Exhaust treatment device for reverse return pipe of shield pump

Abstract

An exhaust treatment device for a reverse return pipe of a shield pump comprises a spherical tank with a filling opening formed in the bottom; the shield pump is connected to the filling opening of the spherical tank, and a reverse backflow opening is formed in the shield pump; one end of the reverse backflow pipe is connected to a reverse backflow opening of the shield pump; the liquid separation tank is arranged on one side of the spherical tank, and the other end of the reverse return pipe is connected to a liquid inlet of the liquid separation tank; one end of the communicating pipe is connected to the gas phase interface of the liquid separation tank, and the other end is connected to the gas phase space of the spherical tank; an inlet of the bottom pump is connected to a liquid outlet in the bottom of the liquid separation tank; according to the utility model, the structure is novel, the gas and liquid phase return resistance of the reverse return pipe is reduced, the smoothness of the reverse return pipe is ensured, the situation that the reverse pipeline and the gas phase pipeline of the spherical tank are all filled with liquid phase materials is avoided, the production efficiency is improved, and the production cost is reduced. And the reverse return pipe of the shield pump can exhaust gas thoroughly and smoothly.

Description

Technical Field

[0001] This utility model relates to an exhaust treatment device, specifically an exhaust treatment device for a shielded pump with a reverse return pipe. Background Technology

[0002] In the petrochemical industry, canned motor pumps are widely used as a type of seal-free pump. The pump and drive motor are sealed within a pressure vessel filled with the pumping medium. This pressure vessel has only a static seal, and the rotor is driven by a rotating magnetic field provided by electrical windings. This structure eliminates the rotating shaft seal of traditional centrifugal pumps, achieving complete leak-free operation, and relying on the medium for heat dissipation and lubrication.

[0003] Currently, the mainstream types of canned motor pumps include basic type, reverse reflux type, and others. When the saturated vapor pressure of the medium is high, a basic type canned motor pump is usually chosen to transport the medium; while when the medium is easily vaporized, a reverse reflux type canned motor pump is more suitable. A reverse reflux type canned motor pump has a reverse reflux pipe at its tail end, which needs to be connected to the vapor phase zone of the suction tank. The purpose is to ensure that the vapor phase generated by heat dissipation within the canned motor pump can be fully discharged to the suction tank, reducing the accumulation of vapor phase within the pump, thereby ensuring good lubrication and cooling of the pump's bearings, shielding sleeves, and other components. Generally, the head of the reverse reflux pipe at the tail end of the canned motor pump is approximately 20% of the pump's head.

[0004] However, when the canned pump is used in 4000m 3 In the above-mentioned spherical tank area, the pump's reverse return line needs to be connected to the gas phase zone at the top of the tank. In this situation, when the canned motor pump is operating, the gaseous and liquid materials in the reverse return line need to overcome a certain height difference to return to the gas phase zone of the tank. When a canned motor pump with a smaller head is selected, and the transported material is easily liquefied, most of the gaseous phase generated by the pump will convert into liquid, preventing it from smoothly returning to the gas phase zone at the top of the tank. Over time, the gaseous phase will accumulate inside the canned motor pump, eventually preventing the pump's bearings from receiving sufficient lubrication and cooling, leading to malfunction. This results in a short service life for the canned motor pump under these conditions, making long-term stable operation impossible. Utility Model Content

[0005] In view of the above situation and to overcome the defects of the prior art, this utility model provides a shielded pump reverse return pipe exhaust treatment device, which effectively solves the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: This utility model includes:

[0007] spherical tank with a filling port at the bottom;

[0008] A shielded pump is connected to the filling port of the spherical tank, and the shielded pump is equipped with a reverse reflux port;

[0009] The reverse return pipe is connected at one end to the reverse return port of the shielded pump;

[0010] The separator is located on one side of the spherical tank, and the other end of the reverse return pipe is connected to the inlet of the separator.

[0011] The connecting pipe is connected at one end to the gas phase interface of the separator and at the other end to the gas phase space of the spherical tank.

[0012] A bottom pump, the inlet of which is connected to the drain port at the bottom of the separator;

[0013] The return pipe is connected at one end to the outlet of the bottom pump and at the other end to the inlet pipeline of the canned motor pump.

[0014] Preferably, the installation height of the separator is lower than that of the spherical tank.

[0015] Preferably, the connection point between the connecting pipe and the spherical tank is located at the top of the gas phase of the spherical tank.

[0016] Preferably, the bottom pump is a canned pump or a centrifugal pump.

[0017] Preferably, the reflux pipe is connected to the inlet pipeline of the shielded pump at the front end of the inlet valve of the shielded pump.

[0018] Preferably, the separator is equipped with a level gauge to control the start and stop of the bottom pump.

[0019] Beneficial effects: Reduces the resistance of the reverse return pipe to return gas and liquid phases, ensures the smooth flow of the reverse return pipe, and prevents the reverse pipe and the gas phase pipe of the spherical tank from being filled with liquid phase materials, so as to make the exhaust of the reverse return pipe of the shielded pump thorough and smooth.

[0020] Ensuring the operation and lifespan of the canned motor pump: Timely discharge of gas from the canned motor pump allows for adequate cooling and lubrication of the shielding sleeve, sliding bearings, and other structures, extending the pump's service life and achieving long-term stable operation.

[0021] Optimize the operation of the loading and unloading system: reduce the proportion of liquid material in the gas phase pipeline of the spherical tank, and at the same time reduce the proportion of liquid material in the gas phase pipeline of the loading and unloading system connected to the gas phase of the spherical tank, making the loading and unloading system safer to operate and improving loading and unloading efficiency, such as reducing the loading time of a single tank truck from 1.5 hours to 1.1-1.2 hours.

[0022] Similar to connecting the reverse return pipe to the flare system, which has the effect of lower pressure in the flare system, this device enables the canned pump to operate more smoothly, with lower pump tail temperature and better operating conditions. Attached Figure Description

[0023] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings:

[0024] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0025] The following are the labels in the diagram: 1. Spherical tank; 2. Separating tank; 3. Connecting pipe; 4. Shielded pump; 5. Reverse reflux pipe; 6. Bottom pump; 7. Reflux pipe. Detailed Implementation

[0026] The following is in conjunction with the appendix Figure 1 The specific embodiments of this utility model will be described in further detail.

[0027] Example 1, by Figure 1 This utility model provides a canned pump reverse return pipe exhaust treatment device, including a spherical tank 1, a separating tank 2, a connecting pipe 3, a canned pump 4, a reverse return pipe 5, a bottom pump 6, and a return pipe 7.

[0028] Spherical tank 1, with a filling port at the bottom;

[0029] A shielded pump 4 is connected to the filling port of the spherical tank 1, and the shielded pump 4 is provided with a reverse reflux port;

[0030] The reverse return pipe 5 is connected at one end to the reverse return port of the shielded pump 4;

[0031] Separating tank 2 is located on one side of spherical tank 1, and the other end of the reverse return pipe 5 is connected to the inlet of separating tank 2.

[0032] Connecting pipe 3 is connected at one end to the gas phase interface of the separator 2 and at the other end to the gas phase space of the spherical tank 1.

[0033] Bottom pump 6, whose inlet is connected to the drain port at the bottom of the separator 2;

[0034] The return pipe 7 is connected at one end to the outlet of the bottom pump 6 and at the other end to the inlet pipe of the canned pump 4.

[0035] Spherical tank 1: It is equipped with a filling port at the bottom for filling materials.

[0036] Shielded pump 4: Connected to the filling port of spherical tank 1, it is the core equipment for conveying materials and is equipped with a reverse return port.

[0037] Reverse reflux pipe 5: One end is connected to the reverse reflux port of the shielded pump 4, and the other end is connected to the liquid inlet of the separator 2. It is used to transport the gas-liquid phase material generated by the shielded pump 4 during operation to the separator 2.

[0038] Separator 2: Located on one side of spherical tank 1, its installation height is lower than that of spherical tank 1. It is used to separate gas and liquid phase materials from the reverse reflux pipe. The separated gas is discharged through the gas phase interface, while the liquid is stored inside the tank.

[0039] Connecting pipe 3: One end is connected to the gas phase interface of the separator 2, and the other end is connected to the top of the gas phase of the spherical tank 1, so as to realize the gas connection between the separator and the spherical tank and ensure pressure balance.

[0040] Bottom pump 6: The inlet is connected to the drain port at the bottom of the separator 2, and can be a canned motor pump or a centrifugal pump. It is used to transport the liquid stored in the separator to the return pipe.

[0041] Return pipe 7: One end is connected to the outlet of the bottom pump 6, and the other end is connected to the inlet line at the front end of the inlet valve of the canned motor pump 4. It is used to return the liquid delivered by the bottom pump to the inlet line of the canned motor pump.

[0042] Level gauge: installed in the separator 2, used to monitor the liquid level in the separator and control the start and stop of the bottom pump 6.

[0043] Working principle: When this utility model is used, the gas-liquid mixture is transported: when the shielded pump 4 is running, the internal medium forms a gas-liquid mixture due to heat dissipation, vaporization, etc.

[0044] The mixed phase is discharged from the reverse reflux port of the shielded pump 4 and transported to the inlet of the separator 2 through the reverse reflux pipe 5.

[0045] Gas-liquid separation is achieved by installing the separator 2 at a lower height than the spherical tank 1. After the gas-liquid mixture enters the separator 2, it is naturally separated under the action of gravity.

[0046] The separated gas phase enters the connecting pipe 3 through the gas phase interface at the top of the liquid separator 2, and is then transported to the top space of the gas phase of the spherical tank 1, so as to realize the gas phase connection between the liquid separator 2 and the spherical tank 1 and maintain the system pressure balance.

[0047] The separated liquid is accumulated and stored in separatory tank 2.

[0048] Automated liquid phase recovery: The liquid level is monitored in real time by the level gauge in the separator 2.

[0049] When the liquid level rises to the high level, the level gauge sends a signal, and the bottom pump 6 starts automatically, transporting the liquid phase at the bottom of the separator 2 to the inlet pipeline at the front end of the inlet valve of the shielded pump 4 through the return pipe 7.

[0050] When the liquid level drops to the low level, the level gauge sends a signal, and the bottom pump 6 stops automatically.

[0051] Lowering the installation height of the separator 2 shortens the "gas-liquid return path" of the reverse return pipe 5, reducing the height difference resistance that needs to be overcome when the gas-liquid mixed phase is returned.

[0052] This ensures smooth gas discharge, prevents accumulation inside the canned pump 4, and ensures that the bearings, shielding sleeves, and other components of the canned pump 4 are adequately lubricated and cooled, thus extending the service life of the canned pump 4.

[0053] Beneficial effects: Reduces the resistance of the reverse return pipe 5 to return gas and liquid phase, ensures the smooth flow of the reverse return pipe 5 line, prevents the reverse pipeline and the gas phase pipeline of the spherical tank 1 from being filled with liquid phase material, and makes the exhaust of the reverse return pipe 5 of the shielded pump 4 thorough and smooth.

[0054] To ensure the operation and lifespan of the canned motor pump 4: timely discharge of gas from the canned motor pump 4, allowing the shielding sleeve, sliding bearings and other structures to be fully cooled and lubricated, thereby extending the service life of the canned motor pump 4 and achieving long-term stable operation.

[0055] Optimize the operation of the loading and unloading system: reduce the proportion of liquid material in the gas phase pipeline of spherical tank 1, and at the same time reduce the proportion of liquid material in the gas phase pipeline of the loading and unloading system connected to the gas phase of spherical tank 1, so as to make the loading and unloading system safer and improve loading and unloading efficiency, such as reducing the loading time of a single tank truck from 1.5 hours to 1.1-1.2 hours.

[0056] Similar to connecting the reverse return pipe 5 to the flare system, which has the effect of low pressure in the flare system, this device can make the canned pump 4 run more smoothly, with lower pump tail temperature and better operating conditions.

[0057] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A canned pump reverse return pipe exhaust treatment device, characterized in that, include: A spherical tank (1) with a filling port at the bottom; A shielded pump (4) is connected to the filling port of the spherical tank (1), and the shielded pump (4) is provided with a reverse return port; The reverse return pipe (5) is connected at one end to the reverse return port of the shielded pump (4); The separator (2) is located on one side of the spherical tank (1), and the other end of the reverse return pipe (5) is connected to the inlet of the separator (2); The connecting pipe (3) is connected at one end to the gas phase interface of the separator (2) and at the other end to the gas phase space of the spherical tank (1); Bottom pump (6), whose inlet is connected to the drain port at the bottom of the separator (2); The return pipe (7) is connected at one end to the outlet of the bottom pump (6) and at the other end to the inlet line of the shielded pump (4).

2. The exhaust treatment device for a shielded pump reverse return pipe according to claim 1, characterized in that: The installation height of the liquid separator (2) is lower than that of the spherical tank (1).

3. The exhaust treatment device for a shielded pump reverse return pipe according to claim 2, characterized in that: The connection point between the connecting pipe (3) and the spherical tank (1) is located at the top of the gas phase of the spherical tank (1).

4. The exhaust treatment device for a shielded pump reverse return pipe according to claim 3, characterized in that: The bottom pump (6) is a shielded pump or a centrifugal pump.

5. The exhaust treatment device for a shielded pump reverse return pipe according to claim 4, characterized in that: The return pipe (7) is connected to the inlet pipeline of the shielded pump (4) at the front end of the inlet valve of the shielded pump (4).

6. The exhaust treatment device for a shielded pump reverse return pipe according to claim 5, characterized in that: The liquid separator (2) is equipped with a level gauge to control the start and stop of the bottom pump (6).

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