CN215672666U - Mechanical seal system of natural gas acetylene preparation device NMP solvent pump - Google Patents
Mechanical seal system of natural gas acetylene preparation device NMP solvent pump Download PDFInfo
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- CN215672666U CN215672666U CN202121420398.6U CN202121420398U CN215672666U CN 215672666 U CN215672666 U CN 215672666U CN 202121420398 U CN202121420398 U CN 202121420398U CN 215672666 U CN215672666 U CN 215672666U
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Abstract
The utility model discloses a mechanical seal system of an NMP solvent pump of a natural gas acetylene preparation device, which comprises a mechanical seal liquid tank, a mechanical seal liquid delivery pump and a plurality of NMP solvent pumps, wherein the mechanical seal form of the NMP solvent pump is set as a double-end out-of-plane flushing mechanical seal, NMP solvent in the mechanical seal liquid tank is boosted by the mechanical seal liquid delivery pump and then is conveyed to a mechanical seal inlet of the NMP solvent pump through a pipe to be used as mechanical seal medium, and the NMP solvent at a mechanical seal outlet of the NMP solvent pump is collected and then returned to the mechanical seal liquid tank. The utility model can completely solve the problems of easy leakage and easy blockage of the conventional natural gas acetylene device NMP solvent pump mechanical seal system, improves the safety and the continuity of the operation of the related mechanical pump, and does not influence the solvent balance of the NMP system.
Description
Technical Field
The utility model relates to the technical field of chemical industry, in particular to a mechanical seal system of an NMP solvent pump of a device for preparing acetylene from natural gas.
Background
Acetylene is used as an important chemical raw material and is generally prepared by a calcium carbide method and a natural gas partial oxidation method. Compared with the acetylene preparation process by the calcium carbide method, the process for preparing acetylene from natural gas has the advantages of low energy consumption, full utilization of byproducts, small environmental pollution and the like, and is widely applied at home and abroad at present. The process for preparing acetylene from natural gas comprises the working procedures of natural gas cracking, gas compression, acetylene concentration, solvent treatment and the like. After partial oxidation reaction of raw material natural gas and oxygen, cracking at high temperature to generate cracking gas containing acetylene, hydrogen, carbon monoxide, carbon dioxide, methylacetylene, diacetylene and other components; boosting the pressure of the cracked gas, sending the cracked gas to an acetylene concentration process, selectively absorbing and resolving different component gases in the cracked gas in a segmented mode through an NMP (N-methyl pyrrolidone) solvent to obtain acetylene, acetylene tail gas and high-grade acetylene gas, wherein the NMP solvent is recycled in the device; the polymer generated in the solvent is removed in the solvent treatment process.
A large number of pumps are used for circulating and conveying NMP solvent in the acetylene concentration process. The part of the mechanical pumps generally adopts a packing sealing or medium self-flushing sealing mechanical seal mode so as to avoid other media entering an NMP system through the mechanical seal to influence the solvent balance of a concentration system. Because the NMP solvent is rich in solid polymers and dissolves a large amount of flammable and toxic gases such as acetylene, hydrogen, carbon monoxide and the like, the two mechanical seal forms have the problems of high safety risk, easy blockage of mechanical seals and the like, and flushing liquid (comprising water, glycol, white oil and the like) of the traditional double-end mechanical seal enters a system and both influences the NMP solvent balance and the absorption effect.
SUMMERY OF THE UTILITY MODEL
In order to solve the problems, the utility model provides a mechanical seal system of a natural gas acetylene preparation device NMP solvent pump, which can completely solve the problems of easy leakage and easy blockage of the mechanical seal system of the conventional natural gas acetylene preparation device NMP solvent pump, improve the safety and continuity of the operation of the related mechanical pump and do not influence the solvent balance of the NMP system.
The mechanical seal system of the NMP solvent pump of the natural gas acetylene preparation device comprises a mechanical seal liquid tank, a mechanical seal liquid delivery pump and a plurality of NMP solvent pumps, wherein the mechanical seal form of the NMP solvent pump is set as a double-end out-of-plane flushing mechanical seal, NMP solvent in the mechanical seal liquid tank is boosted by the mechanical seal liquid delivery pump and then is delivered to a mechanical seal inlet of the NMP solvent pump through a pipe to serve as mechanical seal medium, and the NMP solvent at a mechanical seal outlet of the NMP solvent pump is collected and then returned to the mechanical seal liquid tank, so that a set of closed mechanical seal system is formed.
Furthermore, a set of adjusting hand valve, a rotor flow meter and a pressure gauge are arranged on the mechanical seal inlet and outlet pipeline of the NMP solvent pump and used for adjusting and controlling the flow and pressure required by the mechanical seal system.
Furthermore, the NMP solvent is a clean NMP solvent after the polymer is removed through vacuum degassing of solvent treatment equipment, so that the problem that the polymer blocks a machine seal can be effectively avoided, and the influence on the NMP solvent balance in the concentration process cannot be caused.
Furthermore, a purge pipeline is arranged at an outlet of the machine seal liquid delivery pump and is used for periodically delivering part of the NMP solvent in closed circulation to the solvent treatment equipment, so that the NMP solvent containing polymers and harmful gases under accident conditions can be prevented from leaking into the machine seal system and accumulating in the machine seal system.
Furthermore, a flow regulating valve is arranged at an outlet of the mechanical seal liquid delivery pump and used for regulating the purge flow.
Further, a fresh solvent pipeline is arranged between the machine seal liquid delivery pump and the solvent treatment equipment and is used for receiving the NMP solvent treated by the solvent treatment equipment; and a liquid supplementing pipeline is led out from the fresh solvent pipeline to a newly-added machine seal liquid tank and is used for initial filling of the NMP solvent and liquid level adjustment of the machine seal liquid tank.
The utility model has the beneficial effects that:
the mechanical seal system can completely solve the problems of easy leakage and easy blockage of the mechanical seal system of the NMP solvent pump of the conventional natural gas acetylene device, improves the safety and the continuity of the operation of the related mechanical pump, and does not influence the solvent balance of the NMP system;
a set of regulating hand valve, a rotor flow meter and a pressure gauge are arranged on a mechanical seal inlet and outlet pipeline of the NMP solvent pump, so that the flow and the pressure required by a mechanical seal system can be accurately regulated and controlled in real time;
the outlet of the machine seal liquid delivery pump is provided with a relief pipeline, so that part of the NMP solvent in closed circulation can be periodically delivered to solvent treatment equipment, and the NMP solvent containing polymer and harmful gas under the accident condition is prevented from leaking into the machine seal system and accumulating in the machine seal system;
the NMP solvent is cleaned after vacuum degassing and polymer removal through solvent treatment equipment, so that the problem of polymer blockage of machine sealing can be effectively avoided, and the influence on the NMP solvent balance in the concentration process cannot be caused.
Drawings
Fig. 1 is a schematic diagram of a mechanical seal system according to an embodiment of the present invention.
Reference numerals: 1-machine sealing liquid tank, 2-machine sealing liquid delivery pump, 3-NMP solvent pump, 4-adjusting hand valve, 5-flow adjusting valve, 6-pipeline filter and 7-conical filter; a-solvent treatment equipment, B-fresh solvent storage tank, FI-rotor flow meter, PI-pressure meter, FC-flow meter, LC-liquid level meter, L1-relief pipeline, L2-fresh solvent pipeline and L3-liquid supplementing pipeline.
Detailed Description
In order to more clearly understand the technical features, objects, and effects of the present invention, specific embodiments of the present invention will now be described. It should be understood that the detailed description and specific examples, while indicating the preferred embodiment of the utility model, are intended for purposes of illustration only and are not intended to limit the scope of the utility model. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.
The utility model provides a mechanical seal system of an NMP solvent pump of a natural gas acetylene preparation device, which comprises a mechanical seal liquid tank 1, a mechanical seal liquid delivery pump 2 and a plurality of NMP solvent pumps 3, wherein the mechanical seal form of the NMP solvent pumps 3 is set as a double-end out-of-plane flushing mechanical seal, NMP solvent in the mechanical seal liquid tank 1 is boosted by the mechanical seal liquid delivery pump 2, a pipe is conveyed to a mechanical seal inlet of the NMP solvent pump 3 to be used as mechanical seal medium, and NMP solvent at a mechanical seal outlet of the NMP solvent pump 3 is gathered and then returned to the mechanical seal liquid tank 1, so that a set of closed mechanical seal system is formed.
In a preferred embodiment of the utility model, a flow regulating valve 5, a set of regulating hand valve 4, a rotor flow meter FI and a pressure gauge PI are arranged on the machine seal inlet and outlet pipeline of the NMP solvent pump 3 and used for regulating and controlling the flow and the pressure required by the machine seal system.
In another preferred embodiment of the present invention, the NMP solvent is a clean NMP solvent after vacuum degassing and polymer removal by the solvent treatment device a, which can effectively avoid the problem of polymer blockage and machine sealing, and does not affect the NMP solvent balance of the concentration process.
In a further preferred embodiment of the present invention, the outlet of the machine seal liquid delivery pump 2 is provided with a relief line L1 for periodically delivering a part of the NMP solvent in a closed circulation to the solvent treatment equipment a, so as to prevent the NMP solvent containing polymer and harmful gas from leaking into the machine seal system and accumulating therein in an accident condition.
In a further preferred embodiment of the utility model, the outlet of the mechanical seal fluid delivery pump 2 is provided with a flow regulating valve 5 for regulating the purge flow. More specifically, a fresh solvent line L2 is provided between the machine seal liquid delivery pump 2 and the solvent treatment device a for receiving the NMP solvent treated by the solvent treatment device a. A liquid supplementing pipeline L3 is led out of the fresh solvent pipeline L2 to the newly added machine seal liquid tank 1 and is used for initial filling of the NMP solvent and liquid level adjustment of the machine seal liquid tank 1.
In conclusion, the mechanical seal system can completely solve the problems that the conventional natural gas acetylene device NMP solvent pump mechanical seal system is easy to leak and block, improves the safety and continuity of the operation of the related mechanical pump, and does not influence the solvent balance of the NMP system.
The foregoing is illustrative of the preferred embodiments of this invention, and it is to be understood that the utility model is not limited to the precise form disclosed herein and that various other combinations, modifications, and environments may be resorted to, falling within the scope of the concept as disclosed herein, either as described above or as apparent to those skilled in the relevant art. And that modifications and variations may be effected by those skilled in the art without departing from the spirit and scope of the utility model as defined by the appended claims.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or orientations or positional relationships conventionally placed when the present invention is used, and are only for convenience of description and simplicity of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," and "connected" are to be construed broadly, e.g., as meaning fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; either a wired or wireless connection.
Claims (6)
1. The mechanical seal system of the NMP solvent pump of the natural gas acetylene preparation device is characterized by comprising a mechanical seal liquid tank, a mechanical seal liquid delivery pump and a plurality of NMP solvent pumps, wherein a mechanical seal form of the NMP solvent pump is set to be a double-end out-of-plane flushing mechanical seal, NMP solvent in the mechanical seal liquid tank is boosted by the mechanical seal liquid delivery pump and then is delivered to a mechanical seal inlet of the NMP solvent pump through a pipe to serve as a mechanical seal medium, and the NMP solvent at a mechanical seal outlet of the NMP solvent pump is collected and then returned to the mechanical seal liquid tank.
2. The mechanical seal system of the NMP solvent pump of the natural gas acetylene making device according to claim 1, wherein a set of adjusting hand valve, a rotor flow meter and a pressure gauge are arranged on an inlet and outlet pipeline of the mechanical seal of the NMP solvent pump and used for adjusting and controlling flow and pressure required by the mechanical seal system.
3. The mechanical seal system of a natural gas acetylene unit NMP solvent pump according to claim 1, wherein the NMP solvent is a clean NMP solvent after vacuum degassing and polymer removal by a solvent treatment device.
4. The mechanical seal system of the natural gas acetylene production device NMP solvent pump according to claim 3, wherein an outlet of the mechanical seal liquid delivery pump is provided with a relief pipeline for periodically delivering a part of the NMP solvent in a closed circulation to the solvent treatment equipment.
5. The mechanical seal system of the natural gas acetylene production device NMP solvent pump according to claim 4, wherein the outlet of the mechanical seal liquid delivery pump is provided with a flow regulating valve for regulating the purge flow.
6. The machine seal system of the natural gas acetylene production device NMP solvent pump according to claim 4 or 5, characterized in that a fresh solvent pipeline is arranged between the machine seal liquid delivery pump and the solvent treatment equipment and is used for receiving the NMP solvent treated by the solvent treatment equipment; and a liquid supplementing pipeline is led out from the fresh solvent pipeline to a newly-added machine seal liquid tank and is used for initial filling of the NMP solvent and liquid level adjustment of the machine seal liquid tank.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121420398.6U CN215672666U (en) | 2021-06-24 | 2021-06-24 | Mechanical seal system of natural gas acetylene preparation device NMP solvent pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121420398.6U CN215672666U (en) | 2021-06-24 | 2021-06-24 | Mechanical seal system of natural gas acetylene preparation device NMP solvent pump |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215672666U true CN215672666U (en) | 2022-01-28 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121420398.6U Active CN215672666U (en) | 2021-06-24 | 2021-06-24 | Mechanical seal system of natural gas acetylene preparation device NMP solvent pump |
Country Status (1)
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| CN (1) | CN215672666U (en) |
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2021
- 2021-06-24 CN CN202121420398.6U patent/CN215672666U/en active Active
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