CN109283297B - Independent calibration sampling system for hydrogen online analysis - Google Patents
Independent calibration sampling system for hydrogen online analysis Download PDFInfo
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- CN109283297B CN109283297B CN201811308688.4A CN201811308688A CN109283297B CN 109283297 B CN109283297 B CN 109283297B CN 201811308688 A CN201811308688 A CN 201811308688A CN 109283297 B CN109283297 B CN 109283297B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/0004—Gaseous mixtures, e.g. polluted air
- G01N33/0009—General constructional details of gas analysers, e.g. portable test equipment
- G01N33/0027—General constructional details of gas analysers, e.g. portable test equipment concerning the detector
- G01N33/0036—General constructional details of gas analysers, e.g. portable test equipment concerning the detector specially adapted to detect a particular component
- G01N33/005—H2
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N35/00—Automatic analysis not limited to methods or materials provided for in any single one of groups G01N1/00 - G01N33/00; Handling materials therefor
- G01N35/10—Devices for transferring samples or any liquids to, in, or from, the analysis apparatus, e.g. suction devices, injection devices
- G01N35/1009—Characterised by arrangements for controlling the aspiration or dispense of liquids
- G01N35/1011—Control of the position or alignment of the transfer device
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Abstract
The hydrogen online analysis independent calibration sampling system comprises a sampling gas inlet pipeline, a calibration gas inlet pipeline, a purity measurement calibration switching valve, an oxygen measurement calibration switching valve, a pressure reducer, a humidity sensing unit, a purity sensing unit, an oxygen sensing unit, a humidity sensing unit protection valve, a purity sensing unit protection valve, an oxygen sensing unit protection valve, an emptying pipeline, a first tee joint, a second tee joint, a third tee joint, a first adjustable flowmeter, a second adjustable flowmeter, an automatic oil discharge filter group and a sampling pipeline; the invention is a multifunctional sampling system integrating gas sampling, calibration, analysis (or detection) and sensing unit protection. The invention can well meet the field measurement requirement of each sensing unit, and ensures that each sensing unit can work stably for a long time.
Description
Technical Field
The invention belongs to the technical field of hydrogen online detection, and particularly relates to an independent calibration sampling system for hydrogen online analysis of generator hydrogen quality.
Background
At present, a hydrogen cooling technology is mostly adopted in a domestic generator set, and standard documents such as the first part of heating power and machinery of the safety regulations of GB26164.1-2010 electric industry and the standard documents such as the safety technical regulations of GB 4962-2008 hydrogen use are stipulated for online detection of the purity, humidity and oxygen content of hydrogen in a generator hydrogen system, and are mandatory requirements.
In order for a generator set to operate safely, reliably, economically and stably, it is necessary to improve the accuracy of measurement of the hydrogen quality (e.g., purity, humidity and oxygen content) within the set. Therefore, on-site high requirements are put on the maintenance of the on-line real-time monitoring sensing unit for the purity, humidity and oxygen content of the hydrogen, and periodic and irregular calibration and comparison are necessary because drift and aging problems determined by the characteristics of the sensor are unavoidable.
Disclosure of Invention
The invention aims to solve the defects in the prior art and provides an independent calibration sampling system for hydrogen on-line analysis of the hydrogen quality of a generator.
In order to solve the technical problems, the invention adopts the following technical scheme: the hydrogen online analysis independent calibration sampling system comprises a sampling gas inlet pipeline, a calibration gas inlet pipeline, a purity measurement calibration switching valve, an oxygen measurement calibration switching valve, a pressure reducer, a humidity sensing unit, a purity sensing unit, an oxygen sensing unit, a humidity sensing unit protection valve, a purity sensing unit protection valve, an oxygen sensing unit protection valve, an emptying pipeline, a first tee joint, a second tee joint, a third tee joint, a first adjustable flowmeter, a second adjustable flowmeter, an automatic oil discharge filter group and a sampling pipeline;
The humidity sensing unit protection valve, the purity sensing unit protection valve and the oxygen sensing unit protection valve have the same structure and are provided with an A interface, a B interface, a C interface and a D interface, wherein the A interface is an air inlet, and an A-B, C-D channel in the air inlet can be switched into an A-D, B-C channel through a rotary valve shaft;
The air inlet end of the sampling gas inlet pipeline is connected with the generator hydrogen main pipeline, the air outlet of the sampling gas inlet pipeline is connected with the air inlet of the automatic oil discharge filter group, the air outlet of the automatic oil discharge filter group is connected to a first interface of the first tee joint, a second interface of the first tee joint is connected with the air inlet of the sampling pipeline, a third interface of the first tee joint is connected with an A interface of the humidity sensing unit protection valve, the humidity sensing unit is connected between a B interface and a C interface of the humidity sensing unit protection valve in series, and a D interface of the humidity sensing unit protection valve is connected with the air inlet of the pressure reducer; the gas outlet of the pressure reducer is connected with a first interface of a second tee joint, the gas is divided into two paths by the second tee joint, and a second interface and a third interface of the second tee joint are respectively connected with the first interface of the purity measurement calibration switching valve and the first interface of the oxygen measurement calibration switching valve;
The air inlet of the calibration gas inlet pipeline is used for being connected with an external standard gas source, and the air outlet of the calibration gas inlet pipeline is connected with the first interface of the third tee joint; dividing the gas into two paths through a third tee joint, wherein a second interface and a third interface of the third tee joint are respectively connected with a second interface of the purity measurement calibration switching valve and a second interface of the oxygen measurement calibration switching valve;
The third interface of the purity measurement calibration switching valve is connected with the air inlet of the first adjustable flowmeter, the air outlet of the first adjustable flowmeter is connected with the interface A of the purity sensing unit protection valve 5B, the purity sensing unit is connected between the interface B and the interface C of the purity sensing unit protection valve in series, and the interface D of the purity sensing unit protection valve is connected with the emptying pipeline;
The third interface of the oxygen measurement calibration switching valve is connected with the air inlet of the second adjustable flowmeter, the air outlet of the second adjustable flowmeter is connected with the A port of the oxygen sensing unit protection valve, the oxygen sensing unit is connected between the B interface and the C interface of the oxygen sensing unit protection valve in series, and the D interface of the oxygen sensing unit protection valve 5C is connected with the emptying pipeline through a fourth tee joint.
The sampling pipe is provided with a sampling valve, and the gas outlet of the sampling pipe is a sampling port.
Still including the mounting bracket that is arranged in each part in the fixed mounting system, the mounting bracket is provided with the mounting hole that is used for fixed mounting bracket.
By adopting the technical scheme, the humidity sensing unit protection valve, the purity sensing unit protection valve and the oxygen sensing unit protection valve are in a measurement state when the inside of the humidity sensing unit protection valve, the purity sensing unit protection valve and the oxygen sensing unit protection valve is in an A-B, C-D communication state, the inside of the humidity sensing unit protection valve, the purity sensing unit protection valve and the oxygen sensing unit protection valve is in a protected state when the inside of the humidity sensing unit protection valve, the purity sensing unit protection valve and the oxygen sensing unit protection valve are in an A-D, B-C communication state, the sensing units are isolated from an air path, and the sensing units can be detached for maintenance and the like.
The invention is a multifunctional sampling system integrating gas sampling, calibration, analysis (or detection) and sensing unit protection.
During normal operation, gas sampled from the main hydrogen pipeline of the generator sequentially flows through a sampling gas inlet pipeline, an automatic oil discharge filter group, an interface A of a humidity sensing unit protection valve, a humidity sensing unit, an interface D of a humidity sensing unit protection valve 5A and a pressure reducer, and is divided into two paths through a second three-way pipeline, one path sequentially enters a purity measurement calibration switching valve, a first adjustable flowmeter and an interface A of a purity sensing unit protection valve, and finally enters a purity sensing unit to measure the purity of hydrogen; the other path sequentially enters an oxygen measurement calibration switching valve, a second adjustable flowmeter and an A interface of an oxygen sensing unit protection valve, and finally enters an oxygen sensing unit to measure the oxygen content in the hydrogen; and after measurement, the gas is respectively converged into an emptying pipeline from the gas outlet D of the purity sensing unit protection valve and the gas outlet D of the oxygen sensing unit protection valve.
The purity measurement calibration switching valve and the oxygen measurement calibration switching valve are used to switch the sampled sampling gas and the calibration gas. When calibrating a certain sensing unit in the purity sensing unit and the oxygen sensing unit, rotating the corresponding measurement purity measurement calibration switching valve or the oxygen measurement calibration switching valve to a calibration state, connecting a calibration gas inlet pipeline, allowing standard gas to enter from a gas inlet of the calibration gas inlet pipeline, sequentially flowing through the purity measurement calibration switching valve or the oxygen measurement calibration switching valve, the first adjustable flowmeter or the second adjustable flowmeter, the purity sensing unit protection valve or the oxygen sensing unit protection valve, and then respectively entering the inside of the purity sensing unit and the oxygen sensing unit for calibrating the sensing unit, wherein the humidity sensing unit is still in a monitoring state for sampling gas.
When needed, the sampling port is externally connected with a standard (humidity, purity and oxygen) instrument, and the sampling valve is opened, so that the sampled gas can be detected, and the sampled gas can be compared with the detection data of the humidity sensing unit, the purity sensing unit and the oxygen sensing unit in the invention, so that the reliability and the accuracy of the detection data are judged.
In summary, the invention has the following beneficial effects:
1. The invention can well meet the field measurement requirement of each sensing unit, and ensures that each sensing unit can work stably for a long time.
2. The automatic oil discharge filter group is arranged in the gas circuit, so that the automatic oil discharge filter group can automatically discharge sewage, prevent oil pollution of the sensing units, ensure the service life of each sensing unit in the hydrogen quality system, reduce maintenance quantity and reduce maintenance cost.
3. The invention provides a calibration gas inlet pipeline, which is convenient for the independent calibration of the purity and oxygen content sensing unit;
4. When gas which is harmful to the sensing unit enters the system, such as carbon dioxide gas in the hydrogen replacement process, the invention can isolate the sensing unit from the system and protect the sensing unit from being damaged; the sensor unit can also prevent gas leakage during disassembly and maintenance.
5. The invention provides the sampling valve and the sampling port, which are convenient for the access standard instrument to compare with the on-line monitored data and judge the reliability and the accuracy of the detected data.
Drawings
Fig. 1 is a schematic structural view of the present invention.
Detailed Description
As shown in fig. 1, the hydrogen online analysis independent calibration sampling system of the present invention comprises a sampling gas inlet pipeline 1, a calibration gas inlet pipeline 2, a purity measurement calibration switching valve 3A, an oxygen measurement calibration switching valve 3B, a pressure reducer 4, a humidity sensing unit 6, a purity sensing unit 7, an oxygen sensing unit 8, a humidity sensing unit protection valve 5A, a purity sensing unit protection valve 5B, an oxygen sensing unit protection valve 5C, an evacuation pipeline 9, a first tee 12, a second tee 17, a third tee 16, a first adjustable flowmeter 13A, a second adjustable flowmeter 13B, an automatic oil drain filter group 14 and a sampling pipeline 18;
The humidity sensing unit protection valve 5A, the purity sensing unit protection valve 5B and the oxygen sensing unit protection valve 5C have the same structure and are provided with an A interface, a B interface, a C interface and a D interface, wherein the A interface is an air inlet, and an A-B, C-D channel in the A interface can be switched into an A-D, B-C channel through a rotary valve shaft;
The air inlet end of the sampling gas inlet pipeline 1 is connected with a generator hydrogen main pipeline, the air outlet of the sampling gas inlet pipeline 1 is connected with the air inlet of the automatic oil drain filter group 14, the air outlet of the automatic oil drain filter group 14 is connected to a first interface of the first tee joint 12, a second interface of the first tee joint 12 is connected with the air inlet of the sampling pipeline 18, a third interface of the first tee joint 12 is connected with an A interface of the humidity sensing unit protection valve 5A, the humidity sensing unit 6 is connected between a B interface and a C interface of the humidity sensing unit protection valve 5A in series, and a D interface of the humidity sensing unit protection valve 5A is connected with the air inlet of the pressure reducer 4; the gas outlet of the pressure reducer 4 is connected with a first interface of a second tee joint 17, the gas is divided into two paths through the second tee joint 17, and a second interface and a third interface of the second tee joint 17 are respectively connected with a first interface of a purity measurement calibration switching valve 3A and a first interface of an oxygen measurement calibration switching valve 3B;
The air inlet of the calibration gas inlet pipeline 2 is used for being connected with an external standard gas source, and the air outlet of the calibration gas inlet pipeline 2 is connected with a first interface of the third tee joint 16; dividing the gas into two paths through a third tee joint 16, wherein a second interface and a third interface of the third tee joint 16 are respectively connected with a second interface of the purity measurement calibration switching valve 3A and a second interface of the oxygen measurement calibration switching valve 3B;
The third interface of the purity measurement calibration switching valve 3A is connected with the air inlet of the first adjustable flowmeter 13A, the air outlet of the first adjustable flowmeter 13A is connected with the interface A of the purity sensing unit protection valve 5B, the purity sensing unit 7 is connected in series between the interface B and the interface C of the purity sensing unit protection valve 5B, and the interface D of the purity sensing unit protection valve 5B is connected with the emptying pipeline 9;
The third interface of the oxygen measurement calibration switching valve 3B is connected with the air inlet of the second adjustable flowmeter 13B, the air outlet of the second adjustable flowmeter 13B is connected with the A port of the oxygen sensing unit protection valve 5C, the oxygen sensing unit 8 is connected between the B interface and the C interface of the oxygen sensing unit protection valve 5C in series, and the D interface of the oxygen sensing unit protection valve 5C is connected with the emptying pipeline 9 through the fourth tee joint 19.
The sampling pipeline 18 is provided with a sampling valve 11, and the air outlet of the sampling pipeline 18 is a sampling port 10.
The invention also includes a mounting bracket 15 for securing the various components of the mounting system, the mounting bracket 15 being provided with mounting holes for securing the mounting bracket 15.
In the invention, three sensing units are in a measurement state when the inside of the humidity sensing unit protection valve 5A, the purity sensing unit protection valve 5B and the oxygen sensing unit protection valve 5C is in an A-B, C-D communication state, and are in a protected state when the inside of the sensing unit protection valve is in an A-D, B-C communication state, and the sensing units are isolated from an air path, so that the sensing units can be detached for maintenance and the like.
During normal operation, gas sampled from a main hydrogen pipeline of the generator sequentially flows through a sampling gas inlet pipeline 1, an automatic oil discharge filter group 14, an A interface of a humidity sensing unit protection valve 5A, a humidity sensing unit 6, a D interface of the humidity sensing unit protection valve 5A and a pressure reducer 4, is divided into two paths through a second tee joint 17, one path sequentially enters a purity measurement calibration switching valve 3A, a first adjustable flowmeter 13A and an A interface of the purity sensing unit protection valve 5B, and finally enters a purity sensing unit 7 for hydrogen purity measurement; the other path sequentially enters an interface A of an oxygen measurement calibration switching valve 3B, a second adjustable flowmeter 13B and an oxygen sensing unit protection valve 5C, and finally enters an oxygen sensing unit 8 to measure the oxygen content in the hydrogen; after measurement, the gas is respectively led into the emptying pipeline 9 from the gas outlet D of the purity sensing unit protection valve 5B and the gas outlet D of the oxygen sensing unit protection valve 5C.
The purity measurement calibration switching valve 3A and the oxygen measurement calibration switching valve 3B are used to switch the sampled sampling gas and the calibration gas. When calibrating a certain sensing unit in the purity sensing unit 7 and the oxygen sensing unit 8, rotating the corresponding measurement purity measurement calibration switching valve 3A or the oxygen measurement calibration switching valve 3B to a calibration state, connecting the calibration gas inlet pipeline 2, allowing standard gas to enter from the gas inlet of the calibration gas inlet pipeline 2, sequentially flowing through the purity measurement calibration switching valve 3A or the oxygen measurement calibration switching valve 3B, the first adjustable flowmeter 13A or the second adjustable flowmeter 13B, the purity sensing unit protection valve 5B or the oxygen sensing unit protection valve 5C, and then respectively entering the sensing units in the purity sensing unit 7 and the oxygen sensing unit 8 for calibration, wherein the humidity sensing unit 6 is still in a monitoring state for sampling gas.
The sampling pipeline 18 is provided with a sampling valve 11, and the air outlet of the sampling pipeline 18 is a sampling port 10.
When needed, the sampling port 10 is externally connected with a standard (humidity, purity and oxygen) instrument, and the sampling valve 11 is opened to detect the sampled gas, so that the sampled gas can be compared with the detection data of the humidity sensing unit 6, the purity sensing unit 7 and the oxygen sensing unit 8 in the invention, and the reliability and the accuracy of the detection data are judged.
The present embodiment is not limited in any way by the shape, material, structure, etc. of the present invention, and any simple modification, equivalent variation and modification made to the above embodiments according to the technical substance of the present invention are all included in the scope of protection of the technical solution of the present invention.
Claims (1)
1. The hydrogen online analysis independent calibration sampling system is characterized in that: the device comprises a sampling gas inlet pipeline, a calibration gas inlet pipeline, a purity measurement calibration switching valve, an oxygen measurement calibration switching valve, a pressure reducer, a humidity sensing unit, a purity sensing unit, an oxygen sensing unit, a humidity sensing unit protection valve, a purity sensing unit protection valve, an oxygen sensing unit protection valve, an emptying pipeline, a first tee joint, a second tee joint, a third tee joint, a first adjustable flowmeter, a second adjustable flowmeter, an automatic oil discharge filter group and a sampling pipeline;
The humidity sensing unit protection valve, the purity sensing unit protection valve and the oxygen sensing unit protection valve have the same structure and are provided with an A interface, a B interface, a C interface and a D interface, wherein the A interface is an air inlet, and an A-B, C-D channel in the air inlet can be switched into an A-D, B-C channel through a rotary valve shaft;
The air inlet end of the sampling gas inlet pipeline is connected with the generator hydrogen main pipeline, the air outlet of the sampling gas inlet pipeline is connected with the air inlet of the automatic oil discharge filter group, the air outlet of the automatic oil discharge filter group is connected to a first interface of the first tee joint, a second interface of the first tee joint is connected with the air inlet of the sampling pipeline, a third interface of the first tee joint is connected with an A interface of the humidity sensing unit protection valve, the humidity sensing unit is connected between a B interface and a C interface of the humidity sensing unit protection valve in series, and a D interface of the humidity sensing unit protection valve is connected with the air inlet of the pressure reducer; the gas outlet of the pressure reducer is connected with a first interface of a second tee joint, the gas is divided into two paths by the second tee joint, and a second interface and a third interface of the second tee joint are respectively connected with the first interface of the purity measurement calibration switching valve and the first interface of the oxygen measurement calibration switching valve;
The air inlet of the calibration gas inlet pipeline is used for being connected with an external standard gas source, and the air outlet of the calibration gas inlet pipeline is connected with the first interface of the third tee joint; dividing the gas into two paths through a third tee joint, wherein a second interface and a third interface of the third tee joint are respectively connected with a second interface of the purity measurement calibration switching valve and a second interface of the oxygen measurement calibration switching valve;
The third interface of the purity measurement calibration switching valve is connected with the air inlet of the first adjustable flowmeter, the air outlet of the first adjustable flowmeter is connected with the interface A of the purity sensing unit protection valve (5B), the purity sensing unit is connected between the interface B and the interface C of the purity sensing unit protection valve in series, and the interface D of the purity sensing unit protection valve is connected with the emptying pipeline;
The third interface of the oxygen measurement calibration switching valve is connected with the air inlet of the second adjustable flowmeter, the air outlet of the second adjustable flowmeter is connected with the A port of the oxygen sensing unit protection valve, the oxygen sensing unit is connected in series between the B interface and the C interface of the oxygen sensing unit protection valve, and the D interface of the oxygen sensing unit protection valve (5C) is connected with the emptying pipeline through a fourth tee joint;
a sampling valve is arranged on the sampling pipe, and an air outlet of the sampling pipe is a sampling port;
Still including the mounting bracket that is arranged in each part in the fixed mounting system, the mounting bracket is provided with the mounting hole that is used for fixed mounting bracket.
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| CN201811308688.4A CN109283297B (en) | 2018-11-05 | 2018-11-05 | Independent calibration sampling system for hydrogen online analysis |
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| CN110174444A (en) * | 2019-06-12 | 2019-08-27 | 贵州电网有限责任公司 | A kind of cooling water conductivity table mounting structure of deicing device |
| CN111408198B (en) * | 2020-03-30 | 2024-12-10 | 南京科朗分析仪器有限公司 | Integrated filter flow distribution module and method of use thereof |
| CN116593669A (en) * | 2023-02-07 | 2023-08-15 | 肥东深燃天然气有限公司 | Gas content analysis system with calibration gas circuit and control method |
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