CN101201285A - On-line leak detection method for lining of urea synthetic tower - Google Patents
On-line leak detection method for lining of urea synthetic tower Download PDFInfo
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- CN101201285A CN101201285A CNA2007100509384A CN200710050938A CN101201285A CN 101201285 A CN101201285 A CN 101201285A CN A2007100509384 A CNA2007100509384 A CN A2007100509384A CN 200710050938 A CN200710050938 A CN 200710050938A CN 101201285 A CN101201285 A CN 101201285A
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Abstract
The invention discloses an on-line leak-detecting means for the liner of a urea synthetic tower, and is characterized in that the invention comprises the following steps: 1. supporting gas with constant pressure is fed into the loose lining gap layer and the leak detection channel between the stainless steel liner and the encloser of the urea synthetic tower; 2. the supporting gas flowing out of a leakage-detection hole is admitted into a washing tank, and the supporting gas is absorbed with supporting gas cleaning solvent fed continuously; 3. the conductivity of the supporting gas cleaning solvent is measured with a measuring device, and is transmitted to the DCS Operating System, and whether the lining layer of the urea synthetic tower leaks is determined through analyzing the change trend of the preset values relative to the warning message and the detected data. The on-line leak-detecting means provided by the invention has the advantages of high response speed, high detection accuracy, high reliability and saving investment.
Description
Technical field
The present invention relates to a kind of on-line leak detection method for lining of urea synthetic tower.
Background technology
At present the nucleus equipment urea synthesizer of the main urea production process carbon dioxide stripping their of China, ammonia stripping process, water solution total cycling method, improvement C method is the lining tower, generally is made up of internal layer urea class stainless steel lining, transition bed and pressure-bearing carbon steel shell.Owing to be subjected to equipment manufacturing technology to limit (mainly being welding residual stress), in tower under the High Temperature High Pressure deep-etching reaction environment, there is the probability of leakage all the time in urea synthesizer, in case stainless steel lining leaks, the High Temperature High Pressure severe corrosive is produced medium can produce heavy corrosion to carbon steel shell, finally leads to serious accident.Whether for this reason, the carbon steel shell of urea synthesizer stainless steel lining inside and outside has all designed leak hunting aperture, monitor the synthetic tower backing layer by leak detection and leak.
The existing leak hunting technology of urea synthesizer mainly contains three kinds: 1. test solution absorption process; 2. artificial leak detection regularly; 3. nh 3-n analyser, ammonia infrared spectrum analyser etc. are based on the online leak hunting technology of electrode potential principle.Preceding two kinds of leak hunting methods are subjected to the influence of objective factors such as people or environment easily, sensitivity and reliability can not get guaranteeing, and fail to realize on-line monitoring, the discovery and the processing of leaking had tangible hysteresis phenomenon, the generation of cause the accident easily expansion and even synthetic tower explosion accident.
It is the leak hunting technology that nucleus equipment carries out online detection to the leak detection gas of carrier gas that the comparatively advanced at present online leak hunting technology of urea synthesizer has adopted with nh 3-n analyser, ammonia infrared spectrum analyser etc.Domestic have the synthetic tower of a urea plant to adopt the online leak detection system of ammonia infrared analysis, the defective of this leak hunting technology is the leaking medium response time longer, and the working pressure of gas of carrier gas does not have regulation, the safety regulation for operations that whether meets urea synthesizer is still to be tested; The synthetic tower of another urea plant adopts the gas that does not have the leak detection medium to cover the online leak hunting technology of sampling observation, and the defective of this leak hunting technology is that the total system vacuumizing causes bleed leak detection conduit and cause corrosion and form volatile mixed gas of moisture, air easily.In addition, also there are some general character drawbacks in these systems: 1. design is comparatively complicated; 2. it is not mature enough to be applied to the core instrumentation of monitoring, and reliability is still to be tested; 3. the main equipment of Cai Yonging costs an arm and a leg, and project investment is higher.
Summary of the invention
The technical problem to be solved in the present invention is the synthetic tower on-line leak detection method for lining of how supplying urea, and this method advantages of simple can overcome existing defective in the prior art.
The technical matters that proposes of the present invention is to solve like this: a kind of on-line leak detection method for lining of urea synthetic tower is provided, it is characterized in that, may further comprise the steps:
The gas of carrier gas that 1. will have a constant pressure feeds pine lining clearance layer and the ring-type leak detection conduit between stainless steel lining and housing continuously from a side of urea synthesizer or both sides;
The above-mentioned gas of carrier gas that 2. will flow out leak hunting aperture again imports in the sink and absorbs with the gas of carrier gas cleansing solution that adds continuously;
3. adopt the electric conductivity value measurement mechanism to measure the electric conductivity value of gas of carrier gas cleansing solution and be transferred to the DCS operating system of urea plant, DCS operating system is analyzed warning message and detection data variation trend by preset value, judges whether the urea synthesizer backing layer is revealed.
According to urea synthesizer lining online test method provided by the present invention, it is characterized in that, step 1. in, described gas of carrier gas is to enter pine lining clearance layer and ring-type leak detection conduit between stainless steel lining and housing by being arranged on many groups gas of carrier gas pipeline in the urea synthesizer; Step 2. in, the gas of carrier gas that flows out leak hunting aperture is to be imported into the gas of carrier gas sink by the overflow line that is arranged in the urea synthesizer.
According to urea synthesizer lining online test method provided by the present invention, it is characterized in that described gas of carrier gas pressure limit is controlled between 0.5～2.9Kpa, the best is 1.6Kpa or 1.8Kpa or 2.0Kpa.
According to urea synthesizer lining online test method provided by the present invention, it is characterized in that described gas of carrier gas is an inert gas, does not have corrosivity as nitrogen, helium etc.,, unionization not affine with water, chemical reaction do not take place with leaking medium or other satisfactory inert gas.
According to urea synthesizer lining online test method provided by the present invention, it is characterized in that the addition of described gas of carrier gas cleansing solution is controlled at 0.5～2m
3Between/the h, the best is 0.8m
3/ h or 1.0m
3/ h1.2m
3/ h.
According to urea synthesizer lining online test method provided by the present invention, it is characterized in that described gas of carrier gas cleansing solution is steam condensate or desalted water.
According to urea synthesizer lining online test method provided by the present invention, it is characterized in that described electric conductivity value measurement mechanism is conductivity meter or liquid phase ammonia-blood urea/nitrogen analyzer.
According to urea synthesizer lining online test method provided by the present invention, it is characterized in that the electric conductivity value HiAlm limit is 30～45u Ω/cm, the best is 30u Ω/cm or 35u Ω/cm or 40u Ω/cm.
The present invention has following beneficial effect: 1, realized the on-line monitoring whether the urea synthesizer backing layer leaks.Can effectively overcome the hysteresis phenomenon of traditional leak hunting method, and save manually-operated, avoid artificial or leakage that environmental factor causes stagnate inspection, omission or flase drop.2, response speed is fast, the accuracy of detection height.Adopt conductivity meter to detect the gas of carrier gas cleansing solution, its leaking medium response time is very short, and can accurately measure the micro-leakage component in the cleansing solution.Practical application shows, when full tower ammonia leakage rate only is 1.25 * 10
-4During mg/min, in 24 second time, conductivity meter just can detect the variation of component, makes leakage situation be able to timely discovery.3, reliability height.Because what main equipment adopted is the extremely low conventional conductivity meter of failure rate, thereby testing result accurately and reliably.4, reduced investment.Brief and the main equipment of technological process of the present invention is the cheaper conventional conductivity meter of price and has utilized the existing DCS operating system of urea plant, thereby reduced investment.This technology is the first Application in urea plant, has a good application prospect.
Description of drawings
Fig. 1 is a process chart provided by the present invention;
Fig. 2 is the process chart of an embodiment of the present invention.
Embodiment
The present invention is described in detail below in conjunction with accompanying drawing.
The present invention proposes a kind of by continuous feeding constant pressure gas of carrier gas and adopt conductivity meter on-line monitoring gas of carrier gas cleansing solution, the urea synthesizer lining carried out online leak detection, having adopted the conventional instrument that failure rate is extremely low, accuracy of detection is high to improve the response speed and the degree of reliability of monitoring, is a kind of online leak hunting technology of low investment.
Workflow of the present invention is: the gas of carrier gas that will have a certain pressure feeds pine lining clearance layer and the ring-type leak detection conduit between stainless steel lining and housing continuously from the urea synthesizer one or both sides, the gas of carrier gas that flows out leak hunting aperture is imported in the sink and absorbs with the steam condensate washing that adds continuously, the employing conductivity meter is measured the electric conductivity value of cleansing solution and is sent into the DCS operating system of urea plant, realize the automatic indication of Monitoring Data at this, record and warning, by analysis-by-synthesis, can judge whether the urea synthesizer backing layer leaks to warning message and detection data variation trend.Technological process of the present invention by steam condensate pipeline, gas of carrier gas pipeline, gas of carrier gas sink, conductivity meter or other liquid phase in-line analyzer, DCS operating system totally five parts form.The gas of carrier gas conveyance conduit adopts stainless steel material, stops up the extremely narrow leak detection passage of urea synthesizer to avoid producing impurity such as hammer scale.The gas of carrier gas pressure stability is controlled at 0.5～2.9Kpa, meets the safety regulation for operations of urea synthesizer, washs agent and is steam condensate (or desalted water) and add continuously and the control stabilization flow is 0.5～2m
3/ h, electric conductivity value HiAlm limit are 30～45u Ω/cm.
The present invention has utilized the existing DCS operating system of urea plant, thereby need not to set up signal processing system again.Gas of carrier gas cleansing solution detector is recommended to adopt conductivity meter, also can adopt other liquid phase in-line analyzer (as liquid phase ammonia-blood urea/nitrogen analyzer).
Be illustrated in figure 2 as a specific embodiment of the present invention: the gas of carrier gas that the online leak detection system that the urea plant synthetic tower adopts feeds is a nitrogen, and add from the synthetic tower both sides, each tower section at urea synthesizer, by the stable pressure that provides in the external world is the nitrogen of 0.3～0.6MPa, controlling its pressure through stop valve is 0.5～2.9Kpa, and flow is about 4～25m
3/ h, the leak hunting aperture through the synthetic tower both sides enter the pine lining gap and the leak detection conduit of synthetic tower simultaneously, and the leak detection tube outside drawing tower body is collected into the gas of carrier gas sink respectively, is 0.5～2m with flow in sink
3The steam condensate washing of/h absorbs the medium in the sample gas, condensed fluid after the washing is delivered to conductivity meter and is measured its electric conductivity value, and measured value sent into DCS operating system indication, record and make corresponding signal process according to HiAlm limit, the noble gas after washing is drawn emptying on the spot by the sink blow-down pipe.The leaking medium response time of native system is about 30 seconds, and online detection is reported to the police automatically and is limited to 1.25～7.5 * 10 of full tower ammonia leakage rate
-4Mg/min if the tower body lining has when leak taking place, as long as variation tendency by electric conductivity value and alerting signal can be judged situations such as leaking the character that takes place, degree apace, is convenient to operating personnel and is in time found and eliminate accident potential in the production.
The present invention also can make various alternatives, mainly be to be used for urea synthesizer, be applicable to that also all have the pressure vessel of inner core or pine lining lining structure, more than by embodiment by the accompanying drawing illustrated embodiment, be to further describing that foregoing of the present utility model is made, but this should be interpreted as that the scope of the theme that the present invention is above-mentioned only limits to described example.Do not breaking away under the above-mentioned technological thought situation of the present invention, various replacements and change according to ordinary skill knowledge and customary means are made all should comprise within the scope of the invention.
Claims (8)
1. an on-line leak detection method for lining of urea synthetic tower is characterized in that, may further comprise the steps:
The gas of carrier gas that 1. will have a constant pressure feeds pine lining clearance layer and the ring-type leak detection conduit between stainless steel lining and housing continuously from a side of urea synthesizer or both sides;
The above-mentioned gas of carrier gas that 2. will flow out leak hunting aperture again imports in the sink and absorbs with the gas of carrier gas cleansing solution that adds continuously;
3. adopt the electric conductivity value measurement mechanism to measure the electric conductivity value of gas of carrier gas cleansing solution and be transferred to the DCS operating system of urea plant, DCS operating system is analyzed warning message and detection data variation trend by preset value, judges whether the urea synthesizer backing layer is revealed.
2. urea synthesizer lining online test method according to claim 1, it is characterized in that, step 1. in, described gas of carrier gas is to enter pine lining clearance layer and ring-type leak detection conduit between stainless steel lining and housing by being arranged on many groups gas of carrier gas pipeline in the urea synthesizer; Step 2. in, the gas of carrier gas that flows out leak hunting aperture is to be imported into the gas of carrier gas sink by the overflow line that is arranged in the urea synthesizer.
3. urea synthesizer lining online test method according to claim 1 and 2 is characterized in that described gas of carrier gas pressure limit is controlled between 0.5～2.9Kpa.
4. urea synthesizer lining online test method according to claim 1 and 2 is characterized in that described gas of carrier gas is an inert gas.
5. urea synthesizer lining online test method according to claim 1 is characterized in that the addition of described gas of carrier gas cleansing solution is controlled at 0.5～2m
3Between/the h.
6. urea synthesizer lining online test method according to claim 1 or 5 is characterized in that described gas of carrier gas cleansing solution is steam condensate or desalted water.
7. urea synthesizer lining online test method according to claim 1 is characterized in that described electric conductivity value measurement mechanism is conductivity meter or liquid phase ammonia-blood urea/nitrogen analyzer.
8. urea synthesizer lining online test method according to claim 1 is characterized in that the electric conductivity value HiAlm limit is 30～45u Ω/cm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007100509384A CN101201285A (en) | 2007-12-21 | 2007-12-21 | On-line leak detection method for lining of urea synthetic tower |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007100509384A CN101201285A (en) | 2007-12-21 | 2007-12-21 | On-line leak detection method for lining of urea synthetic tower |
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|---|---|
| CN101201285A true CN101201285A (en) | 2008-06-18 |
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|---|---|---|---|
| CNA2007100509384A Pending CN101201285A (en) | 2007-12-21 | 2007-12-21 | On-line leak detection method for lining of urea synthetic tower |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102384822A (en) * | 2010-09-06 | 2012-03-21 | 贵州金赤化工有限责任公司 | Detection device for monitoring leak detection tube of urine high voltage equipment |
-
2007
- 2007-12-21 CN CNA2007100509384A patent/CN101201285A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102384822A (en) * | 2010-09-06 | 2012-03-21 | 贵州金赤化工有限责任公司 | Detection device for monitoring leak detection tube of urine high voltage equipment |
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Open date: 20080618 |