C4 delivery pump sealing system
By placing the sealed dynamic and static ring in white oil in the carbon 4 conveying pump, and combining the design of low-pressure nitrogen pressurization and flow-limiting orifice plate, the leakage problem caused by coking the sealing surface of the carbon 4 medium pump is solved, and mechanical sealing is realized long life and safe and stable operation of the pump.
Patent Information
- Application Number
- CN202420180321.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-01-25
- Publication Date
- 2024-12-31
- Estimated Expiration
- 2034-01-25
AI Technical Summary
The mechanical seal of the carbon four-media pump is extremely short due to the coking of the sealing surface of the dynamic and static ring, which affects the operation safety and cost of the pump, and the delivery process of the ethylene device cannot be optimized.
A carbon four-transport pump sealing system is designed to ensure sufficient sealing liquid by running the first-stage sealing dynamic and static ring in white oil, and using low-pressure nitrogen pressurization and flow-limiting orifice plates to prevent medium leakage.
It effectively avoids leakage of carbon four media, extends the service life of mechanical seals, and ensures the safe operation and continuous and stable delivery of the machine pump.
Smart Images
Figure CN222277492U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of mechanical seals, in particular to a carbon four delivery pump sealing system. Background Art
[0002] Under the specified operating conditions of the delivery pump, the service life of the mechanical seal should be at least 25,000 hours.
[0003] Mechanical seals rely on the two end faces of the static ring and the dynamic ring to be pressed tightly. The two end faces achieve axial end face sealing under the action of fluid pressure and the spring pressure of the compensation mechanism to prevent fluid leakage. The components of mechanical seals can be divided into dynamic rings, static rings, elastic compensation mechanisms and auxiliary sealing rings.
[0004] In fact, the mechanical seal of the C4 medium pump has an extremely short service life due to coking of the dynamic and static ring sealing surfaces. Leakage will occur after an average operating cycle of 15-30 days, which is far shorter than the normal service life of the mechanical seal. In addition, the butadiene content in the operating medium is relatively high, which is highly toxic and easy to polymerize, seriously affecting the safety of the pump operation, as well as the occupational health of personnel and the cost of inspection and maintenance. Secondly, the mixed C4 by-product of the separation unit of the ethylene unit is transported to the mixed C4 tank area by a machine pump, and then transported back to the butadiene unit of the ethylene unit by the mixed C4 tank area by a machine pump. In theory, it is feasible for the ethylene unit to directly supply butadiene mixed C4, but the debutanizer pump frequently experiences mechanical seal failures and leaks, which makes it impossible to optimize the relevant transportation process. Utility Model Content
[0005] In order to solve the technical problems mentioned in the background technology, the utility model provides a C4 delivery pump sealing system, and the technical solution adopted is as follows:
[0006] A C4 delivery pump sealing system includes a pump body, and the pump body connects a rotating shaft to a motor through a mechanical seal. The characteristic is that the mechanism seal is connected to a sealing liquid storage tank through a pipeline. The pump body and the mechanical seal belong to the prior art and the applicant will not repeat them. The sealing liquid storage tank contains white oil. Such a design allows the primary sealing dynamic and static rings of the mechanical seal to run in the white oil, thereby preventing the C4 medium from coking on the sealing surfaces of the dynamic and static rings of the mechanical seal and causing leakage. When the primary seal leaks, the pressure of the flushing system is greater than the pressure on the back of the pump impeller, and the C4 medium will not leak out, thereby ensuring the safe operation of the machine pump.
[0007] Preferably: in order to ensure the safe operation of the machine pump, the upper part of the sealed liquid storage tank is connected to the nitrogen through a pressurized pipeline. The pressurized pipeline is provided with a pressure monitoring gauge. When the primary or secondary seal leaks, the remote monitoring low pressure alarm is sounded. The limiting orifice plate added to the low-pressure nitrogen pipeline can effectively prevent the sealing liquid in the storage tank from leaking out in a short time, causing the carbon four medium to leak out, thereby ensuring the safe operation of the machine pump.
[0008] Preferably: the sealing liquid storage tank is connected to the manual liquid replenishing pump through a pipeline. When the liquid level in the sealing liquid storage tank is low, the added manual liquid replenishing pump can add sealing flushing liquid online to avoid stopping the pump or reversing the pump to ensure continuous and stable operation of the pump.
[0009] In the present invention, a mechanical sealing technology for carbon four media is proposed, and its method is to make the first-level sealing dynamic and static rings run in white oil, and low-pressure nitrogen is used to pressurize the sealing flushing liquid of the storage tank, and a flow limiting orifice plate and a regulating valve are added to the low-pressure nitrogen pipeline. The monitoring pressure gauge of the sealing liquid storage tank is replaced, and 0-0.4Mpa is replaced with 0-1.0Mpa, and the remote pressure alarm of the sealing liquid storage tank is revised from an alarm above 0.1Mpa to a low pressure alarm below 0.55Mpa, and a manual liquid replenishing pump is added to add the sealing flushing liquid online.
[0010] The utility model has the following advantages: through the structural transformation of the utility model, the technical problem of poor sealing effect of existing mechanical seals in carbon four media can be solved, and it is mainly used in the transportation of carbon four media. BRIEF DESCRIPTION OF THE DRAWINGS
[0011] Figure 1 It is the working principle diagram of the utility model;
[0012] In the figure: 1: pump body; 2: mechanical seal; 3: sealing liquid storage tank; 4: motor; 5: pressurized pipeline; 6: manual liquid replenishing pump; 7: pressure monitoring gauge. DETAILED DESCRIPTION
[0013] Example 1
[0014] like Figure 1 As shown:
[0015] A sealing system for a C4 delivery pump comprises a pump body 1, the pump body 1 connects a rotating shaft with a motor 4 through a mechanical seal 2, the mechanical seal 2 is connected with a sealed liquid storage tank 3 through a pipeline, and the sealed liquid storage tank 3 contains white oil;
[0016] The sealed liquid storage tank 3 is connected to a manual liquid replenishing pump 6 through a pipeline, and the manual liquid replenishing pump 6 is used for replenishing white oil.
[0017] The upper part of the sealed liquid storage tank 3 is connected to nitrogen through a pressurized pipeline 5, and the pressurized pipeline is used for pressurization. The pressurized pipeline 5 is provided with a pressure monitoring meter 7, and the pressure monitoring meter 7 is used for monitoring pressure.
[0018] The following is a specific application of the utility model:
[0019] By renovating the debutanizer reflux pump P-1440A / B of the ethylene unit, the original average service life of the P-1440A mechanical seal was 26 days before the renovation, and the original average service life of the P-1440B mechanical seal was 19 days. After the renovation, the mechanical seal was observed and operated continuously for 3 months. The mechanical seal was intact without leakage, the average monthly decline rate of the sealing tank liquid level was less than 5%, the sealing liquid storage tank pressure was >0.55Mpa, and no alarm occurred in the remote pressure monitoring.
[0020] In summary, the above-mentioned transformation has a better effect in actual application and is suitable for comprehensive promotion and application.
[0021] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the present invention.
Claims
1. A sealing system for a C4 delivery pump, comprising a pump body (1), wherein the pump body (1) connects a rotating shaft to a motor (4) via a mechanical seal (2), characterized in that: The mechanical seal (2) is connected to the sealed liquid storage tank (3) through a pipeline, and the sealed liquid storage tank (3) contains white oil.
2. A C4 delivery pump sealing system as claimed in claim 1, characterized in that: The sealed liquid storage tank (3) is connected to the manual liquid replenishing pump (6) via a pipeline.
3. A C4 delivery pump sealing system as claimed in claim 1, characterized in that: The upper part of the sealed liquid storage tank (3) is connected to nitrogen through a pressurized pipeline (5).
4. A C4 delivery pump sealing system as claimed in claim 3, characterized in that: The pressurized pipeline (5) is provided with a pressure monitoring meter (7).