CN217059555U - Nuclear power plant radioactive waste gas hydrogen and oxygen content sampling and measuring device - Google Patents
Nuclear power plant radioactive waste gas hydrogen and oxygen content sampling and measuring device Download PDFInfo
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- CN217059555U CN217059555U CN202220015593.9U CN202220015593U CN217059555U CN 217059555 U CN217059555 U CN 217059555U CN 202220015593 U CN202220015593 U CN 202220015593U CN 217059555 U CN217059555 U CN 217059555U
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Abstract
The utility model belongs to the technical field of the nuclear power station exhaust-gas treatment, concretely relates to radioactive waste gas hydrogen of nuclear power plant and oxygen content sample measurement device, sample entry connect the three-way valve, and the aspiration pump is connected all the way to the three-way valve, and another way is connected and is decompressed the governing valve, and two the tunnel are gathered and are connected to the manometer on the spot, and the filter is connected to the manometer on the spot, and the filter low reaches divide three routes: the first path is connected with a bypass needle valve, and the bypass needle valve is connected to a stop valve; the second path is connected with a needle valve at the inlet of a hydrogen meter, the needle valve at the inlet of the hydrogen meter is connected with the hydrogen meter, the hydrogen meter is connected with a pressure sensor of the hydrogen meter, the pressure sensor of the hydrogen meter is connected with a flow meter of the hydrogen meter, and the flow meter of the hydrogen meter is connected with a stop valve; the third path is connected with an oxygen meter inlet needle valve, the oxygen meter inlet needle valve is connected with an oxygen meter, the oxygen meter is connected with an oxygen meter pressure sensor, the oxygen meter pressure sensor is connected with an oxygen meter flowmeter, and the oxygen meter flowmeter is connected with a stop valve; the stop valve is connected with the sample discharge port. Can reduce the emission in the radioactive gas sampling process and improve the safety.
Description
Technical Field
The utility model belongs to the technical field of the nuclear power station exhaust-gas treatment, concretely relates to radioactive waste gas hydrogen of nuclear power plant and oxygen content sample measuring device, it is special for M310 and hualong a pressurized water reactor nuclear power station exhaust-gas treatment system.
Background
The existing Fuqing nuclear power island chemical laboratory adopts the modes of manual sampling and gas chromatography analysis for measuring the content of hydrogen and oxygen in system gases such as waste gas treatment and the like, and has the following problems.
1. The oxygen content of radioactive waste gas of the receiving box (OTS parameters required by operation technical specifications) can be measured by chemical personnel every week, the initial operation pressure of the new receiving box after decay and evacuation is about 0.02MPa, and in order to prevent radioactive alarm, the waste gas is discharged and swept to a waste gas system head box. The head box pressure is 0.02-0.25Mpa, the pressure of the receiving tank body is less than the pressure of the scavenging head box, and the representativeness of the sample of the measuring tank body can not be ensured.
2. The gas chromatography is adopted for measurement, the time consumption such as stable startup is long (more than 30 min), during the up-down period of the unit, frequent tank body purging and tank body switching consume a large amount of manpower and material resources, and the detection range of an instrument is limited.
3. Personnel have an internal exposure risk: because the radioactive waste gas of the nuclear power plant is analyzed, the risk of internal irradiation caused by mistaken inhalation of radioactive gas leakage personnel exists in the process of analyzing the sample.
Disclosure of Invention
An object of the utility model is to provide a nuclear power plant's radioactive waste gas hydrogen and oxygen content sample measurement device, for each hydrogen in the improvement waste gas, oxygen gas content analysis's accuracy, optimize measuring mode, reduce the emission among the radioactive gas sampling process, improve the security, guarantee staff's safety is reformed transform at current "three wastes gas" collection device, increases power device's portable radioactive hydrogen, oxygen gas content on-line measuring device.
In order to achieve the above purpose, the utility model adopts the technical proposal that:
the utility model provides a nuclear power plant's radioactive waste gas hydrogen and oxygen content sampling measurement device, sample entry linkage three-way valve, three-way valve connect the aspiration pump all the way, and another way connects the decompression governing valve, and two ways are gathered and are connected to manometer on the spot, and manometer on the spot connects the filter, and the filter low reaches divide the three routes: the first path is connected with a bypass needle valve, and the bypass needle valve is connected to a stop valve; the second path is connected with a needle valve at the inlet of the hydrogen meter, the needle valve at the inlet of the hydrogen meter is connected with the hydrogen meter, the hydrogen meter is connected with a pressure sensor of the hydrogen meter, the pressure sensor of the hydrogen meter is connected with a flow meter of the hydrogen meter, and the flow meter of the hydrogen meter is connected with a stop valve; the third path is connected with an inlet needle valve of the oxygen meter, the inlet needle valve of the oxygen meter is connected with the oxygen meter, the oxygen meter is connected with an oxygen meter pressure sensor, the oxygen meter pressure sensor is connected with an oxygen meter flowmeter, and the oxygen meter flowmeter is connected with the stop valve; the stop valve is connected with the sample discharge port.
The hydrogen gauge pressure sensor is connected with the touch screen.
The oxygen meter pressure sensor is connected with the touch screen.
The hydrogen meter is connected with the touch screen.
The oxygen meter is connected with the touch screen.
The air pump is an explosion-proof air pump.
The local pressure gauge is a disc type sensing pressure gauge.
The filter pore size is 0.025 um.
The hydrogen meter flowmeter is a float flowmeter.
The oxygen meter flowmeter is a float flowmeter.
The utility model discloses the beneficial effect who gains does:
the gas to be analyzed enters an online measuring device by utilizing the pressure difference in a process system, the gas to be measured respectively enters a hydrogen meter and an oxygen meter flow cell in the device for analysis after being filtered by a filter, and the analyzed sample gas is discharged to a gas recovery tank (a waste gas system head box) of a power plant. And a steam-water separation device is arranged in the analysis device, so that the pipeline condensed water is prevented from influencing the measurement of the hydrogen and oxygen contents. And when the pressure in the gas tank to be analyzed is too low, starting an explosion-proof air pump to pump the pressure of the tank body to a sampling analysis system. Because the sampling line pressure when starting explosion-proof aspiration pump and bleeding can be great, unnecessary gas is discharged to power plant's gas recovery jar from the bypass.
The power device is arranged in the online measuring device for the content of hydrogen and oxygen in the gas, so that certain gas taking flow can be generated through the operation of the power pump when the pressure of the waste gas receiving tank is insufficient, and the sampling requirement is met. The device realizes the on-line measurement of the content of hydrogen and oxygen in the radioactive gas, shortens the measurement time, shortens each data to 1 min/measurement data from half an hour of manual analysis, and improves the analysis efficiency. The sampling and measuring process is completely carried out in a sealing device, and the radioactive internal irradiation risk of personnel is reduced. The instrument is provided with manual sampling points, and the accuracy of the online meter can be ensured by regular comparison.
Drawings
FIG. 1 is a schematic diagram of a device for sampling and measuring the contents of hydrogen and oxygen in radioactive waste gas of a nuclear power plant;
in the figure: 101-hydrogen meter flow meter; 102-an oxygen meter flow meter; 201-in situ pressure gauge; 202-hydrogen gauge pressure sensor; 203-oxygen gauge pressure sensor; 3-hydrogen meter; 4-oxygen meter; 501-by-pass needle valve; 502-hydrogen meter inlet needle valve; 503-oxygen meter inlet needle valve; 601, decompression regulating valve; 602-a stop valve; 7, a filter; 8-a suction pump; 9-a touch screen; 10-a three-way valve; 11-sample drain; 12-sample inlet.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings and specific embodiments.
The gas inlet of the mobile radioactive gas hydrogen and oxygen content online measuring device is connected with a waste gas tank to be measured through a pipeline, the gas outlet is connected to a waste gas head box, a waste gas receiving tank is opened during measurement and is connected to a valve of the measuring device, meanwhile, the opening device is connected to a valve of the waste gas head box, and gas to be measured is discharged to the waste gas head box through the measuring device through pressure difference. And if the pressure difference is insufficient, starting the power device to perform pumping. And the gas to be measured is dehydrated after passing through the steam-water separation device, enters a filter, is filtered to remove relevant impurities, then respectively enters a hydrogen and oxygen content measuring pipeline, passes through the measuring device and is discharged to a waste gas head box through a connecting pipeline. The hydrogen and oxygen content values are read from the display screen of the device, and the main components of the device are a portable hydrogen and oxygen meter, a sampling pump, and a special pipeline and an interface which are connected with the system. At present, the content of hydrogen and oxygen is relatively mature by using a portable instrument measuring technology, and partial chemical instrument manufacturers in China can design and produce complete equipment according to requirements.
As shown in fig. 1, the sample inlet 12 is connected to a three-way valve 10, one way of the three-way valve 10 is connected to the air pump 8, the other way is connected in parallel to a pressure reducing regulating valve 601, the two ways are connected to an on-site pressure gauge 201 in a summary manner, the on-site pressure gauge 201 is connected to a filter 7, and the downstream of the filter 7 is divided into three ways: the first path is connected with a bypass needle valve 501, and the bypass needle valve 501 is connected to a stop valve 602; the second path is connected with a hydrogen meter inlet needle valve 502, the hydrogen meter inlet needle valve 502 is connected with a hydrogen meter 3, the hydrogen meter 3 is connected with a hydrogen meter pressure sensor 202, the hydrogen meter pressure sensor 202 is connected with a hydrogen meter flowmeter 101, and the hydrogen meter flowmeter 101 is connected with a stop valve 602; the third path is connected with an oxygen meter inlet needle valve 503, the oxygen meter inlet needle valve 503 is connected with an oxygen meter 4, the oxygen meter 4 is connected with an oxygen meter pressure sensor 203, the oxygen meter pressure sensor 203 is connected with an oxygen meter flowmeter 102, and the oxygen meter flowmeter 102 is connected with a stop valve 602; the stop valve 602 is connected to the sample discharge port 11; the hydrogen meter pressure sensor 202, the oxygen meter pressure sensor 203, the hydrogen meter 3 and the oxygen meter 4 are all connected with the touch screen 9.
In the figure 1, the connection modes are all stainless steel pipe welding, and the pressure bearing is more than or equal to 1.0 Mpa. Both sample discharge port 11 and sample inlet port 12 are 1/4 "MNPT × 3/8" MNPT (304SS) female. The air pump 8 is an explosion-proof air pump, the pressure bearing is more than or equal to 1.0MPa, and the power supply is as follows: AC 100-240V, 50 Hz. The in-situ pressure gauge 201 is a disc type pressure sensing gauge (range 0.01-2.5 mpa). The pore size of the filter 7 is 0.025 um. The touch screen 9 is an integrated touch screen, an operating system is arranged in the integrated touch screen, and a motor starting unit is arranged in the integrated touch screen. The three-way valve 10 has a one-way function. The hydrogen meter flowmeter 101 and the oxygen meter flowmeter 102 are float flowmeters and display the flow rate of 0-400 mL/min. The hydrogen meter 3 has the precision of +/-0.3% (0.1-10% H2), +/-1% (10-100% H2) and the pressure bearing of less than or equal to 1.0 MPa; measurement range: 0.1-100%, response time less than 1min, and detection limit of 0.1%. The accuracy of oxygen meter 4 is +/-0.1%, the pressure bearing is less than or equal to 1.0MPa, and the measurement range is as follows: 0-21%, the response time of a fluorescence method ppm level oxygen probe is less than 1min, and the detection limit is 0.1%.
Claims (10)
1. The utility model provides a radioactive waste gas hydrogen of nuclear power plant and oxygen content sampling measurement device which characterized in that: sample entry connects the three-way valve, and the three-way valve is connected the aspiration pump all the way, and another way is connected the decompression governing valve, and two ways are gathered and are connected to manometer on the spot, and manometer on the spot connects the filter, and the filter low reaches divide three routes: the first path is connected with a bypass needle valve, and the bypass needle valve is connected to a stop valve; the second path is connected with a needle valve at the inlet of the hydrogen meter, the needle valve at the inlet of the hydrogen meter is connected with the hydrogen meter, the hydrogen meter is connected with a pressure sensor of the hydrogen meter, the pressure sensor of the hydrogen meter is connected with a flow meter of the hydrogen meter, and the flow meter of the hydrogen meter is connected with a stop valve; the third path is connected with an oxygen meter inlet needle valve, the oxygen meter inlet needle valve is connected with an oxygen meter, the oxygen meter is connected with an oxygen meter pressure sensor, the oxygen meter pressure sensor is connected with an oxygen meter flowmeter, and the oxygen meter flowmeter is connected with a stop valve; the stop valve is connected with the sample discharge port.
2. The nuclear power plant radioactive exhaust gas hydrogen and oxygen content sampling and measuring device according to claim 1, characterized in that: the hydrogen meter pressure sensor is connected with the touch screen.
3. The nuclear power plant radioactive exhaust gas hydrogen and oxygen content sampling and measuring device according to claim 1, characterized in that: the oxygen meter pressure sensor is connected with the touch screen.
4. The nuclear power plant radioactive exhaust gas hydrogen and oxygen content sampling and measuring device according to claim 1, characterized in that: the hydrogen meter is connected with the touch screen.
5. The nuclear power plant radioactive exhaust gas hydrogen and oxygen content sampling and measuring device according to claim 1, characterized in that: the oxygen meter is connected with the touch screen.
6. The nuclear power plant radioactive exhaust gas hydrogen and oxygen content sampling and measuring device according to claim 1, characterized in that: the air pump is an explosion-proof air pump.
7. The nuclear power plant radioactive exhaust gas hydrogen and oxygen content sampling and measuring device according to claim 1, characterized in that: the local pressure gauge is a disc type sensing pressure gauge.
8. The nuclear power plant radioactive exhaust gas hydrogen and oxygen content sampling and measuring device according to claim 1, characterized in that: the pore size of the filter is 0.025 um.
9. The nuclear power plant radioactive exhaust gas hydrogen and oxygen content sampling and measuring device according to claim 1, characterized in that: the hydrogen meter flowmeter is a float flowmeter.
10. The nuclear power plant radioactive exhaust gas hydrogen and oxygen content sampling and measuring device according to claim 1, characterized in that: the oxygen meter flowmeter is a float flowmeter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220015593.9U CN217059555U (en) | 2022-01-06 | 2022-01-06 | Nuclear power plant radioactive waste gas hydrogen and oxygen content sampling and measuring device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220015593.9U CN217059555U (en) | 2022-01-06 | 2022-01-06 | Nuclear power plant radioactive waste gas hydrogen and oxygen content sampling and measuring device |
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| Publication Number | Publication Date |
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| CN217059555U true CN217059555U (en) | 2022-07-26 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202220015593.9U Active CN217059555U (en) | 2022-01-06 | 2022-01-06 | Nuclear power plant radioactive waste gas hydrogen and oxygen content sampling and measuring device |
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| Country | Link |
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| CN (1) | CN217059555U (en) |
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- 2022-01-06 CN CN202220015593.9U patent/CN217059555U/en active Active
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