CN102586802B - Method for quickly recovering operation of electrochemical trace oxygen analyzer - Google Patents
Method for quickly recovering operation of electrochemical trace oxygen analyzer Download PDFInfo
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- CN102586802B CN102586802B CN201210061264.9A CN201210061264A CN102586802B CN 102586802 B CN102586802 B CN 102586802B CN 201210061264 A CN201210061264 A CN 201210061264A CN 102586802 B CN102586802 B CN 102586802B
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- hydrogen
- oxygen analyzer
- trace oxygen
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Abstract
The invention relates to a method for quickly recovering operation of an electrochemical trace oxygen analyzer in water electrolysis hydrogen production, which is mainly used for halt maintenance of water electrolysis hydrogen production equipment. The method comprises the following steps of: (1) connecting pipelines of the trace oxygen analyzer with a nitrogen pipeline, namely connecting the input pipeline of the trace oxygen analyzer and the output pipeline of a hydrogen sampling valve with the nitrogen pipeline through two control valves, and arranging a vent valve between the two control valves; (2) arranging a normally-open vent valve on the trace oxygen analyzer; (3) inputting nitrogen of which the oxygen content is less than 20 PPm and the pressure is 0.7 MPa, wherein the flow rate is 0.001Nm3/h; (4) closing the hydrogen sampling valve of the trace oxygen analyzer, and closing the vent valve; and (5) opening the two control valves, and making the nitrogen smoothly enter the trace oxygen analyzer. According to the method, the recovery time of the trace oxygen analyzer is shortened after a system is maintained, the recovery process is less than 0.5 hour, the time for hydrogen production operation is shortened, the work efficiency of the system is improved, and hydrogen emission is reduced.
Description
Technical field:
The present invention is mainly used in hydro-electrolytic hydrogen production device stop production to overhaul, and the electrochemistry oxygen instrument that declines of the operation that makes as early as possible to lag behind resumes operation.
Background technology
Often there is following problem in water electrolysis hydrogen producing run duration:
(1) hydrogen gas leakage.Hydrogen has special physicals: easily leak, because molecular weight is little and viscosity is low, its leaks is about 2 times of air; Easily diffusion, approximately than air diffuser fast 3.8 times.So frequently there is gas leakage event in the joint flange of water electrolysis hydrogen producing system device or pipeline or screw thread position.
(2) alkali liquor leakage.It is the KOH solution of 28～30% mass concentrations that water electrolysis hydrogen producing adopts ionogen, and electrolyzer and hydrogen manufacturing framework equipment normal operating temperature are 85～90 DEG C, and highly basic at high temperature corrodibility is very strong, causes equipment and pipeline often to corrode leakage event.
Hydrogen chemically reactive is very strong, inflammable, explosive, so take special measure to process leakage problem for ensureing after security system must be stopped transport while there is hydrogen gas leakage event.The system handling failure of often stopping transport, but production restoration is very slow afterwards, subject matter is that the electrochemistry oxygen instrument that declines recovers the uptime and lags behind.
Fig. 1 is existing hydrogen production process general flow chart.
In figure, have two hydro-electrolytic hydrogen production device 1#, 2#, every cover hydro-electrolytic hydrogen production device throughput is 100Nm
3/ h, respectively by electrolyzer, hydrogen manufacturing framework and purifying system framework.Two cover electrochemistry decline, and whether oxygen instrument to be respectively used to purifying framework outlet testing product hydrogen qualified, and these detection data are sent to PLC Controlling System.If testing product hydrogen is containing oxygen > 10ppm, the three-way control valve that system control is purified to rear portion spherical tank is " emptying " state, and hydrogen can not arrive spherical tank; If testing product hydrogen, containing oxygen≤10ppm, is " spherical tank " state to the three-way control valve of spherical tank, hydrogen is transported to spherical tank.As shown in Figure 1.
In the time of system stop production to overhaul, this micro-oxygen instrument is in air ambient, and oxygen level reaches 21.8% (218000 ppm), seriously consumes the micro-oxygen instrument probe of electrochemistry, battery life.
After hydrogen generating system resumes production, micro-oxygen instrument is common more than approximately 6～8 hours by needing containing oxygen 218000 return to≤10ppm of ppm operating mode, and it is defective emptying continuously that period P LC detects hydrogen, wastes a large amount of hydrogen, and seriously restricts rear portion hydrogen users production.
Summary of the invention
The problem that seals in micro-oxygen instrument probe, shortens its life-span in order to solve large quantity of air between turn(a)round, the invention provides in fast quick-recovery water electrolysis hydrogen producing the electrochemistry oxygen instrument method for commissioning that declines.
Technical scheme of the present invention is:
Operation steps of the present invention comprises 1, micro-oxygen instrument pipeline is connected with nitrogen pipeline, on the intake line of micro-oxygen instrument the delivery conduit of hydrogen sampling valve, is connected with nitrogen pipeline by two control valves, is provided with a vent valve between two control valves;
2, a vent valve of often opening is set on micro-oxygen instrument.
3, passing into containing oxygen < 20PPm and pressure is the nitrogen of 0.7MPa, and flow is 0.001Nm
3/ h.
4, close micro-oxygen instrument hydrogen sampling valve, close vent valve.
5, two control valves are opened, nitrogen enters micro-oxygen instrument smoothly.
When the normal hydrogen manufacturing of the present invention, two control valves are closed, and the vent valve between two control valves prevents that in open site hydrogen and nitrogen from going here and there mutually, and the sampling valve before micro-oxygen instrument is in opened condition, hydrogen can arrive micro-oxygen instrument, and the air valve that often begins to rehearse on micro-oxygen instrument can be discharged tail gas smoothly.
The present invention takes in the time of water electrolysis hydrogen producing system stop production to overhaul to the electrochemistry oxygen instrument method of logical nitrogen continuously that declines; with protection detection probe, air-isolation; avoid air to electrochemistry the having a strong impact on of oxygen instrument life-span that decline; shorten putting into operation the time of the rear micro-oxygen instrument of water electrolysis hydrogen producing maintenance, improved water electrolysis hydrogen producing operational efficiency.Meanwhile also greatly shortened the time of recovery of micro-oxygen instrument after system overhaul, recovery process is less than 0.5 hour, goes into operation and has shortened the time for hydrogen manufacturing, has improved system works efficiency, has reduced hydrogen discharge.
Brief description of the drawings
Fig. 1 is existing hydrogen production process general flow chart.
Fig. 2 is equipment structure chart of the present invention.
In figure, 1, nitrogen pipeline, 2, purifying framework, 3, micro-oxygen instrument, 4, control valve, 5, control valve, 6, vent valve, 7, the normal air valve that begins to rehearse, 8, control valve, 9, sampling valve, 10, three-way control valve, 11, spherical tank.
Embodiment
1, micro-oxygen instrument pipeline is connected with nitrogen pipeline 1, on the intake line of micro-oxygen instrument 3 delivery conduit of hydrogen sampling valve 9, is connected with nitrogen pipeline 1 by two control valves 5,8, between two control valves 5,8, be provided with a vent valve 6;
2, a vent valve of often opening 7 is set on micro-oxygen instrument 3.
3, water electrolyzer hydrogen manufacturing stops, and blind plate is blocked up in spherical tank import.
4, passing into containing oxygen < 20PPm and pressure is the nitrogen of 0.7MPa, and flow is 0.001Nm
3/ h.
5, hydrogen manufacturing framework and electrolyzer are qualified with nitrogen purging hydrogen.
6, purifying framework is with the qualified rear shut-down purge control valve 4 of nitrogen purging hydrogen.
7, close micro-oxygen instrument hydrogen sampling valve 9.
8, close vent valve 6.
9, two control valves 5,8 are opened, nitrogen enters micro-oxygen instrument smoothly, ensures that air does not enter micro-oxygen instrument probe.
Illustrate: 1, control valve 4, purifying framework 2, sampling valve 9, three-way control valve 10 and spherical tank 11 are all auxiliary facilities of hydro-electrolytic hydrogen production device.
Claims (1)
1. the electrochemistry oxygen instrument method for commissioning that declines in fast quick-recovery water electrolysis hydrogen producing, is characterized in that comprising following operation steps:
(1), micro-oxygen instrument pipeline is connected with nitrogen pipeline, on the intake line of micro-oxygen instrument the delivery conduit of hydrogen sampling valve, be connected with nitrogen pipeline by two control valves, between two control valves, be provided with a vent valve;
(2), a vent valve of often opening is set on micro-oxygen instrument;
(3), to pass into containing oxygen < 20PPm and pressure be the nitrogen of 0.7MPa, flow is 0.001Nm
3/ h;
(4), close micro-oxygen instrument hydrogen sampling valve, close vent valve;
(5), two control valves are opened, nitrogen enters micro-oxygen instrument smoothly.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210061264.9A CN102586802B (en) | 2012-03-09 | 2012-03-09 | Method for quickly recovering operation of electrochemical trace oxygen analyzer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210061264.9A CN102586802B (en) | 2012-03-09 | 2012-03-09 | Method for quickly recovering operation of electrochemical trace oxygen analyzer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102586802A CN102586802A (en) | 2012-07-18 |
| CN102586802B true CN102586802B (en) | 2014-07-30 |
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| CN201210061264.9A Active CN102586802B (en) | 2012-03-09 | 2012-03-09 | Method for quickly recovering operation of electrochemical trace oxygen analyzer |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104034770A (en) * | 2014-07-01 | 2014-09-10 | 安徽马钢自动化信息技术有限公司 | Hot standby probe of micro oxygen analyzer |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201096735Y (en) * | 2007-10-01 | 2008-08-06 | 蔡晓玲 | Water elimination device for oxygen analyzer in hydrogen |
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2012
- 2012-03-09 CN CN201210061264.9A patent/CN102586802B/en active Active
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201096735Y (en) * | 2007-10-01 | 2008-08-06 | 蔡晓玲 | Water elimination device for oxygen analyzer in hydrogen |
Non-Patent Citations (2)
| Title |
|---|
| 气体中微量氧分析测试方法综述;郑江琳;《低温与特气》;20120228;第30卷(第1期);第1-4页 * |
| 郑江琳.气体中微量氧分析测试方法综述.《低温与特气》.2012,第30卷(第1期),第1-4页. |
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| CN102586802A (en) | 2012-07-18 |
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