CN109139526B - Method and device for detecting sealing performance of dry gas seal on two end faces of centrifugal compressor - Google Patents
Method and device for detecting sealing performance of dry gas seal on two end faces of centrifugal compressor Download PDFInfo
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- CN109139526B CN109139526B CN201810833314.8A CN201810833314A CN109139526B CN 109139526 B CN109139526 B CN 109139526B CN 201810833314 A CN201810833314 A CN 201810833314A CN 109139526 B CN109139526 B CN 109139526B
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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
- F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
- F04D27/001—Testing thereof; Determination or simulation of flow characteristics; Stall or surge detection, e.g. condition monitoring
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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
- F04D29/002—Details, component parts, or accessories especially adapted for elastic fluid 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
- F04D29/083—Sealings especially adapted for elastic fluid pumps
Abstract
The application discloses a method and a device for detecting sealing performance of double-end-face dry gas seal of a centrifugal compressor, relates to the technical field of centrifugal compressors, and can realize detection of the whole gas sealing performance of a centrifugal compressor unit after the double-end-face dry gas seal is assembled with the centrifugal compressor. The method comprises the following steps: after the double-end-face dry gas seal is assembled with the centrifugal compressor, sealing gas is filled into a sealing gas area of the dry gas seal and isolation gas is filled into an isolation gas area, and the pressure of the isolation gas and the pressure of the sealing gas meet the pressure standard when the double-end-face dry gas seal of the centrifugal compressor normally operates; the sealing performance of the double-end-face dry gas seal of the centrifugal compressor is determined by respectively monitoring the pipeline pressure and the air input of the sealing gas area and the isolating gas area and combining the air displacement of the double-end-face dry gas seal. The application is suitable for detecting the sealing performance of the dry gas seal of the double end faces of the centrifugal compressor.
Description
Technical Field
The application relates to the technical field of centrifugal compressors, in particular to a method and a device for detecting the sealing performance of a double-end-face dry gas seal of a centrifugal compressor.
Background
The centrifugal compressor is an important strategic device, and is widely applied to chemical processes of oil refining, chemical fertilizers, refrigeration, Liquefied Natural Gas (LNG) and the like. The working media are commonly as follows: ammonia, propylene, natural gas, petroleum rich gas, carbon monoxide, methanol, ethylene, hydrogen and the like, wherein a plurality of media have the characteristics of flammability, explosiveness, toxicity, harm and the like.
In order to ensure the safety of the centrifugal compressor, a double-end-face dry gas seal is commonly used as a shaft end seal to ensure that working media of a unit cannot leak out of the unit, so that potential safety hazards and environmental pollution are avoided. This seal acts as an external leakage prevention shaft end seal, and the sealing performance of the gas and the reliability of the sealing operation are very important.
Currently, such a double-end-face dry gas seal must be produced in qualified manufacturing plants, and after the production is completed, a gas sealing performance test must be performed in the manufacturing plants to ensure the safety of the seal. After the casing of the centrifugal compressor is produced in a centrifugal compressor factory, a gas sealing performance test needs to be carried out in the centrifugal compressor factory to ensure that the gas sealing performance and the working medium of the casing of the centrifugal compressor cannot leak outwards. However, when the double-end-face dry gas seal is assembled with the centrifugal compressor, no effective detection means exists for the overall sealing performance of the centrifugal compressor unit.
Disclosure of Invention
In view of this, the present application provides a method and an apparatus for detecting sealing performance of a double-end-face dry gas seal of a centrifugal compressor, and mainly aims to solve the problem that no effective detection means exists for the overall sealing performance of a centrifugal compressor unit after the double-end-face dry gas seal is assembled with the centrifugal compressor.
According to one aspect of the application, a method for detecting the sealing performance of a double-end-face dry gas seal of a centrifugal compressor is provided, and the method comprises the following steps:
cleaning impurities in a cavity of the centrifugal compressor;
installing a main machine part of the centrifugal compressor, installing a double-end-face dry gas seal on a corresponding position of the centrifugal compressor by using a special dry gas seal tool, and installing corresponding pipe fittings and matched detection equipment, wherein the double-end-face dry gas seal comprises a seal gas area and an isolation gas area;
filling sealing gas corresponding to the double-end-face dry gas seal into the sealing gas area, and enabling the pressure of the sealing gas to meet a preset test pressure standard;
filling the isolated gas area with isolated gas corresponding to the double-end-face dry gas seal, and enabling the pressure of the isolated gas and the pressure of the seal gas to meet the pressure standard when the double-end-face dry gas seal of the centrifugal compressor normally operates;
and determining the sealing performance of the double-end-face dry gas seal of the centrifugal compressor by respectively monitoring the pipeline pressure and the air input of the sealing gas area and the isolating gas area and combining the air displacement of the double-end-face dry gas seal.
In accordance with another aspect of the present application, there is provided a sealing performance detecting apparatus of a centrifugal compressor double-end-face dry gas seal, the apparatus including:
the cleaning unit is used for cleaning impurities in the cavity of the centrifugal compressor;
the installation unit is used for installing a main machine part of the centrifugal compressor, installing a double-end-face dry gas seal on a corresponding position of the centrifugal compressor by using a special dry gas seal tool, and installing corresponding pipe fittings and matched detection equipment, wherein the double-end-face dry gas seal comprises a seal gas area and an isolation gas area;
the inflation unit is used for inflating the sealing gas corresponding to the double-end-face dry gas seal into the sealing gas area and enabling the pressure of the sealing gas to meet a preset test pressure standard;
the inflation unit is also used for inflating the isolation gas corresponding to the double-end-face dry gas seal into the isolation gas area, and enabling the pressure of the isolation gas and the pressure of the seal gas to meet the pressure standard when the double-end-face dry gas seal of the centrifugal compressor normally operates;
and the monitoring unit is used for determining the sealing performance of the double-end-face dry gas seal of the centrifugal compressor by respectively monitoring the pipeline pressure and the air input of the sealing gas area and the isolating gas area and combining the air displacement of the double-end-face dry gas seal.
According to yet another aspect of the present application, there is provided a storage device having stored thereon a computer program which, when executed by a processor, implements the above-described method of sealing performance detection of a centrifugal compressor double-ended dry gas seal.
According to another aspect of the present application, there is provided a physical device for detecting sealing performance of a double-end-face dry gas seal of a centrifugal compressor, comprising a storage device, a processor and a computer program stored on the storage device and executable on the processor, wherein the processor implements the method for detecting sealing performance of a double-end-face dry gas seal of a centrifugal compressor when executing the program.
By means of the technical scheme, the method and the device for detecting the sealing performance of the double-end-face dry gas seal of the centrifugal compressor are characterized in that firstly, impurity cleaning is carried out on a cavity of the centrifugal compressor, after the double-end-face dry gas seal is assembled with the centrifugal compressor, corresponding pipe fittings and matched detection equipment are connected, then sealing gas and isolating gas are respectively filled into a sealing gas area and an isolating gas area of the double-end-face dry gas seal, finally, the sealing performance of the double-end-face dry gas seal of the centrifugal compressor is determined by respectively monitoring the pipeline pressure and the air input amount of the sealing gas area and the isolating gas area and combining the air output of the double-end-face dry gas seal, the effective detection of the overall sealing performance of a unit after the double-end-face dry gas seal and the centrifugal compressor are assembled is realized, the qualified sealing performance of the dry gas seal and the matching position of a, Whether the working face of the dry gas seal with the double end faces works normally or not, whether each performance index of the dry gas seal meets expectations or not and the like.
The foregoing description is only an overview of the technical solutions of the present application, and the present application can be implemented according to the content of the description in order to make the technical means of the present application more clearly understood, and the following detailed description of the present application is given in order to make the above and other objects, features, and advantages of the present application more clearly understandable.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the application. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:
fig. 1 is a schematic flow chart illustrating a method for detecting sealing performance of a double-end-face dry gas seal of a centrifugal compressor according to an embodiment of the present application;
FIG. 2 illustrates an example schematic diagram of an assembled overall gas sealing performance test of a double-end-face dry gas seal and a centrifugal compressor provided by an embodiment of the present application;
fig. 3 is a schematic structural diagram illustrating a sealing performance detection apparatus of a centrifugal compressor double-end-face dry gas seal according to an embodiment of the present application;
fig. 4 shows a physical structure schematic diagram of a sealing performance detection device of a centrifugal compressor double-end-face dry gas seal provided by an embodiment of the application.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
In order to solve the problem that no effective detection means exists for the overall gas sealing performance of a centrifugal compressor unit at present after a double-end-face dry gas seal and a centrifugal compressor are assembled, the embodiment provides a method for detecting the sealing performance of the double-end-face dry gas seal of the centrifugal compressor, which combines static gas to detect the dry gas sealing performance so as to ensure the overall gas sealing performance of the double-end-face dry gas seal and the centrifugal compressor after the assembly and can provide main performance indexes for detecting the sealing, as shown in fig. 1, the method comprises the following steps:
101. and cleaning impurities in the cavity of the centrifugal compressor.
For this embodiment, before the double-end-face dry gas seal and the centrifugal compressor are assembled, impurities, burrs, grease and the like in the cavity of the centrifugal compressor need to be cleaned, so that the sealing performance of the dry gas seal is prevented from being affected, and the accuracy of detecting the sealing performance of the double-end-face dry gas seal is ensured. The execution main body of the embodiment may be a device or equipment for detecting the sealing performance of the double-end-face dry gas seal of the centrifugal compressor, and the process shown in the embodiment is triggered after receiving a corresponding detection instruction.
In order to achieve a better impurity cleaning effect, as a preferred mode, the step 101 may specifically include: polishing a dry gas sealing area cavity of the centrifugal compressor; and cleaning the cavity of the main engine region of the centrifugal compressor and the cavity of the dry gas sealing region. For example, a cavity in a dry gas sealing area of the compressor is polished to ensure that the inside is smooth and burr-free; cleaning a compressor cavity to ensure the cavity to be clean; and cleaning the cavity of the dry gas sealing area of the compressor, and ensuring that the cavity is clean and is not allowed to have impurities or grease substances.
102. Installing a main machine part of the centrifugal compressor, installing double-end-face dry gas seal on the corresponding position of the centrifugal compressor by using a special dry gas seal tool, and installing corresponding pipe fittings and matched detection equipment.
The double-end-face dry gas seal comprises a sealing gas area and an isolating gas area, wherein the sealing gas area is close to a main machine part of the centrifugal compressor, and the isolating gas area is arranged on the outer side of the sealing gas area. The function of the isolation gas is that after the double-end-face dry gas seal is assembled with the centrifugal compressor, impurities are isolated from entering the seal gas area when the unit normally operates, so that the dry gas seal is prevented from being damaged, and meanwhile, the requirement for detecting the sealing performance, namely the pressure difference between the air and the seal gas, is met.
The matched detection equipment can comprise a pressure gauge, a flow meter and the like; the plumbing may include fittings, piping, valves, and the like. To this embodiment, before installing pipe fitting and supporting check out test set, need clear up these pipe fitting and supporting check out test set, avoid the sealing performance of dry gas seal to receive the influence to guarantee that the sealing performance of bi-polar face dry gas seal detects the accuracy.
Through the installation process, the assembly of the double-end-face dry gas seal and the centrifugal compressor can be realized, and after the assembly is completed, in order to ensure the correct assembly, as a preferred mode, the embodiment may further include: detecting whether a main machine area, a double-end-face dry gas seal, corresponding pipe fittings and matched detection equipment of the centrifugal compressor are correctly installed or not; and if the installation is incorrect, carrying out corresponding adjustment, and if the installation is correct, carrying out next inflation operation.
For example, it is possible to detect whether the main body area, the double-end-face dry gas seal, the corresponding pipe fitting, and the associated detection device of the centrifugal compressor are correctly installed according to the dimensions on the installation drawing, and if not, it is necessary to perform installation adjustment to ensure that there is no leakage.
103. And filling the sealing gas area with sealing gas corresponding to the double-end-face dry sealing, and enabling the pressure of the sealing gas to meet the preset test pressure standard.
The type of the sealing gas filled into the sealing gas area can be selected in advance according to actual requirements for standby. The predetermined test pressure standard may be preset with reference to a historical test pressure standard and a factory-set test pressure standard. In the embodiment, the sealing gas area of the double-end-face dry gas seal is filled with the sealing gas meeting the preset test pressure standard so as to detect the sealing performance of the dry gas seal.
104. And filling the isolation gas corresponding to the double-end-face dry gas seal into the isolation gas area, and enabling the pressure of the isolation gas and the pressure of the seal gas to meet the pressure standard when the double-end-face dry gas seal of the centrifugal compressor normally operates.
The type of the barrier gas filled into the barrier gas area can be selected in advance according to actual requirements for standby. In this embodiment, the isolation gas region of the double-end-face dry gas seal is filled with the isolation gas meeting the test requirements for isolating impurities from entering the seal gas region, thereby avoiding damaging the dry gas seal.
105. The sealing performance of the double-end-face dry gas seal of the centrifugal compressor is determined by respectively monitoring the pipeline pressure and the air input of the sealing gas area and the isolating gas area and combining the air displacement of the double-end-face dry gas seal.
For the embodiment, after the sealing performance of the double-end-face dry gas seal of the centrifugal compressor is determined, a corresponding detection report can be generated and fed back to relevant workers. If the sealing leakage is detected, alarm information such as characters, pictures, audio, video, light, vibration and the like can be output, and the reason of the sealing leakage and the corresponding solving measure can be fed back at the same time of feeding back a detection report.
To illustrate the implementation process of step 105, as a preferred mode, step 105 may specifically include: detecting whether the inlet pressures of the sealing gas area and the isolating gas area can be maintained under the preset pressure condition; if the inlet pressures of the sealing gas area and the isolation gas area can be maintained under the preset pressure condition, determining that the double-end-face dry gas seal does not leak; and if the inlet pressures of the sealing gas area and the isolation gas area cannot be maintained under the preset pressure condition, determining that the double-end-face dry gas seal has seal leakage.
For example, whether the inlet pressures of the seal gas area and the isolation gas area can be maintained under the set pressure condition or not, namely the pressure cannot be reduced, if the pressure is reduced, the seal leakage of the double-end-face dry gas seal is indicated; if the pressure is not reduced, the sealing performance of the double-end-face dry gas seal is good.
It should be noted that, before the inlet pressure measurement of the seal gas region, the pressure in the pressure gauge at the inlet of the seal gas region needs to be adjusted to the maximum static pressure of the dry gas seal, and then the inlet pressure measurement of the seal gas region is performed, so that the requirement for the detection condition of the sealing performance of the dry gas seal can be met, and the detection accuracy of the sealing performance of the dry gas seal can be improved. Wherein, the maximum static pressure of the dry gas seal can be provided by a seal design department according to theoretical data analysis.
Further, as the expansion and refinement of the embodiment, in order to facilitate the detection of the sealing performance of the dry gas seal of the two end faces of the centrifugal compressor, the seal gas and the isolation gas respectively filled in the seal gas area and the isolation gas area of the dry gas seal may both adopt nitrogen. Correspondingly, step 105 may further specifically include: acquiring the total gas consumption consumed by filling nitrogen into the seal gas area and the isolation gas area; then calculating the sum of the air inflow of the seal gas area and the air inflow of the isolation gas area, and comparing the obtained sum with the total air consumption consumed by filling nitrogen; if the sum is equal to the total gas consumption, determining that the gas charging pipeline corresponding to the double-end-face dry gas seal has no seal leakage; and if the sum is smaller than the total gas consumption, determining that the gas charging pipeline corresponding to the double-end-face dry gas seal has seal leakage.
Because the sealing gas area and the isolating gas area sealed by the dry gas are filled with nitrogen, a main pipeline can be adopted to charge the nitrogen, and then the nitrogen flows through respective branch pipelines of the sealing gas area and the isolating gas area to reach the sealing gas area and the isolating gas area, so that the sealing gas area is filled with the sealing gas and the isolating gas area is filled with the isolating gas, and if the total nitrogen consumption of the main pipeline is equal to the sum of the nitrogen filled in the two areas, the sealing performance of the gas filling pipeline is good; if the total nitrogen consumption of the main pipeline is greater than the sum of the nitrogen filled in the two areas, the sealing leakage of the inflation pipeline is indicated, namely the pipeline is leaked.
It should be noted that, when measuring the intake air amount of the seal air region, the intake air amount needs to be compared with the dry air seal static air leakage amount of the preset standard, wherein the dry air seal static air leakage amount of the preset standard can be provided by a seal design department according to theoretical data analysis. If the measured value of the air inflow of the seal air region is less than or equal to the dry air seal static air leakage of the preset standard, determining the measured value of the air inflow of the seal air region as the air inflow of the seal air region; and if the measured value of the air inflow of the sealing air region is larger than the dry air sealing static air leakage of the preset standard, determining that the measured value of the air inflow of the sealing air region is an unqualified value. By the method, the measured air inflow of the sealing air region can be ensured to meet the standard, and the accurate detection of the sealing performance of the dry air sealing is realized.
Furthermore, the centrifugal compressor and the double-end-face dry gas seal are assembled and then are configured with a dry gas seal isolation seal and a centrifugal compressor shaft end seal, and the isolation seal and the shaft end seal are of the same seal type as a comb tooth seal. In an actual scene, the centrifugal compressor and the double-end-face dry gas seal are assembled and then configured with a dry gas seal isolation seal and a centrifugal compressor shaft end seal. The seal type of the dry gas seal isolation seal is comb seal, air leakage exists certainly, the air leakage direction is air leakage from the right side of the isolation seal to the direction of the bearing oil discharge area, the air leakage at the position can be calculated out by a formula, theoretical air leakage can be calculated out by the aid of the formula (relative accurate theory has deviation with practice, the left side of the seal is the oil discharge area of the bearing, the pressure of the oil discharge area can be considered as atmospheric pressure, the right side pressure of the seal can be considered as sealing air pressure of the seal, the air leakage can be calculated out by knowing the number of the seal gaps and the seal teeth, the data is provided by a seal factory, the type of the shaft end seal of the centrifugal compressor is comb seal, the seal is used for isolating process gas and dry gas seal internal gas in the compressor, the air leakage from the dry gas seal side to the compressor side is also necessary, and the molecular weight of nitrogen is larger due to more tooth, the air leakage is relatively small and can be considered or not considered, if the left side of the seal is considered to be isolation air pressure, the right side of the seal can be considered to be atmospheric pressure, and the air leakage can be calculated by knowing the gap and the tooth number of the seal.
In the foregoing scenario, as a preferable mode, step 105 may further include: calculating the sum of the isolated gas quantity of the isolated gas area and the sealed gas quantity of the double-end-face dry gas seal to obtain Q1; calculating the sum of the exhaust air volume of the double-end-face dry gas seal, the air leakage volume of the isolation seal and the air leakage volume of the shaft end seal to obtain Q2; judging whether the difference between the difference obtained by subtracting the theoretical air leakage of the shaft end seal from the Q1 by the Q2 and the air leakage of the dry air seal isolation seal is smaller than a preset threshold value, namely whether the difference is approximately equal to the air leakage of the dry air seal isolation seal; if yes, comparing the difference value with the air leakage of the isolation seal of the sealing plant to judge whether the air leakage is qualified. By the method, the isolation sealing condition of the double-end-face dry gas seal can be accurately judged.
In order to ensure a difference between the air inflow of the isolated air region and the air displacement of the double-end-face dry-gas seal, the air leakage of the double-end-face dry-gas seal can be accurately used as an optional mode, and the process specifically comprises the following steps: comparing the difference with a preset standard dry gas seal isolation air leakage amount, wherein the preset standard dry gas seal isolation air leakage amount can be provided by a seal design department according to theoretical data analysis; if the difference is less than or equal to the dry gas seal isolation air leakage amount of the preset standard, taking the difference as the air leakage amount of the double-end-face dry gas seal isolation seal; and if the difference is greater than the dry gas seal isolation air leakage of the preset standard, determining that the difference is an unqualified value. By the method, the air leakage amount of the obtained double-end-face dry-gas sealing isolation seal can be ensured to meet the standard, and accurate parameter detection of the sealing performance of the dry-gas sealing is realized.
To facilitate understanding of the specific implementation process of the present embodiment, the following application scenarios are given, but not limited to:
for example, as shown in fig. 2, an exemplary schematic diagram of the detection of the overall gas sealing performance of the assembled double-end-face dry gas seal and centrifugal compressor is divided into a driving-side seal and a non-driving-side seal according to the position between the centrifugal compressor and the driving machine.
Y1, Y2, Y3 and Y4 are respectively an inlet and an outlet of the centrifugal compressor and need to be sealed by blind flanges;
s1 and S1' are primary balance air ports of the centrifugal compressor and need to be connected together by connecting pipes;
s, S' is a secondary balance air port of the centrifugal compressor and needs to be sealed by a blind flange;
A. a' is an isolating gas inlet, and isolating nitrogen is filled;
B. b' is a dry gas sealing gas inlet, and sealing nitrogen is filled;
C. c' is a dry gas sealing exhaust port, and is connected with a pressure gauge and a flowmeter;
D. d' is a dry gas sealing and isolating gas port and is sealed by a flange cover;
p, P' is a drainage port, and is sealed by a flange cover.
The devices in fig. 2 are a nitrogen source M (usually bottled nitrogen, the pressure is higher than the test pressure), a gate valve 1 (a switch for controlling the nitrogen source to release gas), a filter 2 (because the sealing requirement precision is high, the filtering precision is 1 micron through the filter), a pressure reducing valve 3 (for reducing the pressure of the filled nitrogen to ensure the test safety), a flowmeter 4 (for monitoring the total air inflow of the nitrogen), a pressure regulating valve 5 (for regulating the pressure of the isolation gas so that the pressure of the isolation gas and the pressure of the seal gas meet the pressure standard when the dry gas seal of the two end faces of the centrifugal compressor normally operates), a flowmeter 6 (for monitoring the air inflow of the isolation gas), a pressure regulating valve 7 (for regulating the pressure of the seal gas so that the gas pressure reaches the test pressure), a flowmeter 8 (for monitoring the air inflow of the seal gas), a flowmeter 9 (for monitoring the flow of the dry, Pressure gauge G1 (to monitor the pressure in the main line), pressure gauges G2, G3 (to monitor the pressure in the branch lines).
Based on the example in fig. 2, there may be a determination method as follows:
a. whether the pressure of G3 can be maintained under the set pressure condition (namely the pressure does not drop) can be judged through G2, and whether the sealing leakage exists can be judged;
b. the flow meter 4 monitors the total gas consumption;
c. the flow meter 6 monitors the gas consumption of the barrier gas;
d. the flow meter 8 monitors the consumption of seal gas (i.e., the total leakage of the dry seal);
e. the flow meter 9 monitors the sealed exhaust gas amount;
f. whether the sum of the flow monitored by the flowmeter 6 and the flow monitored by the flowmeter 8 is equal to the flow monitored by the flowmeter 4 or not can be judged, and whether the pipeline is sealed and leaked or not can be judged;
g. the flow meter 8 monitors the flow-the flow meter 9 monitors the flow difference approximately equal to the leakage of the dry gas seal isolation seal.
Description of the drawings: 1) the pressure in gauge G3 should be adjusted to the dry gas seal maximum static pressure, which is provided by the seal design unit;
2) the flow displayed by the flowmeter 8 is compared with the dry gas sealing static air leakage provided by a sealing design unit; the flow displayed by the flowmeter 8 is not more than the dry gas sealing static air leakage amount and is qualified;
3) the flow meter 7-the flow meter 9 is approximately equal to the air leakage of the dry gas seal isolation seal, and the numerical value is an actual measurement value; the air leakage quantity is required to be compared with the dry gas sealing and isolating air leakage quantity provided by a sealing design unit, and the air leakage quantity is qualified when the air leakage quantity is less than the value.
4) And (3) calculating the air leakage amount by the flowmeter 8+ the flowmeter 6-the flowmeter 9-shaft end sealing theory, namely the dry gas sealing isolation sealing air leakage amount, and comparing the calculated air leakage amount with the theoretical dry gas sealing isolation sealing air leakage amount provided by a sealing factory to judge whether the air leakage amount is qualified.
Compared with the existing mode, the method for detecting the sealing performance of the double-end-face dry gas seal and centrifugal compressor combined static gas realizes effective detection of the overall sealing performance of the unit after the double-end-face dry gas seal and the centrifugal compressor are assembled, and can provide guidance bases that the sealing performance of the matching position of the dry gas seal and the shell is qualified, whether the working face of the dry gas seal on the double end faces works normally, whether various performance indexes of the dry gas seal meet expectations and the like, so that the overall gas sealing performance of the double-end-face dry gas seal and the centrifugal compressor after the assembly is ensured, and main performance indexes for sealing inspection can be provided.
Further, as a specific implementation of the method in fig. 1, the present embodiment provides a sealing performance detection apparatus for a double-end-face dry gas seal of a centrifugal compressor, as shown in fig. 3, where the apparatus includes: cleaning unit 21, installation unit 22, inflation unit 23, monitoring unit 24.
The cleaning unit 21 can be used for cleaning impurities in the cavity of the centrifugal compressor;
the installation unit 22 can be used for installing a main machine part of the centrifugal compressor, installing a double-end-face dry gas seal on a corresponding position of the centrifugal compressor by using a special dry gas seal tool, and installing corresponding pipe fittings and matched detection equipment, wherein the double-end-face dry gas seal comprises a seal gas area and an isolation gas area;
the inflation unit 23 can be used for inflating the sealing gas corresponding to the double-end-face dry sealing into the sealing gas area and enabling the pressure of the sealing gas to meet a preset test pressure standard;
the inflation unit 23 can also be used for inflating the isolation gas corresponding to the double-end-face dry gas seal into the isolation gas area, and enabling the pressure of the isolation gas and the pressure of the seal gas to meet the pressure standard when the double-end-face dry gas seal of the centrifugal compressor normally operates;
the monitoring unit 24 may be configured to determine the sealing performance of the double-end-face dry gas seal of the centrifugal compressor by monitoring the line pressure and the intake air amount of the seal gas region and the barrier gas region, respectively, and combining the exhaust amount of the double-end-face dry gas seal.
In a specific application scenario, the monitoring unit 24 may be specifically configured to detect whether the inlet pressures of the seal gas region and the barrier gas region can be maintained under a predetermined pressure condition; if the inlet pressures of the sealing gas area and the isolation gas area can be maintained under the preset pressure condition, determining that the double-end-face dry gas seal does not have seal leakage; and if the inlet pressures of the sealing gas area and the isolation gas area cannot be maintained under the preset pressure condition, determining that the double-end-face dry gas seal has seal leakage.
In a specific application scenario, the seal gas and the isolation gas corresponding to the dry gas seal are both nitrogen, and the monitoring unit 24 may be further configured to obtain a total gas consumption consumed by filling the seal gas region and the isolation gas region with nitrogen; calculating the sum of the air inflow of the seal air region and the air inflow of the isolation air region, and comparing the obtained sum with the total air consumption; if the sum value is equal to the total gas consumption, determining that the gas charging pipeline corresponding to the double-end-face dry gas seal has no seal leakage; and if the sum value is smaller than the total gas consumption, determining that the gas charging pipeline corresponding to the double-end-face dry gas seal has seal leakage.
In a specific application scenario, after the centrifugal compressor and the double-end-face dry gas seal are assembled, a dry gas seal isolation seal and a centrifugal compressor shaft end seal are configured, the isolation seal and the shaft end seal are of the same seal type of comb tooth seal, and the monitoring unit 24 can be specifically used for calculating the sum of the isolation gas quantity of an isolation gas area and the sealing gas quantity of the double-end-face dry gas seal to obtain Q1; calculating the sum of the exhaust air volume of the double-end-face dry gas seal, the air leakage volume of the isolation seal and the air leakage volume of the shaft end seal to obtain Q2; judging whether the difference between the theoretical air leakage of the shaft end seal subtracted from the Q2 and the difference between the theoretical air leakage of the shaft end seal subtracted from the Q1 and the theoretical air leakage of the dry gas seal isolation seal is smaller than a preset threshold value or not; if yes, comparing the difference value with the air leakage of the isolation seal of the sealing plant to judge whether the air leakage is qualified.
In a specific application scenario, the monitoring unit 24 may be specifically configured to compare the measured intake air amount in the sealed air region with a preset standard dry air sealed static air leakage amount; if the measured value of the air inflow of the seal air region is less than or equal to the dry air seal static air leakage of the preset standard, determining the measured value of the air inflow of the seal air region as the air inflow of the seal air region; and if the measured value of the air inflow of the sealing air region is larger than the dry air sealing static air leakage of the preset standard, determining that the measured value of the air inflow of the sealing air region is an unqualified value.
In a specific application scenario, the monitoring unit 24 may be further configured to adjust the pressure in the pressure gauge at the inlet of the seal gas region to a dry gas seal maximum static pressure before the inlet pressure measurement of the seal gas region.
In a specific application scenario, the cleaning unit 21 may be specifically used for polishing a dry gas seal area cavity of the centrifugal compressor; cleaning a partial cavity of a centrifugal compressor main machine and a dry gas sealing area cavity;
in a specific application scenario, the mounting unit 22 may also be configured to detect whether the host portion, the double-end-face dry gas seal, the corresponding pipe fitting, and the associated detection device of the centrifugal compressor are correctly mounted before the sealing gas corresponding to the double-end-face dry gas seal is charged into the sealing gas region; if the installation is incorrect, corresponding adjustment is carried out;
accordingly, the inflation unit 23 may be specifically configured to inflate the sealing gas area with the sealing gas corresponding to the double-end-face dry sealing if the installation is correct.
It should be noted that other corresponding descriptions of the functional units related to the sealing performance detection device for the double-end-face dry gas seal of the centrifugal compressor provided in the embodiment of the present application may refer to the corresponding descriptions in fig. 1 and fig. 2, and are not described herein again.
Based on the method shown in fig. 1 and fig. 2, correspondingly, the embodiment of the application also provides a storage device, on which a computer program is stored, and the program is executed by a processor to implement the method for detecting the sealing performance of the double-end dry gas seal of the centrifugal compressor shown in fig. 1 and fig. 2.
Based on the above embodiments of the method shown in fig. 1 and fig. 2 and the virtual device shown in fig. 3, the present application further provides a physical device for detecting the sealing performance of a double-end-face dry gas seal of a centrifugal compressor, as shown in fig. 4, the device includes: a processor 31, a storage device 32, and a computer program stored on the storage device 32 and executable on the processor 31, the processor 31 implementing the method for detecting the sealing performance of a double-end dry gas seal of a centrifugal compressor shown in fig. 1 and 2 when executing the program; the device also includes: a bus 33 configured to couple the processor 31 and the storage device 32.
Through the technical scheme, compared with the prior art, the method and the device have the advantages that the effective detection of the overall sealing performance of the unit after the double-end-face dry gas seal and the centrifugal compressor are assembled is realized, the guidance basis that the sealing performance of the matching position of the dry gas seal and the shell is qualified, whether the working of the dry gas seal working face of the double end faces is normal, whether various performance indexes of the dry gas seal meet expectations and the like can be given, the overall gas sealing performance after the double-end-face dry gas seal and the centrifugal compressor are assembled is ensured, and the main performance indexes for detecting the seal can be given.
Through the above description of the embodiments, those skilled in the art will clearly understand that the present application can be implemented by hardware, and also by software plus a necessary general hardware platform. Based on such understanding, the technical solution of the present application may be embodied in the form of a software product, which may be stored in a non-volatile storage medium (which may be a CD-ROM, a usb disk, a removable hard disk, etc.), and includes several instructions for enabling a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the method according to the implementation scenarios of the present application.
Those skilled in the art will appreciate that the figures are merely schematic representations of one preferred implementation scenario and that the blocks or flow diagrams in the figures are not necessarily required to practice the present application.
Those skilled in the art will appreciate that the modules in the devices in the implementation scenario may be distributed in the devices in the implementation scenario according to the description of the implementation scenario, or may be located in one or more devices different from the present implementation scenario with corresponding changes. The modules of the implementation scenario may be combined into one module, or may be further split into a plurality of sub-modules.
The above application serial numbers are for description purposes only and do not represent the superiority or inferiority of the implementation scenarios.
The above disclosure is only a few specific implementation scenarios of the present application, but the present application is not limited thereto, and any variations that can be made by those skilled in the art are intended to fall within the scope of the present application.
Claims (10)
1. A method for detecting the sealing performance of a dry gas seal of two end faces of a centrifugal compressor is characterized by comprising the following steps:
cleaning impurities in a cavity of the centrifugal compressor;
installing a main machine part of the centrifugal compressor, installing a double-end-face dry gas seal on a corresponding position of the centrifugal compressor by using a special dry gas seal tool, and installing corresponding pipe fittings and matched detection equipment, wherein the double-end-face dry gas seal comprises a seal gas area and an isolation gas area;
filling sealing gas corresponding to the double-end-face dry gas seal into the sealing gas area, and enabling the pressure of the sealing gas to meet a preset test pressure standard;
filling the isolated gas area with isolated gas corresponding to the double-end-face dry gas seal, and enabling the pressure of the isolated gas and the pressure of the seal gas to meet the pressure standard when the double-end-face dry gas seal of the centrifugal compressor normally operates;
and determining the sealing performance of the double-end-face dry gas seal of the centrifugal compressor by respectively monitoring the pipeline pressure and the air input of the sealing gas area and the isolating gas area and combining the air displacement of the double-end-face dry gas seal.
2. The method of claim 1, wherein the determining the sealing performance of the centrifugal compressor double-end-face dry gas seal by monitoring the line pressure and the inlet air volume of the seal gas zone and the barrier gas zone, respectively, in combination with the displacement of the double-end-face dry gas seal comprises:
detecting whether the inlet pressures of the seal gas area and the isolation gas area can be maintained under the preset pressure condition;
determining that the double-end-face dry gas seal does not have seal leakage if the inlet pressures of the seal gas zone and the isolation gas zone can be maintained under a predetermined pressure condition;
and if the inlet pressures of the sealing gas area and the isolating gas area cannot be maintained under the preset pressure condition, determining that the double-end-face dry gas seal has seal leakage.
3. The method of claim 2, wherein the seal gas and the barrier gas corresponding to the double-end-face dry gas seal both use nitrogen gas, and the sealing performance of the double-end-face dry gas seal of the centrifugal compressor is determined by monitoring the line pressure and the intake air amount of the seal gas region and the barrier gas region respectively and combining the exhaust air amount of the double-end-face dry gas seal, and specifically comprises:
acquiring the total gas consumption consumed by filling nitrogen into the seal gas area and the isolation gas area;
calculating the sum of the air inflow of the seal gas area and the air inflow of the isolation gas area, and comparing the obtained sum with the total air consumption;
if the sum is equal to the total gas consumption, determining that the gas charging pipeline corresponding to the double-end-face dry gas seal has no seal leakage;
and if the sum is smaller than the total gas consumption, determining that the gas charging pipeline corresponding to the double-end-face dry gas seal has seal leakage.
4. The method of claim 3, wherein the centrifugal compressor is configured with an isolation seal and a centrifugal compressor shaft end seal after assembly with a double-ended dry gas seal, the isolation seal and the shaft end seal being of the same seal type as a comb seal.
5. The method according to any one of claims 3 to 4, characterized in that the measured value of the air intake amount of the seal gas area is compared with the dry gas seal static air leakage amount of a preset standard;
if the measured value of the air inflow of the seal air region is less than or equal to the dry air seal static air leakage of the preset standard, determining the measured value of the air inflow of the seal air region as the air inflow of the seal air region;
and if the measured value of the air inflow of the sealing air region is larger than the dry air sealing static air leakage of the preset standard, determining that the measured value of the air inflow of the sealing air region is an unqualified value.
6. The method of claim 2, wherein the pressure in a pressure gauge at the seal gas zone inlet is adjusted to a dry gas seal maximum static pressure prior to the inlet pressure measurement of the seal gas zone.
7. The method according to claim 1, wherein the cleaning of impurities from the cavity of the centrifugal compressor comprises:
polishing the dry gas sealing area cavity of the centrifugal compressor;
cleaning a partial cavity of the main machine of the centrifugal compressor and a dry gas sealing area cavity;
prior to inflating the seal gas area with seal gas corresponding to the double-ended dry gas seal, the method further comprises:
detecting whether a main machine part, a double-end-face dry gas seal, corresponding pipe fittings and matched detection equipment of the centrifugal compressor are correctly installed or not;
if the installation is incorrect, corresponding adjustment is carried out;
the step of filling the sealing gas area with the sealing gas corresponding to the double-end-face dry gas seal specifically comprises the following steps:
and if the installation is correct, filling the sealing gas area with sealing gas corresponding to the double-end-face dry gas seal.
8. The utility model provides a sealing performance detection device of centrifugal compressor bi-polar face dry gas seal which characterized in that includes:
the cleaning unit is used for cleaning impurities in the cavity of the centrifugal compressor;
the installation unit is used for installing a main machine part of the centrifugal compressor, installing a double-end-face dry gas seal on a corresponding position of the centrifugal compressor by using a special dry gas seal tool, and installing corresponding pipe fittings and matched detection equipment, wherein the double-end-face dry gas seal comprises a seal gas area and an isolation gas area;
the inflation unit is used for inflating the sealing gas corresponding to the double-end-face dry gas seal into the sealing gas area and enabling the pressure of the sealing gas to meet a preset test pressure standard;
the inflation unit is also used for inflating the isolation gas corresponding to the double-end-face dry gas seal into the isolation gas area, and enabling the pressure of the isolation gas and the pressure of the seal gas to meet the pressure standard when the double-end-face dry gas seal of the centrifugal compressor normally operates;
and the monitoring unit is used for determining the sealing performance of the double-end-face dry gas seal of the centrifugal compressor by respectively monitoring the pipeline pressure and the air input of the sealing gas area and the isolating gas area and combining the air displacement of the double-end-face dry gas seal.
9. A storage device having a computer program stored thereon, wherein the computer program, when executed by a processor, implements the method of detecting sealing performance of a centrifugal compressor double-ended dry gas seal of any one of claims 1 to 7.
10. An apparatus for testing the sealing performance of a double-end dry gas seal of a centrifugal compressor, comprising a storage device, a processor and a computer program stored on the storage device and executable on the processor, wherein the processor implements the method for testing the sealing performance of a double-end dry gas seal of a centrifugal compressor according to any one of claims 1 to 7 when executing the computer program.
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| CN201810833314.8A CN109139526B (en) | 2018-07-26 | 2018-07-26 | Method and device for detecting sealing performance of dry gas seal on two end faces of centrifugal compressor |
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| CN103558016A (en) * | 2013-10-25 | 2014-02-05 | 中国航空动力机械研究所 | Testing rack and all-condition sealing testing device |
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| US20020092343A1 (en) * | 2001-01-16 | 2002-07-18 | Josef Sedy | Static gas seal pressure test fixture |
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| JP2007078630A (en) * | 2005-09-16 | 2007-03-29 | Sanden Corp | Fluid machine leak inspecting method, device used for the method, and fluid machine manufactured via the method |
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Address after: 110869 No. 16 A Development Road, Shenyang Economic and Technological Development Zone, Liaoning Province Patentee after: Shenyang Blower Works Group Corp. Address before: 110869 No. 16 A Development Road, Shenyang Economic and Technological Development Zone, Liaoning Province Patentee before: SHENYANG BLOWER WORKS Group Corp. |
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Application publication date: 20190104 Assignee: SHENYANG BLOWER GROUP GEAR COMPRESSOR CO.,LTD. Assignor: Shenyang Blower Works Group Corp. Contract record no.: X2023210000172 Denomination of invention: Testing Method and Device for Sealing Performance of Double Face Dry Gas Seals in Centrifugal Compressors Granted publication date: 20200331 License type: Common License Record date: 20231103 |
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