CN1084637A - A kind of method that detects residual oil steam cracking device fractionator bottom coke with infra-red thermal imaging instrument - Google Patents
A kind of method that detects residual oil steam cracking device fractionator bottom coke with infra-red thermal imaging instrument Download PDFInfo
- Publication number
- CN1084637A CN1084637A CN 92107770 CN92107770A CN1084637A CN 1084637 A CN1084637 A CN 1084637A CN 92107770 CN92107770 CN 92107770 CN 92107770 A CN92107770 A CN 92107770A CN 1084637 A CN1084637 A CN 1084637A
- Authority
- CN
- China
- Prior art keywords
- tower
- burnt
- fractionator
- thermal imaging
- residual oil
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Landscapes
- Investigating Or Analyzing Materials Using Thermal Means (AREA)
- Radiation Pyrometers (AREA)
Abstract
The present invention is a kind of method of utilizing infra-red thermal imaging instrument to detect residual oil steam cracking device fractionator prodelta clay Jiao.The present invention sets up a kind of method that detects the burnt situation of fractionator prodelta clay in the running status, and over one hundred production facts have proved that the accuracy rate of this method is 100%.This method invention raise implement on the sub-petrochemical corporation (complex) residual oil steam cracking device after, increased the raw material treatment capacity, prolonged the device cycle of operation, reduced the coke cleaning amount.This method is applicable to that all change the chemical plant that causes the outside wall temperature field to change owing to thermal resistance that interior leakage or internal blocking cause, as pipeline, tower, jar etc.
Description
The present invention is a kind of method of utilizing infra-red thermal imaging instrument to detect residual oil steam cracking device fractionator prodelta clay Jiao.
The residual oil steam cracking device is in service, because physics sedimentation and chemical reaction cause fractionator bottom sediments solid coke (long-pending burnt), liquid material flows out at the bottom of the obstruction tower, and very the person causes the pyrolysis furnace feeder pump to be found time, and has only the parking coke cleaning.Therefore, detect the burnt degree of tower prodelta clay in the running status effectively, in time the adjusting process parameter is conquered burnt evil, is the key of the normal operation of residual oil steam cracking device.
Fractionator prodelta clay Jiao is many technological parameters, the interactional combined reaction of operating conditions, because liquid material and coke powder mixing thermodynamics, fluid mechanics state complex mutually at the bottom of the tower, the high temperature heat radiation of 320 ℃ of outer walls is difficult to approachingly at the bottom of the tower, and difficulty of test is very big.Before the present invention, still there are not the computation schema of the burnt amount of fractionator prodelta clay in the running status and the report of method of testing both at home and abroad.
GB2237 113A has described a kind of method that detects concrete, brick, the non-heat conductor inherent vice of this class of fiber reinforced plastic.This method needs certain radiation source irradiates material surface of arranging, and makes the measured object surface temperature rise to 50～80 ℃, and evenly; This method also need be pre-estimated the degree of depth of rejected region and determine best irradiation time, is greater than or less than this time all can not observe defective.The different radiation source heats building materialss of similar this use are to detect also having of inherent vice: YA, Popov etal(Defektoskopiya, No6,1975) and EP O 089760(UKAEA) and NABekeshko(Defektoskopiya, No2,1987).
DE3814132 A has introduced a kind of method that detects its defective with the asphalt seal material that manifests on the infrared temperature figure in the difference aspect the radiation.This method is to utilize the distinctive heat absorption of pitch and reflection thermal property and the heat that absorbs from sunlight daytime is still stored characteristics in it evening, takes image in the dark surrounds or the evening at dawn, finds out its rejected region.
More than these examples all be by means of radiation source (comprise artificial and lamp) to target irradiation to be measured, make rejected region and consistance position generation temperature difference, utilize the temperature contrast that manifests on the thermal image figure to determine rejected region again.In addition, they all belong to low-temperature test, radiation sensitive regions is at 8-13 μ m, and temperature test in the invention belongs to, its radiation sensitive regions is at 3-5 μ m, and the long-pending burnt position of observation need not add radiation source, but manifests temperature contrast naturally according to interior of articles temperature and thermal resistance distribution, thereby be not subjected to best heating or the restriction of observing time, also needn't pre-estimate long-pending burnt position.In addition, material flows in the fractionator of the present invention, and long-pending burnt position also changes, thereby different with above several routine static tests.Thermal imaging system calculates two-dimensional temperature field need calculate surface emissivity in advance, and emissivity is relevant with physical chemistry architectural feature, surface oxidation degree, roughness, the temperature of object itself, thereby the emissivity of mark calculation on the spot reliability is the highest.The present invention marks the calculation emissivity on the spot with several thermopairs that are welded in body surface, and measuring accuracy significantly improves.Though GB2237 113A has also installed a kind of temperature inductor at body surface, it is to be used for control to add radiation source, and is different with thermopair purposes among the present invention.
Clear 63-235835 has introduced a kind of novel thermal imaging system, and it has adopted the two-dimensional infrared sensitive element, and replaces mechanical scanning with electron scanning, can obtain high resolution, high-quality thermal pattern, and significantly improve its life-span and reliability.It is not concrete method of testing to certain object.
The objective of the invention is to set up a kind of method (having not yet to see any report) that detects the burnt situation of fractionator prodelta clay in the running status.Over one hundred time exploration analysis and production practices prove that the accuracy rate of this method is 100%.It is transferred for optimizing residual oil steam cracking process behaviour, formulates that the best single, double series and the operating scheme of opening, stop provide in time, foundation reliably, is to alleviate fractionator prodelta clay Jiao, prolongation indispensable effective measure of the cycle of operation.The detection at long-pending burnt position takes place in this method commute, and the scheme of rabbling mechanism provides foundation at the bottom of the tower in order rationally to formulate, to transform, and makes the possibility of tower bottom sediments coke powder reduce to minimum.
The test philosophy synoptic diagram of this method is seen Fig. 1.
Narrate the test philosophy of this method in conjunction with Fig. 1.(1) is the thermal imaging system scanner among Fig. 1, and (2) are the thermal imaging system controller, and (3) are the thermal imaging system display, and (4) are that the data image registering instrument is a video recorder, and (5) are microcomputers, and (6) are outer walls at the bottom of the tower, and (7) are flowlines, and (8) are skirts.Scanner in the thermal imaging system (1) is the electromagnetic heat radiation Conversion of energy from outer wall at the bottom of the tower (6) convey electronic video signals, be converted to corresponding visible light image through signal Processing, the data image registering instrument is that video recorder (4) stores analog signal record, entering microcomputer (5) then handles, according to Si Difen-Boltzmann law, calculate two-dimensional temperature field, that is:
M＝σεT
4
In the formula:
σ-Si Difen-Boltzmann constant, w/m
2K
4
ε-surface emissivity
The T-surface temperature, K
M-total radiation degree, w/m
2
This method invention is further specified in conjunction with Fig. 1.
Utilize the scanner (1) of response wave length, outer wall at the bottom of the fractionator (6) is scanned at 2-5 μ m or 3-6 mu m range.Such scanner is to 320 ℃ blackbody radiation peak value 4.8 μ m sensitivities.When the tower prodelta clay was burnt, the thermal resistance from inside at the bottom of the tower to outer wall increased, and the temperature field that causes outer wall (6) at the bottom of the tower presents different variation characteristics with the difference of long-pending burnt degree, and the burnt situation of inner product just is reflected in the outer wall two-dimensional temperature field at the bottom of the tower.Calculate outer wall emissivity for cooperating thermal imaging system to mark on the spot, on the outer wall diverse location, weld 2-4 before driving thermopair.
This method invention comprises on-the-spot test and data analysis two partly.
On-the-spot test step and instrument parameter are chosen as follows:
1, energized, thermal imaging system controller (2) and display (3) preheating 15 minutes preset instrument parameter, camera lens simultaneously: 20 ° * 20 °, aperture: O, filter: NOF, scope: 500, thermoelectric flat: 385.
2, with skirt (8) at the bottom of scanner (1) the immigration tower, outer wall at the bottom of the tower (6) is scanned, sweep velocity must not be higher than 25/second of thermal imaging system imaging speed, and turn-on data image recorder (4) is noted scanning image simultaneously.
3, the image that shows according to display (3), when seriously amassing Jiao in the tower, the scope that suitably reduces in the scanning process in above-mentioned 1 is put down with thermoelectricity, is as the criterion to see long-pending burnt core position and switch clearly.Usually scope: 500-200 is thermoelectric flat: 385-100, can satisfy the test request of various long-pending burnt situations in the tower.
4, (about 15-25 minute) after the been scanned closes digital image registering instrument (4) and controller (2), display (3), and existing side by side soon, scanner places the good environment of ventilation condition (be preferably scanner and join a thermal radiation resistant cover).
Data analysis:
The above-mentioned on-the-spot gained digital image record that detects by video tape recorder (4) playback, and is shown on the display (3), utilizes microcomputer to calculate as follows and analyze the burnt situation of tower inner product:
1, shows and this shown calorific value of thermal imaging system according to the surface thermocouple temperature, utilize M=σ ε T
4Formula is calculated the emissivity at each point place, thermopair place, and the mean value of getting the emissivity that each point calculates can calculate the temperature field as the outer wall emissivity.
2, if result of calculation is that the outside wall temperature field is even at the bottom of the tower, promptly do not have " gray scale " or " colour " level on the thermal image figure, see Fig. 2-a, show that thermal resistance is even in the tower everywhere, long-pending burnt.
3, if the result be that the most of regional temperature of outer wall is even at the bottom of the tower, low-temperature space " cold spot " only occurs in the part, see Fig. 2-b, show that this place tower internal thermal resistance increases, have local long-pending burntly in it, this is the commitment that amasss Jiao." cold spot " area and " cold spot " core minimum temperature and medial temperature can show the long-pending burnt order of severity.Area is big more, temperature is low more, and then long-pending burnt degree is dark more, and vice versa.Increase end amount of agitation can make early stage long-pending Jiao reduce or disappear.
4, by relatively " cold spot " area, core position variation, can tentatively judge the burnt reason of tower inner product.Stir to flow to move against material in the tower as " cold spot " core position, and its area is to reverse expansion, illustrate the interior corresponding site of tower have fall and under mechanical part stop this place's material proper flow.
5, if result of calculation all covers at the bottom of the tower for " cold spot " area, see Fig. 2-c, show that inside is all long-pending burnt at the bottom of the tower, this moment, the pyrolysis furnace feeder pump was found time if " cold spot " DIE Temperature continues to descend, and was promptly indicating to perform the preparation of parking coke cleaning immediately.
This method invention has following characteristics:
1, the invention provides is contactless temperature-measuring, does not upset outside wall temperature field at the bottom of the tower, has eliminated the error of bringing thus, the restriction that it is not installed by instrument, to scanning at the bottom of the tower easily and fast.
2, the present invention utilizes infra-red thermal imaging instrument can demonstrate long-pending burnt position and area, shape intuitively, also can infer the change of long-pending burnt degree according to its variation tendency, and tentatively judges and the burnt reason of tower inner product provide guide for optimizing technology.
3, this method invention can be found early stage long-pending burntly delicately, and its temperature-measuring range wide (20 ℃-1500 ℃) is particularly suitable for testing the temperature variation of long-pending burnt degree when changing.
4, this method invention utilizes the thermopair of surface-welding to mark to calculate the outer wall emissivity on the spot, not only had save time, intuitively, the characteristics of not test leakage but also guaranteed the degree of accuracy of temperature data.
5, this method is applicable to that all change the chemical plant that causes the outside wall temperature field to change owing to thermal resistance that interior leakage or internal blocking cause, as pipeline, tower, jar etc.
With the following Examples, brief description this method is invented method of implementing and the directive function that technology behaviour is transferred on Yangzi Petrochemical Industry Co., Chinese Petrochemical Industry General Co.'s residual oil steam cracking device.
Example 1, on November 22 nineteen ninety, the infra-red thermal imaging instrument testing result shows that respectively there is 0.25 meter of an area at certain two place at the bottom of the tower
2, the core minimum temperature is 263 ℃ and 264 ℃ " cold spot " respectively, thinks, there have two places to occur in the tower to be early stage long-pending burnt.Amount of agitation at the bottom of strengthening tower, when detecting once more after 3 days, tower outer wall each point temperature evenly is 315 ℃, " cold spot " complete obiteration.This testing result and above-mentioned measure realize that for this device single series links 90 days the objective of the struggle of operation condition precedent is provided.
Example 2, Fig. 3-a are " cold spot " area, minimum temperature curve map over time on April 8th, 1991 to May 2.Wherein " D " is the bi serie runtime, and " S " is the single series runtime, and " T " is somewhere " cold spot " minimum temperature change curve at the bottom of the tower, and " A " is this place " cold spot " area change curve.By Fig. 3-a as seen, an area to occur be 0.25 meter in the somewhere at the bottom of the tower on April 8
2, minimum temperature is 292 ℃ " cold spot ", " cold spot " area increased sharply after several days, had been developed to 2.7 meters of areas to April 22
2, 232 ℃ of minimum temperatures.Long-pending easily burnt at long-pending burnt development critical conditions and bi serie, single series helps pressing down burnt experience, immediately this device is switched to the single series running status by the bi serie running status, " cold spot " area reduces rapidly, see curve among Fig. 3-a " A ", to " cold spot " complete obiteration on May 2, do not had long-pending burnt this moment in the tower, and this is installed on and entered the bi serie running status again on May 4.Like this, adjust running status according to testing result, realize that as much as possible the bi serie operation is to increase the raw material treatment capacity, simultaneously also director the cycle of operation, realized the optimal operation scheme of this imported unit, and started 268 days new record of continuous operation, the crude oil working modulus brings up to 75% by intrinsic 55%.
Somewhere " cold spot " was interim when on August 19th, 1991 to October 4 at the bottom of example 3, accompanying drawing 3-b had been showed tower, and area is curve over time.Wherein, " D " is the bi serie runtime, and " A " is area curve over time in somewhere " cold spot " at the bottom of the tower.By " A " curve among Fig. 3-b as seen, occurring an area at the bottom of the tower on August 19th, 1991 is 1 meter
2" cold spot ", in thereafter 46 days, " cold spot " area increases slowly, an area increment only was 0.017 in average day
2, to analyze in view of the above, long-pending burnt measuring increases slowly, and be little to device operation threat, thus keep the bi serie running status, and started this imported unit bi serie new achievement of 78 days of operation continuously.
Example 4 uses this method invention that the over one hundred inferior testing result of fractionator is shown, has two positions long-pending easily burnt at the bottom of the tower, accounts for " cold spot " respectively and 79% and 21% of sum occurs, facts have proved that it is that local mixing effect is poor that this two place amasss burnt main cause.This two place is determining of long-pending burnt position easily, thereby provide guidance for rabbling mechanism at the bottom of the reasonable transformation tower reduces long-pending burnt occurrence number.
This method invention sees Table 1 in the condition of production of raising before and after implementing on the sub-petro-chemical corporation residual oil steam cracking device.Table 1 data show that the present invention has prolonged the device cycle of operation after being used for instructing production, has reduced the coke cleaning amount, has increased the raw material treatment capacity.The whole year in 1991 after only implementing, the raw material treatment capacity increased by 35.5 ten thousand tons/year than 1989 before implementing, and the crude oil working modulus of this device rises to 75% by intrinsic 55% at present.Along with the change of Middle East oil property, long-pending burnt problem has obtained worldwide concern, and this method invention is to press down burnt indispensable means.
The condition of production contrasted before and after table 1 was implemented the present invention
| Time | On average weekly the phase days running (my god) | Phase average treatment amount (ton/sky) weekly | On average weekly phase coke cleaning amount (rice 3） |
| After implementing before implementing | 52 185 | 1140.5 1847.7 | 56.4 17.5 |
Claims (4)
1, a kind of method that detects residual oil steam cracking device fractionator prodelta clay Jiao with infra-red thermal imaging instrument, it is characterized in that, the change of thermal resistance causes the variation of outside wall temperature field during according to fractionator prodelta clay Jiao, judge that the burnt degree of tower inner product, position, area and development trend thereof instruct technology behaviour to transfer, utilize the thermopair of measured object surface-welding to mark calculation outer wall emissivity on the spot, testing tool parameter: camera lens: 20 ° * 20 °, aperture: 0, filter: NOF, heat rating: 500-200 is thermoelectric flat: 385-100.
2, the thermopair of the surface-welding described in claim 1 is marked on the spot and is calculated the outer wall emissivity, it is characterized in that, the welding 2-4 of outer wall diverse location place is to thermopair at the bottom of tower, calculate the emissivity at each point place according to electric thermo-couple temperature value and thermal imaging system detected value, its mean value is the outer wall materials emissivity.
3, the burnt degree of tower inner product, position, area and development trend thereof are judged in the variation according to outside wall temperature field at the bottom of the fractionator described in claim 1, it is characterized in that:
(1) result of calculation is that the outside wall temperature field is even at the bottom of the tower, show do not have in the tower long-pending burnt;
(2) result of calculation is that the most of regional temperature of outer wall is even at the bottom of the tower, low temperature " cold spot " only occurs in the part, show this place tower at the bottom of inside local long-pending Jiao is arranged;
(3) by relatively " cold spot " area, core position variation, can tentatively determine the burnt reason of inner product;
(4) result of calculation all covers at the bottom of the tower for " cold spot " area, shows that inside is all long-pending burnt at the bottom of the tower, if " cold spot " DIE Temperature continues to descend, should prepare to carry out coke cleaning work.
4, the variation characteristic according to the outside wall temperature field described in claim 1 is judged burnt this method of situation of tower inner product, it is characterized in that, other chemical plants, cause the outside wall temperature field to change as pipeline, tower, a jar thermal resistance variation that causes owing to interior leakage, internal blocking, all be suitable for the inventive method and detect.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 92107770 CN1033534C (en) | 1992-09-24 | 1992-09-24 | Method for detecting bottom coke of fractional column in slag, oil steam cracking device using infrared thermoimager |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 92107770 CN1033534C (en) | 1992-09-24 | 1992-09-24 | Method for detecting bottom coke of fractional column in slag, oil steam cracking device using infrared thermoimager |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1084637A true CN1084637A (en) | 1994-03-30 |
| CN1033534C CN1033534C (en) | 1996-12-11 |
Family
ID=4943039
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 92107770 Expired - Fee Related CN1033534C (en) | 1992-09-24 | 1992-09-24 | Method for detecting bottom coke of fractional column in slag, oil steam cracking device using infrared thermoimager |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1033534C (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102901748A (en) * | 2012-09-18 | 2013-01-30 | 成都思驰科技有限公司 | Nondestructive testing device and method based on pipeline temperature field distribution |
| CN103460000A (en) * | 2010-03-17 | 2013-12-18 | 热波成像股份有限公司 | Thermographic detection of internal passageway blockages |
| US9080453B2 (en) | 2010-03-17 | 2015-07-14 | Thermal Wave Imaging, Inc. | Thermographic detection of internal passageway blockages |
-
1992
- 1992-09-24 CN CN 92107770 patent/CN1033534C/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103460000A (en) * | 2010-03-17 | 2013-12-18 | 热波成像股份有限公司 | Thermographic detection of internal passageway blockages |
| US9080453B2 (en) | 2010-03-17 | 2015-07-14 | Thermal Wave Imaging, Inc. | Thermographic detection of internal passageway blockages |
| CN103460000B (en) * | 2010-03-17 | 2016-01-27 | 热波成像股份有限公司 | The thermal image detection that internal channel blocks |
| CN102901748A (en) * | 2012-09-18 | 2013-01-30 | 成都思驰科技有限公司 | Nondestructive testing device and method based on pipeline temperature field distribution |
| CN102901748B (en) * | 2012-09-18 | 2014-10-22 | 成都思驰科技有限公司 | Nondestructive testing device and method based on pipeline temperature field distribution |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1033534C (en) | 1996-12-11 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101818228B (en) | Control system and control method for tapping and slagging of converter | |
| CN102798294B (en) | Real-time monitoring and safety warning device for temperature of furnace tube of tubular industrial furnace | |
| US20220155249A1 (en) | Online monitoring device and method for fouling and slagging based on capacitance principle differential measurement | |
| CN1940547A (en) | Internal slag heat current inspector and inspection for continuously-casting crystallizer | |
| CN200953005Y (en) | Apparatus for detecting thermal resistance/heat transfer coefficient of blocks | |
| CN1033534C (en) | Method for detecting bottom coke of fractional column in slag, oil steam cracking device using infrared thermoimager | |
| CN104374478B (en) | The temperature discriminating method and measuring device of cracking furnace tube outer wall and inboard wall of burner hearth | |
| JPH06503650A (en) | Non-destructive continuous inspection system and method for thickness changes in section steel | |
| CN115060376B (en) | Aluminum alloy temperature field measurement method based on infrared thermal imaging and iterative algorithm | |
| CN101498578B (en) | On-line detection method for tube coking thickness of delay coking heating stove | |
| CN102455218B (en) | Fluidized bed reactor as well as detection method and device used for detecting reactive state in reactor | |
| Sugiura et al. | Simultaneous measurements of temperature and iron–slag ratio at taphole of blast furnace | |
| JP2015178930A (en) | Furnace refractory product life prediction method | |
| CN201662326U (en) | Dynamic balance test heating device for rotor of gas turbine | |
| JP5461768B2 (en) | Coke oven carbonization chamber diagnostic method | |
| CN102809283A (en) | Method for determining material temperature field in rotary kiln | |
| CN102944667B (en) | A kind of double-reactor coking raw material evaluation system | |
| JP7111583B2 (en) | Method and device for estimating coil outer surface temperature of ethylene production cracking furnace, and ethylene production device | |
| JP4188919B2 (en) | Diagnostic equipment for coke oven carbonization chamber | |
| JP4142333B2 (en) | Coke oven coking chamber diagnostic method | |
| KR100709928B1 (en) | Diagnostic apparatus and diagnostic method for carbonization chamber of coke oven | |
| JP4220800B2 (en) | Method for identifying the trajectory of internal observation means for inspecting a coke oven carbonization chamber using an inspection apparatus for the coke oven carbonization chamber and an inspection method for the coke oven carbonization chamber | |
| CN2327693Y (en) | Temperature sensor for luyer of blast furnace | |
| CN111256779B (en) | System and method for detecting interface position of melt in melting furnace based on thermal radiation theory | |
| RU2790819C2 (en) | Method and device for measuring the outer surface temperature of a radiant coil in a cracking furnace for ethylene production and device for ethylene production |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |