CN110953195A - Method and system for flushing mechanical seal of pump - Google Patents
Method and system for flushing mechanical seal of pump Download PDFInfo
- Publication number
- CN110953195A CN110953195A CN201911272284.9A CN201911272284A CN110953195A CN 110953195 A CN110953195 A CN 110953195A CN 201911272284 A CN201911272284 A CN 201911272284A CN 110953195 A CN110953195 A CN 110953195A
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- mechanical seal
- flushing
- pressure
- temperature
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/70—Suction grids; Strainers; Dust separation; Cleaning
- F04D29/708—Suction grids; Strainers; Dust separation; Cleaning specially for liquid pumps
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/08—Sealings
- F04D29/086—Sealings especially adapted for liquid pumps
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/58—Cooling; Heating; Diminishing heat transfer
- F04D29/586—Cooling; Heating; Diminishing heat transfer specially adapted for liquid pumps
Abstract
The embodiment of the invention provides a method and a system for flushing a mechanical seal of a pump, and relates to the field of pump flushing. The mechanical seal flushing method of the pump comprises the steps of introducing flushing liquid with preset temperature into a mechanical seal cavity to be cleaned at preset pressure; the preset temperature is higher than the temperature of a working medium in the mechanical seal cavity, and the preset pressure is higher than the operating pressure in the mechanical seal cavity; the mechanical seal flushing system of pump is including the oxygen-eliminating device, pressure device and the cooling device that connect gradually, and the oxygen-eliminating device is arranged in heating the flush fluid and detaches the oxygen in the flush fluid, and pressure device is used for the flush fluid pressurization after will heating and deoxidization, and cooling device is used for cooling to the temperature of predetermineeing with the flush fluid after the pressurization, and cooling device is used for the intercommunication to treat the mechanical seal chamber that washes to the flush fluid that will be greater than the working medium's of mechanical seal intracavity temperature lets in the mechanical seal intracavity of treating washing. The mechanical seal flushing method and the mechanical seal flushing system for the pump can reduce the leakage phenomenon of the mechanical seal and prolong the service life.
Description
Technical Field
The invention relates to the field of pump flushing, in particular to a method and a system for flushing a mechanical seal of a pump.
Background
The mechanical seal is a device for preventing fluid leakage, which is formed by at least one pair of end faces perpendicular to the rotation axis, and the end faces are kept in fit and relatively slide under the action of fluid pressure and the elastic force (or magnetic force) of a compensation mechanism and the cooperation of an auxiliary seal.
The washing of the mechanical seal is an effective way for guaranteeing the lubrication, cooling, impurity cleaning, temperature control and mechanical seal service life of the dynamic and static rings of the mechanical seal.
However, the mechanical seal flushing provided by the related art is prone to leakage of the mechanical seal.
Disclosure of Invention
Objects of the present invention include, for example, providing a method and system for flushing a mechanical seal of a pump that reduces the phenomenon of leakage from the mechanical seal.
Embodiments of the invention may be implemented as follows:
in a first aspect, an embodiment provides a mechanical seal flushing method for a pump, for flushing a condensate pump, including:
introducing a flushing liquid with a preset temperature into a mechanical seal cavity to be cleaned at a preset pressure; the preset temperature is higher than the temperature of the working medium in the mechanical seal cavity, and the preset pressure is higher than the operating pressure in the mechanical seal cavity.
In an alternative embodiment, the predetermined temperature is 80-85 ℃.
In an alternative embodiment, the predetermined pressure is between 0.5 and 0.55 MPa.
In an optional embodiment, before the flushing liquid with a preset temperature is introduced into the mechanical seal cavity to be cleaned at a preset pressure, the method further comprises:
the rinse is heated above a preset temperature and the pressure is increased above a preset pressure.
In an optional embodiment, before the rinsing liquid at a preset temperature is introduced into the mechanical seal cavity to be cleaned at a preset pressure, the method specifically further includes:
the rinse solution is heated to a temperature of not less than 100 ℃ and the pressure is increased to a pressure of not less than 1 MPa.
In an alternative embodiment, the method further comprises: cooling the flushing liquid which is heated to be not lower than 100 ℃ and the pressure of which is not lower than 1MPa to 80-85 ℃, and reducing the pressure to be 0.5-0.55 MPa.
In an alternative embodiment, the method further comprises cooling the rinse solution heated to a temperature of not less than 100 ℃ to a temperature of 80-85 ℃ by using a cooler.
In an optional embodiment, the method further comprises reducing the pressure of the flushing liquid with the pressure not lower than 1MPa to 0.5-0.55MPa by using a pressure reducing valve.
In a second aspect, an embodiment provides a mechanical seal flushing system of a pump, which includes a deaerator, a pressurizing device and a cooling device, wherein the deaerator, the pressurizing device and the cooling device are sequentially connected, the deaerator is used for heating flushing fluid and removing oxygen in the flushing fluid, the pressurizing device is used for pressurizing the heated and deaerated flushing fluid, the cooling device is used for cooling the pressurized flushing fluid to a preset temperature, and the cooling device is used for communicating a mechanical seal cavity to be flushed so as to introduce the flushing fluid at the preset temperature into the mechanical seal cavity to be flushed; the preset temperature is higher than the temperature of the working medium in the mechanical seal cavity.
In an alternative embodiment, at least one of the pipeline connected between the pressurizing device and the cooling device and the pipeline connected between the cooling device and the mechanical seal cavity to be flushed is provided with a pressure reducing valve, so that the pressure of flushing liquid entering the mechanical seal cavity to be flushed is a preset pressure; wherein the preset pressure is greater than the operating pressure in the mechanical seal cavity.
The mechanical seal flushing method of the pump provided by the embodiment of the invention has the beneficial effects that: the mechanical seal flushing method of the pump provided by the embodiment of the invention can be used for flushing the condensate pump, and the medium for normal work of the condensate pump is usually wastewater containing ammonia and hydrogen sulfide; the mechanical seal flushing method adopts flushing fluid with preset temperature, the flushing fluid is introduced into a mechanical seal cavity to be cleaned at preset pressure, and the mechanical seal cavity is flushed, wherein the preset temperature is higher than the temperature of working media in the mechanical seal cavity, and the preset pressure is higher than the operating pressure in the mechanical seal cavity; because the temperature of presetting the temperature of flush fluid is greater than the temperature of the working medium in the mechanical seal intracavity, and predetermine pressure and be greater than the operating pressure in the mechanical seal intracavity, and then can avoid the mechanical seal intracavity originally to contain ammonia and hydrogen sulfide medium because of the low temperature forms the ammonium sulfide crystallization for each sealing member of mechanical seal can not lose the effect under the effect of the solid particle of crystallization, and then is difficult to form the mechanical seal and leaks.
The mechanical seal flushing system of the pump of the embodiment of the invention has the beneficial effects that: the mechanical seal flushing system of the pump comprises a deaerator, a pressurizing device and a cooling device, flushing liquid heated by the deaerator and deaerated is pressurized by the pressurizing device, and then the temperature of the flushing liquid is reduced to a preset temperature through the cooling device, so that the flushing liquid cooled to the preset temperature by the cooling device is introduced into a mechanical seal cavity to be flushed for flushing; because the temperature of presetting the temperature of flush fluid is greater than the temperature of mechanical seal intracavity working medium, and then can avoid the mechanical seal intracavity originally to contain ammonia and hydrogen sulfide medium cooling crystallization for each sealing member of mechanical seal can not lose the effect under the effect of the solid particle of crystallization, and then is difficult to form the machine and seals the leakage.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
Fig. 1 is a schematic structural diagram of a mechanical seal flushing system of a pump in an embodiment of the invention.
Icon: 010-mechanical seal flushing system of pump; 100-a pressurizing device; 110-a deaerator; 200-a cooling device; 210-a pressure reducing valve; 300-condensate pump.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the present invention, it should be noted that if the terms "inside", "outside", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings or the orientation or positional relationship which is usually placed when the product of the present invention is used, the description is merely for convenience of describing the present invention and simplifying the description, but the indication or suggestion that the referred device or element must have a specific orientation, be constructed in a specific orientation and operation, and thus, cannot be understood as the limitation of the present invention.
It should be noted that the features of the embodiments of the present invention may be combined with each other without conflict.
Referring to fig. 1, the present embodiment provides a mechanical seal flushing system 010 for a pump, which can be used for flushing various types of pumps such as a condensate pump 300, so as to ensure lubrication, cooling, impurity cleaning, etc. of a dynamic ring and a static ring of a mechanical seal by flushing.
The mechanical seal flushing system 010 of the pump of the embodiment comprises a deaerator 110, a pressurizing device 100 and a cooling device 200, wherein the deaerator 110, the pressurizing device 100 and the cooling device 200 are sequentially connected, the deaerator 110 is used for heating flushing liquid and removing oxygen in the flushing liquid, the pressurizing device 100 is used for pressurizing the heated and deaerated flushing liquid, the cooling device 200 is used for cooling the pressurized flushing liquid to a preset temperature, and the cooling device 200 is used for communicating a mechanical seal cavity to be flushed so as to introduce the flushing liquid at the preset temperature into the mechanical seal cavity to be flushed; the preset temperature is higher than the temperature of the working medium in the mechanical seal cavity.
When the mechanical seal flushing system 010 of the pump flushes the mechanical seal cavity of the pump, the temperature of the flushing liquid is higher than that of the working medium in the mechanical seal cavity, so that the working medium in the mechanical seal cavity can be prevented from being cooled and crystallized, each sealing element of the mechanical seal cannot lose effect under the action of crystallized solid particles, and the mechanical seal leakage cannot be easily formed.
It should be noted that, the medium when the condensate pump 300 normally works is wastewater containing ammonia and hydrogen sulfide, when the mechanical seal flushing system 010 of the pump of the present invention is used to flush the mechanical seal cavity of the condensate pump 300, the mechanical seal cavity is flushed by the flushing liquid with a temperature greater than that of the working liquid, so as to effectively avoid the cooling crystallization of the wastewater containing ammonia and hydrogen sulfide, and further effectively avoid each sealing element (e.g., a moving ring and a static ring) of the mechanical seal from losing action under the action of crystallized solid particles, so that the mechanical seal will not leak, and further prolong the service life of the pump, for example: the use period can be prolonged from 10-15 days to 2-3 years.
It should be noted that the medium for heating the rinse liquid in the deaerator 110 may be selected from hot steam, so that the rinse liquid can be heated and deaerated smoothly. The pressurizing device 100 is a low-pressure boiler, and the purged rinse liquid after being deaerated is introduced into the pressurizing device 100 to be pressurized, so that the internal components of the pressurizing device 100 can be protected.
The deaerator 110 is configured to heat the rinse liquid to not less than 100 ℃, and the pressurizing device 100 is configured to pressurize the heated and deaerated rinse liquid to a pressure of not less than 1 MPa; then the heated and pressurized rinsing liquid is led to the cooling device 200 for cooling.
The cooling apparatus 200 of the present embodiment includes a water-cooled cooler configured to cool the pressurized rinse liquid of the low-pressure boiler to a preset temperature; specifically, the water-cooled cooler can reduce the temperature of the flushing liquid to 80-85 ℃, and then the flushing liquid with the temperature reduced to 80-85 ℃ can be used for flushing the mechanical seal cavity.
It should be noted that, the medium of the condensate pump 300 during normal operation is wastewater containing ammonia and hydrogen sulfide, and the wastewater containing ammonia and hydrogen sulfide usually starts to crystallize when the temperature is lower than 70 ℃, and the mechanical seal flushing system of the present invention is used to flush the mechanical seal cavity of the condensate pump 300, and the temperature of the flushing liquid is higher than the temperature of the working liquid in the mechanical seal cavity, so as to avoid the wastewater containing ammonia and hydrogen sulfide from cooling and crystallizing, that is, to avoid each sealing member (for example, a moving and static ring) of the mechanical seal from losing effect under the effect of crystallized solid particles, and further to prevent the mechanical seal from leaking.
Further, the pressurizing device 100 and the cooling device 200 are connected through a pipeline, and the cooling device 200 and the mechanical seal cavity to be flushed are also connected through a pipeline; at least one of the pipeline connected between the pressurizing device 100 and the cooling device 200 and the pipeline connected between the cooling device 200 and the mechanical seal cavity to be flushed is provided with a pressure reducing valve 210, so that the pressure of flushing liquid entering the mechanical seal cavity to be flushed is a preset pressure; wherein the preset pressure is greater than the operating pressure in the mechanical seal cavity.
The pressure of the flushing fluid for flushing the mechanical seal cavity is greater than the operating pressure in the mechanical seal cavity, so that the sealing component in the mechanical seal cavity with the large pressure jack-prop can be utilized, the gap generated in the mechanical seal cavity is further avoided, and the conditions of leakage and the like are further avoided.
The pipeline of being connected between pressure device 100 and the cooling device 200 of this embodiment, and the pipeline of being connected between cooling device 200 and the mechanical seal chamber of treating washing all are provided with relief pressure valve 210 to ensure that the flush fluid that gets into the mechanical seal chamber can get into the mechanical seal chamber under the pressure of predetermineeing and wash, pressure when can guaranteeing the flush fluid to get into the mechanical seal chamber is greater than the operating pressure in the mechanical seal chamber, can avoid the pressure range that the pressure of flush fluid surpasses the mechanical seal chamber and can bear again.
It should be noted that, after the low-pressure boiler of this embodiment pressurizes the rinse liquid, the pressure of the rinse liquid will be increased to not less than 1 MPa; the pipe-set pressure relief valve 210 connected between the pressurizing device 100 and the cooling device 200, and the pipe-set pressure relief valve 210 connected between the cooling device 200 and the mechanical seal chamber to be flushed, are together configured such that the pressure of the pressurized flushing liquid is reduced to 0.5-0.55MPa, for example: the pressure reducing valve 210 arranged in the pipeline connected between the pressurizing device 100 and the cooling device 200 reduces the pressure of the flushing liquid to about 0.8MPa, and the pressure reducing valve 210 arranged in the pipeline connected between the cooling device 200 and the mechanical seal cavity to be flushed further reduces the pressure of the flushing liquid to 0.5-0.55 MPa.
It should be further noted that the pressure of the condensate pump 300 during normal operation is usually about 0.45MPa, and when the pressure for flushing the mechanical seal cavity is about 0.5-0.55MPa, on one hand, the mechanical seal cavity can be fully flushed at a higher pressure, so as to further ensure that no crystallization occurs in the mechanical seal cavity and no interference occurs to components such as the stationary ring seat spring; on the other hand, the washing under higher pressure can also avoid the gap between the sealing parts; thereby substantially improving the leakage problem.
It should be noted that, the mechanical seal flushing system 010 of the pump of this embodiment may further include a temperature detection device and a hydraulic detection device, both of which may be disposed on the pipeline connected between the cooling device 200 and the mechanical seal cavity to be flushed, so as to detect the temperature and the pressure of the flushing fluid in the pipeline on the pipeline, and further determine whether the system has a fault according to the detection result, that is, when the temperature of the flushing fluid in the pipeline is equal to the preset temperature and the pressure is equal to the preset pressure, it is determined that the system has no fault, and the mechanical seal cavity to be flushed may be flushed; when at least one of the temperature or the pressure of the flushing liquid in the pipeline does not accord with the preset value, the system is judged to have a fault, and then the flushing can be stopped, and the system is reused after being detected and maintained.
The temperature detection device and the hydraulic pressure detection device are both located at the downstream of the pressure reducing valve 210 on the pipeline connected between the cooling device 200 and the mechanical seal cavity to be flushed, so that the temperature and the pressure of flushing liquid entering the mechanical seal cavity can be detected more accurately.
The temperature detection means may be a thermometer, a temperature sensor, or the like, and the hydraulic pressure detection means may be a hydraulic pressure gauge, a hydraulic pressure sensor, or the like.
When the mechanical seal flushing system 010 of the pump provided by the invention is used for flushing mechanical seal cavities of pumps such as a condensate pump 300 and the like, the flushing liquid is heated and deaerated by the deaerator 110, then the heated flushing liquid is pressurized by the pressurizing device 100, then the pressurized flushing liquid is cooled by the cooling device 200, and the pressure of the flushing liquid is reduced by the pressurizing valve, so that the flushing liquid introduced into the mechanical seal cavity to be flushed can reach the preset temperature and the preset pressure, the mechanical seal flushing system 010 of the pump is convenient to control and operate in use, and the temperature and the pressure of the flushing liquid can also reach the preset values, and the mechanical seal cavity is not easy to leak after being flushed.
The mechanical seal flushing system 010 of the pump provided by this embodiment can be used for flushing the mechanical seal cavity of the pumps such as the condensate pump 300, and the work flow includes: heating the flushing liquid by using a deaerator 110, deaerating, introducing the heated and deaerated flushing liquid into a pressurizing device 100 for pressurizing, and then introducing the pressurized flushing liquid of the pressurizing device 100 into a cooling device 200 for cooling so as to introduce the flushing liquid cooled to a preset temperature into a mechanical seal cavity to be flushed; in the process that the flushing liquid pressurized by the pressurization device 100 flows to the cooling device 200 and flows from the cooling device 200 to the mechanical seal cavity to be flushed, the pressure of the flushing liquid can be reduced through the pressure reducing valve 210, so that the flushing liquid reduced to the preset pressure is introduced into the mechanical seal cavity to be flushed; in this way, the mechanical seal flushing system 010 using the pump can flush the mechanical seal cavity with the flushing fluid at the preset temperature and the preset pressure.
In summary, the mechanical seal flushing system 010 of the pump provided in the embodiment of the present invention includes the deaerator 110, the pressurizing device 100, and the cooling device 200, wherein the flushing liquid heated and deaerated by the deaerator 110 is pressurized by the pressurizing device 100, and then the temperature of the flushing liquid is reduced to the preset temperature by the cooling device 200, so that the flushing liquid cooled to the preset temperature by the cooling device 200 is introduced into the mechanical seal cavity to be flushed for flushing; because the temperature of the working medium in the mechanical seal intracavity is greater than to the temperature of the preset temperature of flush fluid, and then can avoid the medium cooling crystallization that originally contained ammonia, hydrogen sulfide in the mechanical seal intracavity for each sealing member of mechanical seal can not lose the effect under the effect of the solid particle of crystallization, and then is difficult to form the machine and seals the leakage.
The invention also provides a method for flushing the mechanical seal of the pump, which is used for the condensate pump 300; the method comprises the following steps: introducing a flushing liquid with a preset temperature into a mechanical seal cavity to be cleaned at a preset pressure; the preset temperature is higher than the temperature of the working medium in the mechanical seal cavity, and the preset pressure is higher than the operating pressure in the mechanical seal cavity.
Because the temperature of the working medium that the temperature of predetermineeing of flush fluid is greater than the mechanical seal intracavity, and predetermine pressure and be greater than the operating pressure in the mechanical seal intracavity, and then can avoid the medium cooling crystallization that originally contained ammonia and hydrogen sulfide in the mechanical seal intracavity for each sealing member of mechanical seal can not lose the effect under the effect of the solid particle of crystallization, and then is difficult to form the mechanical seal and leaks.
The medium of the condensate pump 300 during normal operation is ammonia-containing and hydrogen sulfide liquid, and ammonia-containing and hydrogen sulfide wastewater starts to crystallize when the temperature is lower than 70 ℃; the preset temperature is 80-85 ℃, so that ammonia and hydrogen sulfide in liquid can be effectively prevented from crystallizing when the mechanical seal cavity is flushed, and the phenomenon that all sealing elements (such as a moving ring and a static ring) of the mechanical seal lose effects under the action of crystallized solid particles is avoided, so that the mechanical seal cannot be leaked.
The pressure of the condensate pump 300 during normal operation is usually about 0.45 MPa; the preset pressure is 0.5-0.55 MPa; when the pressure of the flushing liquid for flushing the mechanical seal cavity is about 0.5-0.55MPa, on one hand, the mechanical seal cavity can be fully flushed under higher pressure so as to further ensure that no crystallization is generated in the mechanical seal cavity and no interference is caused to components such as a static ring seat spring and the like; on the other hand, the washing under higher pressure can also avoid the gap between the sealing parts; thereby substantially improving the leakage problem.
It should be noted that, in the method for flushing the mechanical seal of the pump provided by the present invention, before the flushing liquid at the preset temperature is introduced into the mechanical seal cavity to be cleaned at the preset pressure, the flushing liquid may be heated to a temperature higher than the preset temperature, for example: the temperature is increased to not less than 100 ℃ and the pressure is increased to exceed a preset pressure, for example: increasing the pressure to not less than 1 MPa; then the temperature of the flushing liquid is reduced to the preset temperature of 80-85 ℃, and the pressure is reduced to the preset pressure of 0.5-0.55 MPa.
So, can ensure that the flush fluid that lets in the mechanical seal chamber of treating to wash reaches preset temperature and preset pressure for the mechanical seal rinse-system 010 of this pump is convenient for control and operation when using, and can also ensure that the temperature and the pressure of flush fluid can reach the default, thereby makes the mechanical seal chamber be difficult to the condition that the leakage appears after washing.
It should be noted that, in the method of the present invention, the deaerator 110 may be used to heat the rinse solution, and after the rinse solution is heated, the pressure of the heated rinse solution is increased by using the low-pressure water pump; the rinse liquid heated to more than the preset temperature may be cooled by the cooling device 200, for example: and the water-cooled cooler is cooled to a preset temperature, and the pressure is reduced to a preset pressure by using a pressure reducing valve 210 in the process that the flushing liquid flows from the low-pressure boiler to the cooler and flows from the cooler to the mechanical seal cavity to be flushed.
The flushing liquid can adopt water, and the content of substances which are easy to crystallize, such as ammonia, hydrogen sulfide and the like in the mechanical sealing cavity can be reduced by flushing with water, so that the generation of crystals is reduced; on the other hand, by reducing ammonia and hydrogen sulfide, the generation and leakage of ammonia gas for flushing a workshop can be reduced, and the harm to the environment and personnel is avoided; on the other hand, the waste liquid containing ammonia, hydrogen sulfide and the like in the mechanical sealing cavity can be discharged.
In summary, the mechanical seal flushing method for the pump provided by the embodiment of the present invention can be used for flushing the condensate pump 300, and the medium for normal operation of the condensate pump 300 is usually wastewater containing ammonia and hydrogen sulfide; the mechanical seal flushing method adopts flushing fluid with preset temperature, the flushing fluid is introduced into a mechanical seal cavity to be cleaned at preset pressure, and the mechanical seal cavity is flushed, wherein the preset temperature is higher than the temperature of working media in the mechanical seal cavity, and the preset pressure is higher than the operating pressure in the mechanical seal cavity; because the temperature of the working medium that the temperature of predetermineeing of flush fluid is greater than the mechanical seal intracavity, and predetermine pressure and be greater than the operating pressure in the mechanical seal intracavity, and then can avoid the medium cooling crystallization that originally contained ammonia, hydrogen sulfide in the mechanical seal intracavity for each sealing member of mechanical seal can not lose the effect under the effect of the solid particle of crystallization, and then is difficult to form the mechanical seal and leaks.
The above description is only for the specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (10)
1. A method of flushing a mechanical seal of a pump for flushing a condensate pump, comprising:
introducing a flushing liquid with a preset temperature into a mechanical seal cavity to be cleaned at a preset pressure; the preset temperature is higher than the temperature of working media in the mechanical sealing cavity, and the preset pressure is higher than the operating pressure in the mechanical sealing cavity.
2. The method for flushing a mechanical seal of a pump according to claim 1, characterized in that said preset temperature is comprised between 80 and 85 ℃.
3. The method for flushing a mechanical seal of a pump according to claim 1, wherein said predetermined pressure is between 0.5 and 0.55 MPa.
4. The method for flushing the mechanical seal of the pump according to claim 1, further comprising, before introducing the flushing liquid at the preset temperature into the mechanical seal cavity to be cleaned at the preset pressure:
heating the rinse solution above the preset temperature and increasing the pressure above the preset pressure.
5. The method for flushing the mechanical seal of the pump according to claim 4, wherein before the step of introducing the flushing liquid at the preset temperature into the mechanical seal cavity to be cleaned at the preset pressure, the method further comprises:
heating the flushing liquid to a temperature of not less than 100 ℃ and increasing the pressure to not less than 1 MPa.
6. The method for flushing a mechanical seal of a pump according to claim 5, further comprising: and cooling the flushing liquid which is heated to be not lower than 100 ℃ and has the pressure of not lower than 1MPa to 80-85 ℃, and reducing the pressure to be 0.5-0.55 MPa.
7. The method for flushing a mechanical seal of a pump according to claim 6, further comprising cooling the flushing fluid heated to not less than 100 ℃ to 80-85 ℃ with a cooler.
8. The method for flushing the mechanical seal of the pump according to claim 6, further comprising depressurizing the flushing liquid having a pressure of not lower than 1MPa to 0.5-0.55MPa with a pressure reducing valve.
9. The mechanical seal flushing system of the pump is characterized by comprising a deaerator, a pressurizing device and a cooling device, wherein the deaerator, the pressurizing device and the cooling device are sequentially connected, the deaerator is used for heating flushing liquid and removing oxygen in the flushing liquid, the pressurizing device is used for pressurizing the heated and deaerated flushing liquid, the cooling device is used for cooling the pressurized flushing liquid to a preset temperature, and the cooling device is used for communicating a mechanical seal cavity to be flushed so as to introduce the flushing liquid at the preset temperature into the mechanical seal cavity to be flushed; wherein the preset temperature is higher than the temperature of the working medium in the mechanical seal cavity.
10. The mechanical seal flushing system of a pump according to claim 9, characterized in that at least one of the pipe connected between the pressurizing device and the cooling device and the pipe connected between the cooling device and the mechanical seal cavity to be flushed is provided with a pressure reducing valve so that the pressure of the flushing liquid entering the mechanical seal cavity to be flushed is a preset pressure; wherein the preset pressure is greater than the operating pressure in the mechanical seal cavity.
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| CN201911272284.9A CN110953195A (en) | 2019-12-12 | 2019-12-12 | Method and system for flushing mechanical seal of pump |
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| CN201911272284.9A CN110953195A (en) | 2019-12-12 | 2019-12-12 | Method and system for flushing mechanical seal of pump |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113202822A (en) * | 2021-05-24 | 2021-08-03 | 恒力石化（大连）炼化有限公司 | Device and method for treating mechanical seal leakage of centrifugal pump |
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| CN202597176U (en) * | 2012-03-27 | 2012-12-12 | 上海阿波罗机械股份有限公司 | Structure for eliminating crystals in mechanical sealing chamber of boric acid recirculating pump |
| CN202597258U (en) * | 2012-03-27 | 2012-12-12 | 上海阿波罗机械股份有限公司 | Pump cover for boric acid recirculation pump |
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| CN113202822A (en) * | 2021-05-24 | 2021-08-03 | 恒力石化（大连）炼化有限公司 | Device and method for treating mechanical seal leakage of centrifugal pump |
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