CN115497648A - Method and system for reducing gas sampling waste gas emission of high-temperature gas cooled reactor nuclear power plant - Google Patents
Method and system for reducing gas sampling waste gas emission of high-temperature gas cooled reactor nuclear power plant Download PDFInfo
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- CN115497648A CN115497648A CN202211193519.7A CN202211193519A CN115497648A CN 115497648 A CN115497648 A CN 115497648A CN 202211193519 A CN202211193519 A CN 202211193519A CN 115497648 A CN115497648 A CN 115497648A
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Abstract
The invention discloses a method for reducing gas sampling waste gas emission of a high-temperature gas cooled reactor nuclear power plant, which comprises the following steps: s1, establishing a multi-stage pressure reduction sampling pipeline system, and establishing a gas sample return pipeline between a 7MPa pipeline segment and a process pipeline in the sampling pipeline system; s2, accelerating the gas sample flow velocity in the return pipeline, and being used for accelerating the gas sample flow velocity in a 7MPa pipeline section in a sampling pipeline system and shortening the circulation time of the gas sample in the 7MPa pipeline section; s3, carrying out flow rate measurement or calculation evaluation on the gas sample flow rates in a 7MPa pipeline section, a 0.25MPa pipeline section and a 0.1MPa pipeline section of the sampling pipeline system, and obtaining sampling set time according to the flow rate measurement evaluation result; and S4, carrying out gas sample sampling operation, and opening and closing each valve group on the sampling pipeline system and the return pipeline system according to sampling set time. The invention can greatly reduce the time for the gas sample to reach the analysis instrument from the sampling point, and reduces the waste gas amount discharged by the system during gas sampling from the aspect of shortening the discharge time.
Description
Technical Field
The invention relates to the technical field of gas sampling of high-temperature gas cooled reactors, in particular to a method and a system for reducing gas sampling waste gas emission of a high-temperature gas cooled reactor nuclear power plant.
Background
At present, the sampling and analysis of helium impurities of domestic high-temperature gas cooled reactor nuclear power plants are realized through a gas sampling and analyzing system. The gas sample pressure of the sampling point is up to 7MPa, and the gas analysis instrument needs the inlet pressure to be normal pressure, so the gas sample of the sampling point needs to be reduced to 0.25MPa through a pressure reducing valve, and then is further reduced to the normal pressure (0.1 MPa) through a flow controller, namely the sampling pipeline needs to be formed by sequentially connecting a 7MPa pipeline segment, a 0.25MPa pipeline segment and a normal pressure pipeline segment. The time for the gas sample to flow from the sampling point to the analysis instrument is longer at least more than 10 minutes, all high-purity helium samples need to be discharged from an outlet of the analysis instrument in the period, a large amount of waste gas can be discharged, meanwhile, the gas sample at the outlet of the analysis instrument cannot be recovered because the gas analysis instrument does not bear pressure, and the helium carries radioactive substances when passing through a high-temperature gas cooled reactor, and is required to be filtered and discharged in the discharging process, so that the radioactive treatment cost is increased.
In the existing high-temperature gas cooled reactor power station, most sampling pipelines and process pipelines are installed and cannot be replaced easily to shorten the length of the sampling pipeline, so that the sampling time is shortened, and the aim of reducing gas emission is fulfilled.
Disclosure of Invention
The present invention is directed to solving, at least to some extent, one of the technical problems in the related art.
In order to achieve the purpose, the invention provides a method for reducing gas sampling exhaust emission of a high-temperature gas cooled reactor nuclear power plant, which comprises the following steps:
s1, selecting a gas sampling point on a process pipeline, establishing a multi-section pressure reduction sampling pipeline system, and establishing a gas sample return pipeline between a 7MPa pipeline segment and the process pipeline in the sampling pipeline system;
s2, accelerating the gas sample flow velocity in the return pipeline, and being used for accelerating the gas sample flow velocity in a 7MPa pipeline section in a sampling pipeline system and shortening the circulation time of the gas sample in the 7MPa pipeline section;
s3, carrying out flow rate measurement or calculation and evaluation on the gas sample flow rates in a 7MPa pipeline section, a 0.25MPa pipeline section and a 0.1MPa pipeline section of the sampling pipeline system, and calculating sampling time according to the flow rate measurement and evaluation result to obtain sampling set time;
and S4, carrying out gas sample sampling operation, and opening and closing valve groups on the sampling pipeline system and the return pipeline system according to sampling set time so as to accurately control the sampling time.
On one hand, the backflow pipeline is additionally arranged, and the backflow speed of the gas sample in the backflow pipeline is controlled in an accelerating mode, so that the flowing speed of the gas sample in the 7MPa pipeline is improved, the time of the gas sample from a sampling point to an analysis instrument can be greatly reduced, on the other hand, the sampling time can be further reduced by controlling the sampling valve more accurately, and further, on the premise of not influencing the gas sampling requirement, the waste gas amount discharged by a system during gas sampling is reduced in the aspect of shortening the discharge time.
Optionally, in S1, an entry point of the return pipeline system is selected from an entry point of a pressure reducing valve disposed between the 7MPa pipeline segment and the 0.25MPa pipeline segment in the sampling pipeline system, and a return point of the return pipeline system is selected from a downstream position of the process pipeline corresponding to the sampling point, so as to provide a natural pressure head for gas sample return.
Further, in S3, the calculation of the sampling time includes the steps of:
a1, carrying out flow detection and flow velocity calculation on the flow of a 7MPa pipeline segment, and estimating the flow time of a gas sample in the 7MPa pipeline segment by combining the length setting of the 7MPa pipeline segment;
a2, carrying out flow detection and flow velocity calculation on the flow of the 0.1MPa pipeline segment, and estimating the flow time of the gas sample in the 0.1MPa pipeline segment by combining the length setting of the 0.1MPa pipeline segment;
a3, carrying out flow detection and flow velocity calculation on the flow of the 0.25MPa pipeline segment, and estimating the flow time of the gas sample in the 0.25MPa pipeline segment by combining the length setting of the 0.25MPa pipeline segment;
and A4, accumulating the gas sample circulation time in each pipeline section obtained in the steps S31 to S32 to obtain the total gas sample circulation time, giving a margin coefficient, and obtaining sampling set time according to the margin coefficient multiplied by the total gas sample circulation time.
Further, in S3, the calculation of the sampling time includes the steps of:
b1, carrying out flow detection and flow velocity calculation on the flow of the 7MPa pipeline segment, and estimating the flow time of the gas sample in the 7MPa pipeline segment by combining the length setting of the 7MPa pipeline segment;
b2, carrying out flow detection and flow velocity calculation on the flow of the 0.1MPa pipeline segment, and estimating the flow time of the gas sample in the 0.1MPa pipeline segment by combining the length setting of the 0.1MPa pipeline segment;
b3, calculating the flow velocity according to the flow of the 0.1MPa pipeline segment and V 0.25MPa ＝V 0.1MPa Calculating to obtain the gas sample flow velocity in the 0.25MPa pipeline segment, and estimating the gas sample flow time in the 0.25MPa pipeline segment by combining the length setting of the 0.25MPa pipeline segment;
and B4, accumulating the gas sample circulation time in each pipeline section obtained in the S31 to the S32 to obtain the total gas sample circulation time, giving a margin coefficient, and obtaining sampling set time according to the margin coefficient multiplied by the total gas sample circulation time.
Furthermore, under specific working conditions, multiple value taking tests are carried out on the margin coefficient according to actual conditions, and a smaller value is selected from the multiple value taking tests which are accurately collected as the value of the margin coefficient at the position of the corresponding sampling point.
And further, carrying out controllable system isolation treatment on a position, close to the sampling point, on a 7MPa pipeline segment of the sampling pipeline system, and isolating the sampling pipeline system from the process system pipeline.
Furthermore, controllable system isolation processing is performed on the return pipeline system near the return point, so as to isolate the return pipeline system from the process system pipeline.
A system for reducing gas sampling waste gas emission in a high-temperature gas cooled reactor nuclear power plant comprises a process pipeline, a sampling pipeline system and a return pipeline system;
the sampling pipeline system comprises a 7MPa pipeline section, a 0.25MPa pipeline section and a 0.1MPa pipeline section which are sequentially communicated, wherein the 7MPa pipeline section is communicated with a gas sample sampling point on the process pipeline, a pressure reducing valve is arranged at the connecting position of the 7MPa pipeline section and the 0.25MPa pipeline section, flow controllers are arranged at the connecting positions of the 0.25MPa pipeline section and the 0.1MPa pipeline section, and the free end of the 0.1MPa pipeline section is connected with a gas analyzer;
the return pipeline system comprises a return pipeline arranged between the 7MPa pipeline section and the process pipeline, one end of the return pipeline is communicated with the inlet of the corresponding pressure reducing valve of the 7MPa pipeline section, the other end of the return pipeline is communicated with the return point of the process pipeline, and the return pipeline is provided with a gas flow velocity adjusting piece for regulating and controlling the gas sample return velocity.
Furthermore, the sampling pipeline system also comprises a sampling controller arranged on the pipeline section of 0.25MPa and a flowmeter arranged on the pipeline section of 7 MPa.
Furthermore, isolation valves are arranged on the return pipeline and the 7MPa pipeline section, the isolation valve on the return pipeline is arranged between the gas flow velocity regulating part and a return point of the process pipeline, and the isolation valve on the 7MPa pipeline section is arranged between the flowmeter and a sampling point on the process pipeline.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The foregoing and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a schematic diagram of the steps of a method for reducing the emission of gas sampling exhaust gas from a high temperature gas cooled reactor nuclear power plant according to the present invention;
fig. 2 is a detailed step diagram of S3 of an embodiment of a method for reducing exhaust emission of gas sampling in a high temperature gas cooled reactor nuclear power plant according to the present invention;
FIG. 3 is a detailed step diagram of S3 of another embodiment of a method for reducing exhaust emission of gas sampling from a high temperature gas cooled reactor nuclear power plant according to the present invention;
FIG. 4 is a schematic flow chart of a method for accurately controlling sampling time according to another embodiment of a method for reducing gas sampling exhaust emission in a high temperature gas cooled reactor nuclear power plant according to the invention;
FIG. 5 is a schematic structural diagram of a system for reducing the emission of sampled exhaust gas from a high temperature gas cooled reactor nuclear power plant, according to the method for reducing the emission of sampled exhaust gas from a high temperature gas cooled reactor nuclear power plant of the present invention;
fig. 6 is a schematic diagram showing a comparison between the prior and subsequent structures of a system for reducing exhaust emission of gas sampling in a high temperature gas cooled reactor nuclear power plant according to the present invention, which aims to show the communication position of a return pipeline system at a pipeline segment of 7 MPa.
Description of reference numerals:
1. a sampling pipe system; 2. a return line system; 3. a pressure reducing valve; 4. a sampling controller; 5. a flow controller; 6. a gas flow rate regulating member; 7. an isolation valve; 8. a flow meter.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
The invention provides a method for reducing gas sampling exhaust emission in a high-temperature gas cooled reactor nuclear power plant, which is described in detail with reference to fig. 1 to 4.
A method for reducing gas sampling exhaust emission in a high temperature gas cooled reactor nuclear power plant comprises the following steps:
s1, selecting a gas sampling point on a process pipeline, establishing a multi-section pressure reduction sampling pipeline system 1, and establishing a gas sample return pipeline between a 7MPa pipeline segment and the process pipeline in the sampling pipeline system 1;
s2, accelerating the gas sample flow velocity in the return pipeline, and being used for accelerating the gas sample flow velocity in a 7MPa pipeline section in the sampling pipeline system 1 and shortening the circulation time of the gas sample in the 7MPa pipeline section;
s3, carrying out flow rate measurement or calculation and evaluation on the gas sample flow rates in the 7MPa pipeline section, the 0.25MPa pipeline section and the 0.1MPa pipeline section of the sampling pipeline system 1, and calculating sampling time according to the flow rate measurement and evaluation result to obtain sampling set time;
and S4, carrying out gas sample sampling operation, and opening and closing valve groups on the sampling pipeline system 1 and the return pipeline system 2 according to sampling set time so as to accurately control the sampling time.
On one hand, the backflow pipeline is additionally arranged, and the backflow speed of the gas sample in the backflow pipeline is controlled in an accelerating mode, so that the flowing speed of the gas sample in the 7MPa pipeline is improved, the time of the gas sample from a sampling point to an analysis instrument can be greatly reduced, on the other hand, the sampling time can be further reduced by controlling the sampling valve more accurately, and further, on the premise of not influencing the gas sampling requirement, the waste gas amount discharged by a system during gas sampling is reduced in the aspect of shortening the discharge time.
In S1, when the return pipeline is established, it is necessary to integrally accelerate the flow time of oxygen flowing from the process pipeline to the pressure reducing valve 3 through the 7MPa pipeline segment, so that the entry point of the return pipeline system 2 is selected at the entrance of the pressure reducing valve 3 arranged between the 7MPa pipeline segment and the 0.25MPa pipeline segment in the sampling pipeline system 1, and the return point of the return pipeline system 2 is selected at the downstream position of the process pipeline corresponding to the sampling point, so as to provide a natural pressure head for gas sample return. Under the action of a natural pressure head, the gas sample in the 7MPa pipeline segment can accelerate circulation, so that the flow speed of the gas sample in the 7MPa pipeline segment is improved, the flowing time of the gas sample in the 7MPa pipeline segment is reduced, and the purpose of shortening the sampling time is achieved.
In some embodiments, when detecting the flow in each pipeline segment of the sampling pipeline system 1 at different pressures, the flow meter 8 or the flow controller 5 may be used to detect or control the flow in each pipeline segment at different pressures, and when using the measuring instrument to measure the gas sample flow rate in the 7MPa pipeline segment, the 0.25MPa pipeline segment and the 0.1MPa pipeline segment of the sampling pipeline system 1, the existing pipeline segments of the sampling pipeline system 1 need to be modified at multiple places to set the flow measuring element or the flow control element, and at this time, when performing the step S3, the calculation of the sampling time includes the following steps:
a1, carrying out flow detection and flow velocity calculation on the flow of a 7MPa pipeline segment, and estimating the flow time of a gas sample in the 7MPa pipeline segment by combining the length setting of the 7MPa pipeline segment;
a2, carrying out flow detection and flow velocity calculation on the flow of the 0.1MPa pipeline segment, and estimating the flow time of the gas sample in the 0.1MPa pipeline segment by combining the length setting of the 0.1MPa pipeline segment;
a3, carrying out flow detection and flow velocity calculation on the flow of the 0.25MPa pipeline segment, and estimating the flow time of the gas sample in the 0.25MPa pipeline segment by combining the length setting of the 0.25MPa pipeline segment;
and A4, accumulating the gas sample circulation time in each pipeline section obtained in the steps S31 to S32 to obtain the total gas sample circulation time, giving a margin coefficient, and obtaining sampling set time according to the margin coefficient multiplied by the total gas sample circulation time.
The flow detection elements arranged on the 7MPa pipeline section, the 0.25MPa pipeline section and the 0.1MPa pipeline section can be flow sensors, flowmeters and the like, and the flow detection elements are directly arranged on the pipelines of the pipeline sections according to the scheme of transforming the flow detection elements on the pipeline sections with different pressures, so that the structural schematic drawing is not shown in the drawing of the specification for transforming the scheme of the embodiment.
In other embodiments, considering that the existing sampling pipeline system 1 is provided with the flow controller 5 on the 0.1MPa pipeline segment for controlling the flow flowing to the gas analyzer, so that the flow in the 0.1MPa pipeline segment is controllable and known, and no flow detecting element or flow controlling element is provided on the 7MPa pipeline segment and the 0.25MPa pipeline segment, in order to reduce the modification of the original system, avoid the risk of gas leakage caused by multiple pipeline modifications, and reduce the investment of manpower and material resources, the flow meter 8 is provided on the 7MPa pipeline segment only for detecting the flow of the gas sample in the 7MPa pipeline segment, and the flow in the 0.25MPa pipeline segment can derive the equivalent flow of the gas sample in the 0.25MPa pipeline segment by calculating the flow of the 0.1MPa pipeline segment, that is, the flow rate of the gas sample in the 0.25MPa pipeline segment can be calculated, and therefore, in this modification manner, the calculation of the sampling time in S3 includes the following steps:
b1, carrying out flow detection and flow velocity calculation on the flow of the 7MPa pipeline segment, and estimating the flow time of the gas sample in the 7MPa pipeline segment by combining the length setting of the 7MPa pipeline segment;
b2, carrying out flow detection and flow velocity calculation on the flow of the 0.1MPa pipeline segment, and estimating the flow time of the gas sample in the 0.1MPa pipeline segment by combining the length setting of the 0.1MPa pipeline segment;
b3, performing flow velocity calculation results according to the flow of the 0.1MPa pipeline segment, calculating to obtain the flow velocity of the gas sample in the 0.25MPa pipeline segment, and estimating the flow time of the gas sample in the 0.25MPa pipeline segment by combining the length setting of the 0.25MPa pipeline segment;
and B4, accumulating the gas sample circulation time in each pipeline section obtained in the S31 to the S32 to obtain total gas sample circulation time, giving a margin coefficient, and obtaining sampling set time according to the margin coefficient multiplied by the total gas sample circulation time.
In the two modification schemes, the margin coefficient is required to be given in the step S4, multiple value taking tests are performed on the margin coefficient according to actual conditions under specific working conditions, and a smaller value is selected from the multiple value taking tests which are accurate to collect as a value of the margin coefficient at a position corresponding to a sampling point, so as to ensure that the most accurate sampling value can be obtained in the shortest time.
Furthermore, in order to prevent unnecessary interference between the sampling pipeline system 1, the return pipeline system 2 and the process system pipeline, controllable system isolation processing is performed on a 7MPa pipeline segment of the sampling pipeline system 1 close to a sampling point, so as to isolate the sampling pipeline system from the process system pipeline; and carrying out controllable system isolation treatment on the return pipeline system 2 close to a return point, wherein the controllable system isolation treatment is used for isolating the return pipeline system 2 from a process system pipeline.
In the existing sampling pipeline system 1, the gas sample flow speed at the inlet of a sampling instrument is about 56cm/min (0.1 MPa) during detection; from this it was concluded that the 7MPa pipe section gas sample flow rate was 56 ÷ (7 ÷ 0.1) =0.8cm/min; the original 7MPa pipeline length is about 10cm, so the measurement lag time brought by the length is 12.5 minutes, and after the method of the application is adopted, the gas sample can be sampled after passing through the 7MPa pipeline section and the return pipeline system 2, at the moment, the circulation length of the gas sample in the 7MPa pipeline section can be greatly shortened, and after the circulation speed of the gas sample in the return pipeline system 2 is accelerated, the flow speed of the gas sample in the 7MPa pipeline section can be driven to be accelerated, so that the gas sample can be quickly supplemented and moved to the position near the inlet of the pressure reducing valve 3 during sampling. Originally, gas appearance removes in 7MPa pipeline section and need remove 11cm and just can pass through relief pressure valve 3, and after this scheme of adoption, only need walk 1cm and can pass through relief pressure valve 3, consequently present time is original 1/10, about 11 minutes's sampling lag time has also been reduced, thereby reserve more emergency treatment time for the staff, when impurity is too much in the discovery helium of gas analysis instrument, the staff can go out 11 minutes time more and carry out emergency treatment, this can provide more reaction time for the emergency treatment of nuclear power station and be used for formulating and carry out the emergency treatment scheme, be used for carrying out more timely accurate processing to the nuclear reactor.
The invention also provides a system for reducing gas sampling exhaust emission in a high temperature gas cooled reactor nuclear power plant, which is explained in detail with reference to fig. 1.
A system for reducing gas sampling waste gas emission in a high-temperature gas cooled reactor nuclear power plant comprises a process pipeline, a sampling pipeline system 1 and a return pipeline system 2;
the sampling pipeline system 1 comprises a 7MPa pipeline section, a 0.25MPa pipeline section and a 0.1MPa pipeline section which are sequentially communicated, the 7MPa pipeline section is communicated with a gas sample sampling point on a process pipeline, a pressure reducing valve 3 is arranged at the connecting position of the 7MPa pipeline section and the 0.25MPa pipeline section, a flow controller 5 is arranged at the connecting position of the 0.25MPa pipeline section and the 0.1MPa pipeline section, and a gas analyzer is connected to the free end of the 0.1MPa pipeline section;
return line system 2, including setting up the return line between 7MPa pipeline section and process pipeline, return line one end corresponds 3 entrances of relief pressure valve with 7MPa pipeline section and communicates, and the other end sets up with the backward flow point intercommunication of process pipeline, is provided with the gas flow velocity adjusting part 6 that is used for regulating and control gas appearance backward flow speed on the return line, and in this embodiment, gas flow velocity adjusting part 6 sets up to the air pump.
In order to perform more detailed flow detection on the sampling pipeline system 1, the sampling pipeline system 1 further includes a sampling controller 4 disposed on a 0.25MPa pipeline segment and a flow meter 8 disposed on a 7MPa pipeline segment. In some embodiments, a flow meter 8 may also be provided in the 0.25MPa pipeline segment for directly sensing the flow of the gas sample within the 0.25MPa pipeline segment.
And in order to realize the isolation of the systems and avoid unnecessary interference between the systems, the isolating valves 7 are arranged on the return pipeline and the 7MPa pipeline section, the isolating valve 7 on the return pipeline is arranged between the gas flow velocity regulating part 6 and the return point of the process pipeline, and the isolating valve 7 on the 7MPa pipeline section is arranged between the flowmeter 8 and the sampling point on the process pipeline.
In the description of the specification, reference to the description of "one embodiment," "some embodiments," "an example," "a specific example," or "some examples" or the like means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Moreover, various embodiments or examples and features of various embodiments or examples described in this specification can be combined and combined by one skilled in the art without being mutually inconsistent.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless explicitly specified otherwise.
While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.
Claims (10)
1. A method for reducing gas sampling exhaust emission in a high temperature gas cooled reactor nuclear power plant is characterized by comprising the following steps:
s1, selecting a gas sampling point on a process pipeline, establishing a multi-section pressure reduction sampling pipeline system, and establishing a gas sample return pipeline between a 7MPa pipeline segment and the process pipeline in the sampling pipeline system;
s2, accelerating the gas sample flow velocity in the return pipeline, and being used for accelerating the gas sample flow velocity in a 7MPa pipeline section in a sampling pipeline system and shortening the circulation time of the gas sample in the 7MPa pipeline section;
s3, carrying out flow rate measurement or calculation and evaluation on the gas sample flow rates in a 7MPa pipeline section, a 0.25MPa pipeline section and a 0.1MPa pipeline section of the sampling pipeline system, and calculating sampling time according to the flow rate measurement and evaluation result to obtain sampling set time;
and S4, carrying out gas sample sampling operation, and opening and closing valve groups on the sampling pipeline system and the return pipeline system according to sampling set time so as to accurately control the sampling time.
2. The method as claimed in claim 1, wherein in S1, the inlet point of the return pipeline system is selected from an inlet of a pressure reducing valve arranged between a 7MPa pipeline segment and a 0.25MPa pipeline segment in the sampling pipeline system, and the return point of the return pipeline system is selected from a position downstream of the sampling point corresponding to the process pipeline, so as to provide a natural pressure head for gas sample return.
3. The method for reducing the exhaust emission of the gas sampling from the high temperature gas cooled reactor nuclear power plant as set forth in claim 1, wherein the calculation of the sampling time in S3 comprises the steps of:
a1, carrying out flow detection and flow velocity calculation on the flow of a 7MPa pipeline segment, and estimating the flow time of a gas sample in the 7MPa pipeline segment by combining the length setting of the 7MPa pipeline segment;
a2, carrying out flow detection and flow velocity calculation on the flow of the 0.1MPa pipeline segment, and estimating the flow time of the gas sample in the 0.1MPa pipeline segment by combining the length setting of the 0.1MPa pipeline segment;
a3, carrying out flow detection and flow velocity calculation on the flow of the 0.25MPa pipeline segment, and estimating the flow time of the gas sample in the 0.25MPa pipeline segment by combining the length setting of the 0.25MPa pipeline segment;
and A4, accumulating the gas sample circulation time in each pipeline section obtained in the steps S31 to S32 to obtain the total gas sample circulation time, giving a margin coefficient, and obtaining sampling set time according to the margin coefficient multiplied by the total gas sample circulation time.
4. The method for reducing the exhaust emission of the gas sampling from the high temperature gas cooled reactor nuclear power plant as set forth in claim 1, wherein the calculation of the sampling time in S3 comprises the steps of:
b1, carrying out flow detection and flow velocity calculation on the flow of the 7MPa pipeline segment, and estimating the flow time of the gas sample in the 7MPa pipeline segment by combining the length setting of the 7MPa pipeline segment;
b2, carrying out flow detection and flow velocity calculation on the flow of the 0.1MPa pipeline segment, and estimating the flow time of the gas sample in the 0.1MPa pipeline segment by combining the length setting of the 0.1MPa pipeline segment;
b3, calculating the flow velocity according to the flow of the 0.1MPa pipeline section according to V 0.25MPa ＝V 0.1MPa Calculating to obtain the gas sample flow velocity in the 0.25MPa pipeline section, and estimating the gas sample flow time in the 0.25MPa pipeline section by combining the length setting of the 0.25MPa pipeline section;
and B4, accumulating the gas sample circulation time in each pipeline section obtained in the S31 to the S32 to obtain the total gas sample circulation time, giving a margin coefficient, and obtaining sampling set time according to the margin coefficient multiplied by the total gas sample circulation time.
5. The method for reducing the gas sampling exhaust emission of the high temperature gas cooled reactor nuclear power plant according to claim 3 or 4, characterized in that the margin coefficient is subjected to a plurality of value taking tests according to actual conditions under specific working conditions, and a smaller value is selected from a plurality of accurate value taking tests as the value of the margin coefficient at the position of the corresponding sampling point.
6. The method as claimed in claim 1, wherein a controllable system isolation treatment is performed on a 7MPa pipeline segment of the sampling pipeline system near the sampling point to isolate the sampling pipeline system from the process system pipeline.
7. The method as claimed in claim 1, wherein a controllable system isolation process is performed on the return pipeline system near the return point for isolating the return pipeline system from the process system pipeline.
8. A system for reducing gas sampling waste gas emission in a high-temperature gas cooled reactor nuclear power plant is characterized by comprising a process pipeline, a sampling pipeline system and a return pipeline system;
the sampling pipeline system comprises a 7MPa pipeline section, a 0.25MPa pipeline section and a 0.1MPa pipeline section which are sequentially communicated, wherein the 7MPa pipeline section is communicated with a gas sample sampling point on the process pipeline, a pressure reducing valve is arranged at the connecting position of the 7MPa pipeline section and the 0.25MPa pipeline section, flow controllers are arranged at the connecting positions of the 0.25MPa pipeline section and the 0.1MPa pipeline section, and the free end of the 0.1MPa pipeline section is connected with a gas analyzer;
the return pipeline system comprises a return pipeline arranged between the 7MPa pipeline section and the process pipeline, one end of the return pipeline is communicated with the inlet of the corresponding pressure reducing valve of the 7MPa pipeline section, the other end of the return pipeline is communicated with the return point of the process pipeline, and the return pipeline is provided with a gas flow velocity adjusting piece for regulating and controlling the gas sample return velocity.
9. The system of claim 8, wherein the sampling pipeline system further comprises a sampling controller disposed on a 0.25MPa pipeline segment and a flow meter disposed on a 7MPa pipeline segment.
10. The system of claim 9, wherein the return line and the 7MPa line segment are each provided with an isolation valve, the isolation valve on the return line is disposed between the gas flow rate adjusting member and a return point of the process pipeline, and the isolation valve on the 7MPa line segment is disposed between the flow meter and a sampling point on the process pipeline.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117367893A (en) * | 2023-09-11 | 2024-01-09 | 华能核能技术研究院有限公司 | Offline sampling device and method for primary loop gas of high-temperature gas cooled reactor nuclear power plant |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117367893A (en) * | 2023-09-11 | 2024-01-09 | 华能核能技术研究院有限公司 | Offline sampling device and method for primary loop gas of high-temperature gas cooled reactor nuclear power plant |
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