CN101008591B - Discontinuous gas analysis method and equipment thereof - Google Patents
Discontinuous gas analysis method and equipment thereof Download PDFInfo
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- CN101008591B CN101008591B CN2007100671044A CN200710067104A CN101008591B CN 101008591 B CN101008591 B CN 101008591B CN 2007100671044 A CN2007100671044 A CN 2007100671044A CN 200710067104 A CN200710067104 A CN 200710067104A CN 101008591 B CN101008591 B CN 101008591B
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Abstract
This invention discloses one interval gas analysis method, which comprises the following steps: a, closing second valve fixed on first one and opening first one connected to the high pressure device with the gas inside filled with first and second valves capacitor as sample; b, closing first valve and opening second valve with first storage through second valve downstream; c, releasing the samplegas through second valve; d, analyzing released sample gas to get sample parameters. This invention also discloses one device to exert above method.
Description
Technical field
The present invention relates to gas analysis, more particularly, relate to a kind of discontinuous analysis method for gases and device.
Background technology
In chemical production field, usually need to analyze the concentration of various process gas, such as in urea synthesis, the ratio of interior ammonia of synthetic tower and carbon dioxide is kept within the specific limits, need to analyze ammonia and concentration of carbon dioxide for this reason; Above-mentioned course of reaction is normally carried out under hyperbaric environment, and as 150 more than the atmospheric pressure, this just needs the method and apparatus of gas concentration in a kind of energy measurement hyperbaric environment.
In order to measure the gas concentration under the hyperbaric environment, use sampling back off-line analysis method usually, concrete grammar is: connect a valve on high-tension unit, when needs are taken a sample, an air container is connected a side of valve, and keeps sealing; Open valve, the tested gas in the high-tension unit flows into air container; Close described valve afterwards, off-line uses various technology to remove to analyze tested gas again, can adopt technology such as chemical method, optical method, biochemical process to remove to analyze the content that obtains each composition in the sample gas.But this way needs the hand sampling gases at high pressure, or even toxic gas, and potential safety hazard is big, the cost of labor height; Since be sampling back off-line analysis, need be longer with the time, measurement lags behind serious, and the reference value of measurement result is little; Sample frequency is low simultaneously, and the gas concentration that can not monitor effectively in the tested high-tension unit changes.
For solve in the technique scheme can not on-line analysis deficiency, a kind of on-line analysis method is arranged at present: a reduction valve is installed on tested high-tension unit, utilize this reduction valve that the high pressure in the high-tension unit is reduced to normal pressure, then atmosphere gas is sent into gas analysis instrument analysis.But because the sample airshed that gas analysis instrument needs is less, and there is a decompression of vast scale, the ventilation aperture of reduction valve must be transferred to very little under this working method, when the gas in the tested high-tension unit contains the chip of the dust of larger particles or device materials, easily stop up described reduction valve; In addition, crystallization can take place in measured process gas in decompression process in some devices, stop up described reduction valve, during for example the vapor phase ammonia carbon ratio in apparatus for urea synthesis is measured, ammonia, carbon dioxide temperature in the process that is reduced pressure by vast scale in the high pressure synthetic tower significantly reduce, and stop up reduction valve thereby generate carbamic acid ammonia crystalline solid.Obviously, this kind method maintenance workload is big, can not satisfy the needs of gas analysis in the high-tension unit well.
Summary of the invention
In order to solve above-mentioned deficiency of the prior art, the invention provides a kind of energy is automatic, work online discontinuous analysis method for gases and device.
For achieving the above object, the present invention is achieved by following technical proposals:
A kind of discontinuous analysis method for gases said method comprising the steps of:
A. close the second level valve that is installed in first order valve downstream, open the first order valve that is connected on the tested high-tension unit; Gas in the described tested high-tension unit charges into first order air container between the described first order and the second level valve as sample gas;
B. close described first order valve, open second level valve, the sample gas in the described first order air container is by flow direction valve downstream, the described second level;
C. to the voltage stabilizing of reducing pressure by the sample gas behind the valve of the second level;
D. analyze the sample gas after the decompression voltage stabilizing, obtain the parameter of sample gas.
Between described second level valve and the decompression stable-pressure device second level air container is installed also.
The described first order and second level valve are autocontrol valves.
Described tested high-tension unit is a urea synthesizer.
Insulation of described sample gas or heating.
For realizing said method, the invention allows for a kind of like this discontinuous gas analyzing apparatus, comprise sampling apparatus, be installed in the analytical instrument in sampling apparatus downstream; Described sampling apparatus comprises first order valve, first order air container, second level valve and the decompression stable-pressure device that is installed in successively on the breather line; Described first order valve is connected with tested high-tension unit.
Second level air container is also installed in the downstream of described second level valve.
The described first order and second level valve are autocontrol valves, and described analytical equipment also comprises the control device that is connected with second level valve with the first order.
Described tested high-tension unit is a urea synthesizer.
Attemperator or heating arrangement are installed on the described sampling apparatus.
According to technical scheme of the present invention, because the gases at high pressure online, that the tested high-tension unit of interruption sampling automatically is interior also charge in the first order air container, cutting off described high-tension unit then is connected with gas circuit between the first order air container, high-pressure gas flow in the first order air container downstream, again to the voltage stabilizing of reducing pressure of the gas by second level valve, thereby can automatically, non-maintainingly analyze the sample gas after the decompression voltage stabilizing, obtain the concentration of sample gas.
Useful technique effect of the present invention is: 1) can automatically move, maintenance is little, the safety coefficient height; 2) on-line sampling, the sample frequency height, measurement is little retardation time, has monitored the gas concentration in the high-tension unit effectively, can instruct production better.
Description of drawings
Fig. 1 is the structural representation of a kind of discontinuous gas analyzing apparatus of the present invention;
Fig. 2 is the structural representation of another kind of discontinuous gas analyzing apparatus of the present invention.
Embodiment
Below in conjunction with drawings and Examples, the present invention is described in further detail.
Embodiment 1:
As shown in Figure 1, a kind of discontinuous gas analyzing apparatus is applied in the analysis of urea synthesizer mesohigh mixed gas, and the mol ratio that obtains ammonia and carbon dioxide is ammonia carbon ratio (N/C), thereby removes to optimize urea production process, economizes in raw materials, and reduces production costs.Described analytical equipment comprises discontinuous gas sampling assembly and gas analysis instrument 8.
Described sampling apparatus comprises breather line, control device 9 and is installed in first order valve 2, first order air container 3, the second level valve 4 on the described breather line and the stable-pressure device that reduces pressure successively.Described first order valve 2 and second level valve 4 are autocontrol valves, and present embodiment adopts electrical ball valve, and described first order valve 2 is installed on the urea synthesizer 1, and the pressure of the mixed gas in the described urea synthesizer 1 is 15MPa, also are 150 atmospheric pressure; Described control device 9 is connected with second level valve 4 with described first order valve 2, is used for controlling automatically the open and close of described first order valve 2, second level valve 4.Described first order air container 3 is to make with high pressure resistant corrosion-resistant material, and the volume of first order air container 3 is 0.1L, and described decompression stable-pressure device adopts two needle- valves 6,7.
Heating arrangement (or attemperator) is installed on the described sampling apparatus, is made the sample gas in the sampling apparatus keep certain temperature, prevent that the ammonia carbon reaction in the mixed gas from generating described each valves of material obstruction such as carbamic acid ammonia, and then influence is measured.
Described gas analysis instrument 8 is installed in the downstream of described decompression stable-pressure device, is used to analyze the concentration of gas after the decompression voltage stabilizing.Present embodiment adopts the semi-conductor laser absorption spectrum gas analyzing instrument.
Present embodiment has also disclosed a kind of discontinuous analysis method for gases, also is the course of work of above-mentioned analytical equipment, said method comprising the steps of:
A. the second level valve 4 that is installed in first order valve 2 downstreams is closed in described control device 9 controls, opens the first order valve 2 that is connected on the urea synthesizer 1; High pressure mixed gas in the described urea synthesizer 1 charges into first order air container 3 between described first order valve 2 and the second level valve 4 as sample gas;
B. described first order valve 2 is closed in 9 controls of described control device, and opens second level valve 4, and the sample gas in the described first order air container 3 flows to the downstream after by described second level valve 4;
C. the sample gas that flows through from described second level valve 4 passes through described decompression stable-pressure device decompression voltage stabilizing, has further reduced the pressure of mixed gas, makes the pressure of mixed gas be reduced to normal pressure;
D. use the mixed gas after described gas analysis instrument 8 is analyzed the decompression voltage stabilizing, thereby obtain ammonia in the mixed gas, concentration of carbon dioxide, and then obtain the vapor phase ammonia carbon ratio.
In the said process, the sample gas in the sampling apparatus is heated (or insulation).
Embodiment 2:
As shown in Figure 2, a kind of discontinuous gas analyzing apparatus as different from Example 1, is also installed second level air container 5 between described second level valve 4 and decompression stable-pressure device, and volume is 1L.
Present embodiment has also disclosed a kind of discontinuous analysis method for gases, also is the course of work of above-mentioned analytical equipment, said method comprising the steps of:
A. detailed process is identical with step a among the embodiment 1;
B. described first order valve 2 is closed in described control device 9 controls, and open second level valve 4, sample gas in the described first order air container 3 charges in the described second level air container 5 after by described second level valve 4, and the expansion of volume has reduced the pressure of sample gas, and the sample air-flow downstream afterwards;
C. from the described decompression stable-pressure device decompression of the sample gas process voltage stabilizing of described second level air container 5 outflows, further reduced the pressure of mixed gas, made the pressure of mixed gas be reduced to normal pressure;
D. detailed process is identical with steps d among the embodiment 1.
In the said process, the sample gas in the sampling apparatus is heated (or insulation).
It is pointed out that above-mentioned embodiment should not be construed as limiting the scope of the invention.Use the semi-conductor laser absorption spectrum analytical technology among the embodiment, can also adopt analysis technology such as galvanochemistry certainly.Key of the present invention is, the gases at high pressure online, that the tested high-tension unit of interruption sampling automatically is interior also charge in the first order air container, cutting off described high-tension unit then is connected with gas circuit between the first order air container, high-pressure gas flow in the first order air container downstream, again to the voltage stabilizing of reducing pressure of the gas by second level valve, thereby can automatically, non-maintainingly analyze the sample gas after the decompression voltage stabilizing, obtain the concentration of sample gas.Under the situation that does not break away from spirit of the present invention, any type of change that the present invention is made all should fall within protection scope of the present invention.
Claims (10)
1. discontinuous analysis method for gases said method comprising the steps of:
A. close the second level valve that is installed in first order valve downstream, open the first order valve that is connected on the tested high-tension unit; Gas in the described tested high-tension unit charges into first order air container between described first and second grades of valves as sample gas;
B. close described first order valve, open second level valve, the sample gas in the described first order air container is by flow direction valve downstream, the described second level;
C. to the voltage stabilizing of reducing pressure by the sample gas behind the valve of the second level;
D. analyze the sample gas after the decompression voltage stabilizing, obtain the parameter of sample gas.
2. analytical approach according to claim 1 is characterized in that: second level air container is also installed in the downstream of described second level valve.
3. analytical approach according to claim 1 is characterized in that: the described first order and second level valve are autocontrol valves.
4. according to claim 1 or 2 or 3 described analytical approachs, it is characterized in that: described tested high-tension unit is a urea synthesizer.
5. analytical approach according to claim 4 is characterized in that: insulation of described sample gas or heating.
6. discontinuous gas analyzing apparatus comprises sampling apparatus, is installed in the analytical instrument in sampling apparatus downstream; It is characterized in that: described sampling apparatus comprises first order valve, first order air container, second level valve and the decompression stable-pressure device that is installed in successively on the breather line; Described first order valve is connected with tested high-tension unit.
7. analytical equipment according to claim 6 is characterized in that: between described second level valve and the decompression stable-pressure device second level air container is installed also.
8. analytical equipment according to claim 6 is characterized in that: the described first order and second level valve are autocontrol valves, and described analytical equipment also comprises the control device that is connected with second level valve with the first order.
9. according to claim 6 or 7 or 8 described analytical equipments, it is characterized in that: described tested high-tension unit is a urea synthesizer.
10. analytical equipment according to claim 9 is characterized in that: attemperator or heating arrangement are installed on the described sampling apparatus.
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| CN2007100671044A CN101008591B (en) | 2007-01-29 | 2007-01-29 | Discontinuous gas analysis method and equipment thereof |
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| CN2007100671044A CN101008591B (en) | 2007-01-29 | 2007-01-29 | Discontinuous gas analysis method and equipment thereof |
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| CN102042945B (en) * | 2010-11-03 | 2012-02-01 | 北京航空航天大学 | Method for measuring oil mist concentration of closed gear box |
| CN107957359B (en) * | 2017-12-29 | 2020-09-22 | 中国科学院过程工程研究所 | Method and device for sampling gas in high-pressure reaction process |
| CN112730747B (en) * | 2020-12-25 | 2021-08-17 | 深圳市安室智能有限公司 | Gas detection method, system, gas analyzer and storage medium |
| CN113638724B (en) * | 2021-10-18 | 2022-03-08 | 山东德仕石油装备有限公司 | Injection equipment for carbon dioxide flooding |
| CN114019101B (en) * | 2021-10-29 | 2023-12-08 | 中船(邯郸)派瑞特种气体股份有限公司 | High-pressure gas trace moisture analysis device and analysis method |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2152017C1 (en) * | 1998-12-17 | 2000-06-27 | Конструкторское Бюро Общего Машиностроения | Device to take samples of high-pressure gases |
| CN2416502Y (en) * | 2000-03-05 | 2001-01-24 | 李长玉 | High pressure gas sampling device |
| CN201000406Y (en) * | 2007-01-29 | 2008-01-02 | 王健 | Interrupted gas analyzer |
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- 2007-01-29 CN CN2007100671044A patent/CN101008591B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2152017C1 (en) * | 1998-12-17 | 2000-06-27 | Конструкторское Бюро Общего Машиностроения | Device to take samples of high-pressure gases |
| CN2416502Y (en) * | 2000-03-05 | 2001-01-24 | 李长玉 | High pressure gas sampling device |
| CN201000406Y (en) * | 2007-01-29 | 2008-01-02 | 王健 | Interrupted gas analyzer |
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Owner name: JUGUANG SCIENCE AND TECHNOLOGY (HANGZHOU) CO., LTD Free format text: FORMER OWNER: WANG JIAN Effective date: 20090605 |
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Effective date of registration: 20090605 Address after: Hangzhou City, Zhejiang province Binjiang District Binhu road 760 post encoding: 310052 Applicant after: Focused Photonics (Hangzhou) Inc. Address before: Hangzhou City, Zhejiang Province, Binjiang District Lake Road 1180 No. 3 Building 2 floor post encoding: 310052 Applicant before: Wang Jian |
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