end, the liquid inlet ends of all the mixing branch pipes are connected to the small end of the conical cylinder, and the liquid outlet ends of all the mixing branch pipes are connected to the discharge main pipe.

In this application, set up three structure that is used for strengthening mixed effect altogether, be venturi respectively, the tangent line installation and the static mixer group of feed liquor pipe on the drum, venturi department, various additives can directly enter into venturi's throat portion through the additive branch pipe in, the component oil is gone into by always advancing the pipe and is got into, form mixed liquid with the additive, mixed liquid when flowing venturi, because the expansion of pipe diameter, the velocity of flow of mixed liquid reduces the inside static pressure increase of mixed liquid, each component can the fast dispersion in the component oil in the messenger mixes liquid. When the mixed liquid enters the mixer body along the tangential direction, the mixed liquid can rotate in the mixer body, and the uniform mixing of all components in the mixed liquid is facilitated. When the mixed liquid passes through the static mixer group, the dispersion uniformity of each component is further improved.

The auxiliary agent adding system of the Venturi tube mainly comprises a blending main pipe, the Venturi tube, a pressure transmitter, a flowmeter, an agent tank, a filter, an agent adding pump, a one-way valve and the like. The venturi tube is additionally arranged in the blending main pipe, the outlet of the additive pump is connected with the throat pipe of the venturi tube, the pressure of the outlet of the additive pump can be reduced, the problems that the additive pump flange or the seal is leaked and damaged due to the pressure building and the like can be solved, the turbulence intensity can be enhanced by the venturi tube, the component oil and the component oil as well as the component oil and the additive are fully mixed, the effect of primary premixing is achieved, and the stable operation of an additive system is guaranteed.

Furthermore, the liquid inlet ends of all the mixing branch pipes are connected to a distribution pipe, a liquid inlet pipe is installed on the distribution pipe, the liquid inlet pipe is connected to the small end of the conical cylinder through a necking pipe, and the inner diameter of the necking pipe is smaller than that of the liquid inlet pipe. After the necking pipe is arranged, the necking pipe can have a Venturi effect, the mixed liquid can be mixed again after being sprayed out from the necking pipe, and the dispersion uniformity of each component in the mixed liquid is improved.

Furthermore, in order to improve the uniformity of the mixed liquid, at least two liquid inlet pipes are arranged, the inner diameters of the main inlet pipe and the main outlet pipe are the same, and the sectional area of the main inlet pipe is 2-3 times of the sum of the sectional areas of all the liquid inlet pipes. Because the total sectional area of the liquid inlet pipe is reduced, the mixed liquid forms turbulent flow when passing through the liquid inlet pipe, and the dispersion uniformity of each component in the mixed liquid is further improved.

Further, in order to ensure the mixing effect, each static mixer group comprises at least three static mixers which are connected in series and have different flow rates. Specifically, the rated flow of the static mixer is 200-300 m³/h。

Furthermore, each mixing branch pipe is provided with a branch pipe regulating valve, and the discharge main pipe is provided with a main pipe regulating valve.

The regulating valve of the branch pipe can ensure that the flow in each liquid inlet pipe only can reach the rated flow of the static mixer, and each component of the mixed liquid can reach good mixing effect in the static mixer. The back pressure of the main pipe adjusting valve can be adjusted to improve the pressure in the main pipe, increase the resistance of the pipeline and strengthen the mixing effect.

Drawings

Fig. 1 is a schematic structural diagram of an embodiment of the present invention.

Detailed Description

Referring to fig. 1, a three-stage mixing device includes a venturi tube part 100, a premixing part 300, and a blending part 500, which are connected in sequence, wherein the venturi tube part 100 includes a venturi tube 22, and a main inlet pipe 21 and a main outlet pipe 24 disposed at opposite ends of the venturi tube, and the main inlet pipe 21 and the main outlet pipe 24 are cut from the same steel pipe, and have the same inner diameter. Two additive branch pipes 10 are connected to a necking portion 23 of the venturi tube 22, the additive branch pipes 10 are connected to an additive tank 101, a first cut-off valve 11, a filter 12, an additive pump 13, a check valve 14 and an additive adjusting valve 15 are connected in series to the additive branch pipes 10 in the direction from the additive tank 101 to the venturi tube 22, and the additive adjusting valve 15 is an electric valve. A first pressure gauge 16 and a first flow meter 17 are also mounted on the additive branch pipe. A second pressure gauge 25 and a second flow meter 26 are mounted on the outgoing pipe 24. In this embodiment, two additive branch pipes are provided, and it is understood that in other embodiments, only one or more additive branch pipes, for example, three or five additive branch pipes, may be provided, and the specific configuration may be set according to the type of additive.

The premixing part 300 includes a mixer body 30 and three liquid inlet pipes 33 provided on the mixer body 30, the mixer body 30 includes a conical cylinder 31 and a cylinder 32 connected to a large end of the conical cylinder 31, and the liquid inlet pipes 33 are installed on the cylinder in a tangential direction.

The ends of all the inlet pipes 33 remote from the mixer body 30 are connected to an annular pipe 34, and the total outlet pipe 24 connects the annular pipe 34 to all the inlet pipes 33. In this embodiment, the sectional area of the total inlet pipe is 2.5 times of the sum of the sectional areas of all the inlet pipes.

The mixing section 500 includes at least three mixing branch pipes 51 arranged side by side, a static mixer group 55 is connected in series to each mixing branch pipe, a first stop valve 54 and a second stop valve 56 are respectively attached to both sides of the static mixer group 55, and a branch pipe regulating valve 57, a third pressure gauge 52 and a third flow meter 53 are attached to the mixing branch pipes 51. In this embodiment, the manifold regulating valve 57 is a pneumatic shutoff valve.

In this embodiment, each static mixer group includes three static mixers connected in series at different flow rates. The rated flow of the static mixer is 200-300 m 3/h.

The two ends of each mixing branch pipe are respectively formed into a liquid inlet end and a liquid outlet end, all the liquid inlet ends are connected to an annular distribution pipe 41, a liquid inlet pipe 36 is installed on the distribution pipe, the liquid inlet pipe 36 is connected to the small end of the conical barrel 31 through a necking pipe 35, and the inner diameter of the necking pipe 35 is smaller than that of the liquid inlet pipe 36.

All outlet ends are connected to a collecting pipe 42 in the form of a ring, which collecting pipe 42 is connected to an outlet collecting pipe 43. A manifold regulating valve 44 is installed on the discharge manifold, and a fourth pressure gauge 45 and a fourth flow meter 46 are installed on the discharge manifold. The manifold regulator valve 44 is a pneumatic shut-off valve.

Claims

1. A three-section mixing device is characterized by comprising a Venturi tube part, a premixing part and a blending part which are connected in sequence, wherein the Venturi tube part comprises a Venturi tube, a main inlet pipe and a main outlet pipe which are arranged at two opposite ends of the Venturi tube, the necking part of the Venturi tube is connected with at least one additive branch pipe, the additive branch pipe is used for being connected to an additive tank, a filter, an additive pump and an additive regulating valve are connected in series on the additive branch pipe along the direction from the additive tank to the Venturi tube, and a pressure gauge and a flow meter are arranged on the additive branch pipe;

2. The three-stage mixing device according to claim 1,

the liquid inlet ends of all the mixing branch pipes are connected to a distribution pipe, a liquid inlet pipe is installed on the distribution pipe, the liquid inlet pipe is connected to the small end of the conical barrel through a necking pipe, and the inner diameter of the necking pipe is smaller than that of the liquid inlet pipe.

3. The three-stage mixing apparatus according to claim 1, wherein at least two liquid inlet pipes are provided, the total inlet pipe and the total outlet pipe have the same inner diameter, and the sectional area of the total inlet pipe is 2 to 3 times the sum of the sectional areas of all the liquid inlet pipes.

4. The three-stage mixing device according to claim 1, wherein each static mixer group comprises at least three static mixers of different flow rates connected in series.

5. The three-stage mixing device according to claim 4, wherein the static mixer has a rated flow of 200-300 m³/h。

6. The three-stage mixing apparatus according to claim 1, wherein a branch regulating valve is installed on each mixing branch pipe, and a main pipe regulating valve is installed on the discharge main pipe.