CN101872205A - Automatic control method of online rapid decoking of cracking furnace - Google Patents
Automatic control method of online rapid decoking of cracking furnace Download PDFInfo
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- CN101872205A CN101872205A CN200910082937A CN200910082937A CN101872205A CN 101872205 A CN101872205 A CN 101872205A CN 200910082937 A CN200910082937 A CN 200910082937A CN 200910082937 A CN200910082937 A CN 200910082937A CN 101872205 A CN101872205 A CN 101872205A
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10G—CRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION; RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES
- C10G9/00—Thermal non-catalytic cracking, in the absence of hydrogen, of hydrocarbon oils
- C10G9/14—Thermal non-catalytic cracking, in the absence of hydrogen, of hydrocarbon oils in pipes or coils with or without auxiliary means, e.g. digesters, soaking drums, expansion means
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10G—CRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION; RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES
- C10G9/00—Thermal non-catalytic cracking, in the absence of hydrogen, of hydrocarbon oils
- C10G9/34—Thermal non-catalytic cracking, in the absence of hydrogen, of hydrocarbon oils by direct contact with inert preheated fluids, e.g. with molten metals or salts
- C10G9/36—Thermal non-catalytic cracking, in the absence of hydrogen, of hydrocarbon oils by direct contact with inert preheated fluids, e.g. with molten metals or salts with heated gases or vapours
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10G—CRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION; RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES
- C10G2400/00—Products obtained by processes covered by groups C10G9/00 - C10G69/14
- C10G2400/20—C2-C4 olefins
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- Coke Industry (AREA)
Abstract
The invention relates to a method for automatically controlling online rapid decoking at a radiation section of a cracking furnace in ethylene industry. In the method, a decoking control logic program in a cracking furnace distributed control system (DCS) automatically maintains and adjusts water vapor flow, air flow and furnace tube outlet temperature based on the concentrations, contents and variation treads of carbon monoxide, carbon dioxide and oxygen gas in decoking exhaust monitored in an on-line mode. By the invention, automatic decoking control can be realized at the radiation section of the cracking furnace, the decoking process of the cracking furnace can be monitored, the decoking time of the cracking furnace can be reduced, and the online utilization rate of an industry cracking furnace can be improved, thereby improving the annual output of the industry cracking furnace.
Description
Technical field
The present invention relates to a kind of autocontrol method, more particularly, relate to a kind of autocontrol method that the ethylene industry pyrolysis furnace burns coke cleaning that is used for.
Background technology
Ethene is one of most important basic material of petro chemical industry, and the development level of ethylene industry has been represented the level of a national petro chemical industry generally.The method of producing ethene is a lot, and is the most ripe with the pyrolysis in tubular furnace technology, have relatively simple for structure, running is stable and the yield of ethene advantages of higher.Ethane cracking furnace is one of key equipment of ethylene production.Cracking stock generates the subsidiary reactions such as polymerization, aromatic hydrocarbons dehydrogenation and annelation of also following unsaturated hydrocarbon in the products such as ethene, propylene under hot conditions, reaction product is progressively in boiler tube inwall deposition and form burnt layer.Because coke is the poor conductor of heat, the coke that is deposited on the boiler tube inwall causes the furnace tube outer wall temperature to raise; Coke also causes the boiler tube caliber to diminish on the other hand, and pressure drop increases, and therefore becomes the principal element of the cycle of operation of restriction pyrolysis furnace.In order to safeguard ordinary production, pyrolysis furnace must regularly carry out the coke cleaning operation.
At present, tube cracking furnace radiation section coke cleaning has been realized the online coke cleaning of not blowing out of robotization substantially.This kind coke cleaning method can guarantee pyrolysis furnace under the situation of not blowing out, water vapour and air is fed radiant coil according to certain ratio carry out coke cleaning, and it is fast to have coke cleaning speed, easy to operate, the advantage that is easy to control.
The online coke cleaning program of existing pyrolysis furnace generally is divided into two big steps: radiant coil and waste heat boiler coke-removing procedure.The coke cleaning stage to radiant coil roughly can be divided into for 10～30 time periods in step.There are four control variable in each step, i.e. coke cleaning time, steam rates, air mass flow, coil outlet temperature (COT).Under the control of coke cleaning program, adjust the coke cleaning parameters stage by stage automatically, it is clean that coke is removed.The coke cleaning stage to waste heat boiler can be divided into for 2～10 time periods in step, the pure air coke cleaning of general employing of waste heat boiler coke cleaning stage.
Coke at high temperature carries out chemical reaction with the water vapour air mixture, generates carbon monoxide and carbon dioxide, emits heat simultaneously.Under normal conditions, the coke cleaning procedure operation elasticity that pyrolysis furnace patent merchant provides is bigger, water vapour/AIR Proportional is bigger during the pyrolysis furnace coke cleaning, the concentration of oxygen in potpourri is lower in boiler tube, guarantee that the reaction of oxygen and coke is slower, acutely emit heat and too much boiler tube is damaged to prevent char combustion.
The cracking stock change of properties of the many pyrolysis furnaces in domestic ethylene plant is bigger, the difference of its coke characteristic is also very big, pyrolysis furnace patent provider is when providing the coke cleaning technology, consider the characteristic of different cracking stock cokings, often provide a relatively conservative coke cleaning program, therefore there is the possibility of coke cleaning overlong time behind a certain raw material of cracking, causes the waste of resource.
In the actual coke cleaning operating process of factory, only several coke cleaning steps are carried out the off-line sample analysis, whether coke cleaning is clean to confirm radiant coil, the sample analysis result often relatively lags behind, therefore cause the coke cleaning time often than the length that designs, have a strong impact on the online production time of tube cracking furnace, increased the production cost of ethene, reduced the economic benefit of pyrolysis furnace.
CN1155680C discloses a kind of autocontrol method of in-line coke-removing procedure of cracking furnace, and its control program operates on the application module of computer distributed control system (DCS).This method mainly is by computer program coke cleaning steam flow, coke cleaning air mass flow and coil outlet temperature to be controlled, and automatically realizes the steady decoking of pyrolysis furnace.Because do not have the feedback of concentration of carbon dioxide in the on-line analysis coke cleaning tail gas, this method is just rule of thumb set input variable with each variable, can not carry out real-time regulation and control to coke-removing procedure according to the practical extent of coke cleaning.
CN1282730C discloses a kind of method of on-line monitoring burn off coke process, this method is included in pyrolysis furnace or the quenching boiler exit logistics leadout hole that to open an internal diameter be 10～15mm, insert delivery line from this hole, coke cleaning tail gas is introduced refrigeratory, gas meter and on-line monitoring equipment by conduit, and wherein said on-line monitoring equipment comprises gas purifying equipment, infrared spectrum analyser and data processor.In this patent, do not analyze the content of oxygen in the coke cleaning tail gas, and, adjust the coke cleaning step for the coke cleaning control program in the DCS system according to the automatic follow procedure of coke cleaning tails assay result and do not make and specifying because emphasis is mentioned the in-line purification and the analytical equipment of coke cleaning tail gas in this patent.
Therefore, use the analysis Monitoring Data of the coke cleaning steering logic program of DCS system according to the coke cleaning tail gas that is obtained, automatically keep and adjust the parameters of coke-removing procedure, reduce the coke cleaning time as far as possible, carry out safety, rapid decoking, improving the tube cracking furnace online production time, is to improve one of the output of tube cracking furnace and important channel of factory economy benefit.
Summary of the invention
The coke cleaning program of present most ethylene industry pyrolysis furnaces is all taked a certain proportion of water vapour and AIR MIXTURES coke cleaning.Remove in the process of coke at industrial pyrolysis furnace, the factor that influences coke cleaning speed has three kinds: air capacity, water vapour amount and coil outlet temperature (COT).In order to improve the char combustion speed of industrial pyrolysis furnace, the way that can take has: improve air capacity, reduce the water vapour amount, improve coil outlet temperature.
In the inventive method, Distributed Control System (DCS) is that the coke cleaning steering logic program of DCS system is utilized carbon dioxide, carbon monoxide and the concentration of oxygen in the online analytical instrument on-line analysis industrial pyrolysis furnace coke cleaning tail gas dry gas, and is stored in the fixed memory unit by automatic collection analysis result data.
In the methods of the invention, the coke cleaning steering logic program of DCS system is according to the height and the variation tendency of carbon dioxide, carbon monoxide, oxygen concentration content in the coke cleaning tail gas that is monitored, automatically keep and adjustment coke cleaning steam flow, coke cleaning air mass flow and coil outlet temperature, realize the steady coke cleaning of pyrolysis furnace automatically.
The major control variable of coke cleaning steering logic program is coke cleaning steam flow, coke cleaning air mass flow and coil outlet temperature, and main regulated variable is coke cleaning steam flow controller, coke cleaning air flow controller and pyrolysis furnace fuel gas pressure.
Concrete technical scheme is as follows:
The autocontrol method of the online rapid decoking process of pyrolysis furnace radiation section provided by the invention is: in industrial pyrolysis furnace radiation section coke-removing procedure, real-time online is analyzed carbon monoxide, carbon dioxide and the concentration of oxygen of coke cleaning tail gas dry gas, on-line analysis teletransmission is as a result gone in the pyrolysis furnace Distributed Control System (DCS), and adjustment enters one, two or three coke cleaning parameters in steam flow, air mass flow and the coil outlet temperature of pyrolysis furnace to the coke cleaning steering logic program of Distributed Control System (DCS) according to the on-line analysis data.
More particularly, after keeping coke cleaning parameter at least 15 minutes constant, in meeting the following conditions at least one the time:
(a) gas concentration lwevel is 4%≤CO in the described coke cleaning tail gas dry gas
2≤ 6%, and the concentration and the concentration of carbon dioxide of carbon monoxide all keeps stable in the described coke cleaning tail gas dry gas;
(b) gas concentration lwevel is 4%≤CO in the described coke cleaning tail gas dry gas
2≤ 6%, and the concentration of carbon monoxide continues to descend in the described coke cleaning tail gas dry gas;
(c) gas concentration lwevel is 4%≤CO in the described coke cleaning tail gas dry gas
2≤ 6%, and continue to descend;
The measure of regulating pyrolysis furnace coke cleaning parameter is: based on the parameter current value, increase by 10%～100% air mass flow and reduce by 5%～25% quantity of steam, the biggest quality velocity ratio example of air and water vapour is not higher than 1: 1, and water vapour and air gross mass flow rate make venturi before and after pressure ratio greater than 0.9;
When gas concentration lwevel is lower than 4% in the coke cleaning tail gas dry gas,, increases by 10%～100% air mass flow, reduce by 5%～25% quantity of steam and improve 5 ℃～30 ℃ coil outlet temperature based on the parameter current value; When coil outlet temperature is adjusted to the maximum temperature that coke cleaning steering logic program allowed, prolong the time of burning to gas concentration lwevel less than 0.2%, radiant coil is controlled coke-removing procedure automatically and is finished;
After per step parameter regulation, if in the coke cleaning tail gas dry gas oxygen concentration greater than 12% and gas concentration lwevel be lower than 8%, then carry out adjusted parameter, otherwise return the parameter before adjusting.
Preferably, preceding 4 steps in coke cleaning steering logic program adjustment coke cleaning parameter preferably keep the coke cleaning steam flow constant, only improve the coke cleaning air mass flow.
Preferably, the coke cleaning steering logic program of Distributed Control System (DCS) was judged to determine whether to need to regulate the coke cleaning parameter coke cleaning tail gas dry gas analysis data every 1～30 minute.
Preferably, the coke cleaning steering logic program of Distributed Control System (DCS) is carried out initialization with steam flow, air mass flow and the coil outlet temperature variable of pyrolysis furnace radiation section coke cleaning initial period, and in the work internal memory of packing into.
More preferably, initial coil outlet temperature is 780～800 ℃.
More preferably, initial coil outlet temperature is 800 ℃.
More preferably, initial steam flow is the pyrolysis furnace flow that purges steam.
More preferably, the initial air flow is 1/20～1/2 of an initial steam flow.
More preferably, the initial air flow is 1/10 of an initial steam flow.
In the present invention, if do not particularly point out, described concentration all refers to volume percent content, and described flow all refers to mass rate.
In the method for the invention, in described coke cleaning automatic control process, in the control coke cleaning tail gas dry gas oxygen concentration greater than 12% and gas concentration lwevel be lower than 8%, can not satisfy under this requirement numerical value before need be with coke cleaning parameter adjustment readjustment whole.If in the coke cleaning tail gas dry gas oxygen concentration cross low or gas concentration lwevel too high, illustrate that char combustion reaction is too violent, the big calorimetric meeting that reaction is emitted burns out cracking furnace tube.
In coke cleaning steering logic program of the present invention, the principle of its adjusting is preferentially to adjust the flow of coke cleaning air and coke cleaning steam, and next adjusts coil outlet temperature.Coke cleaning steering logic program is analyzed data, the air capacity when regulating coke cleaning automatically, water vapour amount, coil outlet temperature according to the real-time online of carbon dioxide, carbon monoxide and oxygen concentration in the industrial pyrolysis furnace coke cleaning tail gas dry gas.
The described coke cleaning steering logic of the inventive method program is regulated in the process of each control variable of coke cleaning, the biggest quality velocity ratio example of air and water vapour should not be higher than 1: 1, and the total mass flow rate of water vapour and air must be in the scope of venturi control, and pressure ratio was greater than 0.9 before and after promptly water vapour and air gross mass flow rate made venturi; If air and water vapour biggest quality ratio reach 1: 1, coke cleaning steering logic program acquiescence can only be regulated coil outlet temperature, if coil outlet temperature is adjusted to the mxm. that program allows, by the time the radiant coil incipient scorch clean after again to the transition of pure air coke cleaning, promptly in the coke cleaning tail gas dry gas gas concentration lwevel less than 0.2%.
In the method for the invention, described industrial crack furnace radiant coil coke cleaning ending standard is the gas concentration lwevel in the coke cleaning tail gas dry gas, is lower than 0.2% standard according to the gas concentration lwevel in the described coke cleaning tail gas dry gas and carries out.
In the automatic coke-removing procedure of described industrial pyrolysis furnace radiation section, generally described coil outlet temperature (COT) is controlled between 780～870 ℃.When gas concentration lwevel in the coke cleaning tail gas dry gas is low (being lower than 4%), can adopt the raising coil outlet temperature to accelerate coke cleaning speed, the temperature increase rate is generally 5～30 ℃.Coke cleaning steering logic program can be monitored oxycarbide and concentration of oxygen situation of change automatically after the coil outlet temperature adjustment, if concentration of carbon dioxide is not higher than 8%, oxygen concentration is not less than 12%, otherwise Automatic Program is got back to the numerical value of previous step with the coil outlet temperature adjusting of revising.
The online coke-removing procedure of pyrolysis furnace radiation section is divided into three steps: the program initialization stage; The radiant coil coke cleaning stage; Radiant coil coke cleaning ending phase.The execution sequence of automatic control program is as follows:
1, the program initialization stage
Behind the program start, at first built-in variables such as coke cleaning steam flow, coke cleaning air mass flow, coil outlet temperature are carried out initialization, and discern the analysis result signal of coke cleaning tail gas online analytical instrument automatically.
Confirm that by operating personnel all execute-in-places all are finished, on-the-spot on-line analysis device data inserts normal, and has been ready to enter automatic control and burns the stage, as is not identified then that program is in waiting status, up to whole affirmations.Begin to enter coke cleaning by operating personnel's click and control the stage automatically.
2, the radiant coil coke cleaning stage
After entering the coke cleaning automatic control program, coke cleaning steering logic program is obtained carbon dioxide, carbon monoxide and concentration of oxygen data in the coke cleaning tail gas of on-the site analysis instrument on-line analysis by pyrolysis furnace DCS system, and every 1-30 minute coke cleaning tail gas dry gas is analyzed data according to judgment principle and judge whether to need to adjust each control variable of coke cleaning, realize the automatic control of each parameter of coke-removing procedure, finish until the radiation section coke-removing procedure.Minimum maintenance is 15 minutes after each parameter of adjustment coke cleaning, can be to carry out parameter adjustment once more.
In the coke-removing procedure automatic control process, the coke cleaning automatic control program is monitored significant variables such as coke cleaning steam flow, coke cleaning air mass flow, coil outlet temperatures, in case the excessive situation of deviation occurs, program will enter hold mode, display alarm information is carried out audible alarm simultaneously.
3, radiant coil coke cleaning ending phase
Concentration of carbon dioxide is less than 0.2% the time in coke cleaning tail gas when coke cleaning steering logic sequential monitoring, and Automatic Program is reminded operating personnel, and coke cleaning tails assay data are qualified, can enter the waste heat boiler coke cleaning stage.Manually stop the coke cleaning automatic control program by operating personnel, and adjust to the pure air waste heat boiler coke cleaning stage.
Description of drawings
Fig. 1 carbon dioxide and carbonomonoxide concentration distribution plan in the coke cleaning tail gas dry gas when adopting former coke cleaning program.
Fig. 2 is carbon dioxide and an oxidation two concentration of carbon distribution plans in the coke cleaning tail gas dry gas when adopting method of the present invention.
Embodiment
Further describe the present invention below in conjunction with embodiment.Scope of the present invention is not subjected to the restriction of these embodiment, and scope of the present invention proposes in claims.
Method of the present invention is applied to pyrolysis furnace radiation section coke-removing procedure.This industrial pyrolysis furnace is a SL-I type pyrolysis furnace, and cracking stock can adopt naphtha, heavy gas oil and hydrogenation tail oil, produces 100000 tons of ethene per year.The online coke cleaning program of the original radiation section of pyrolysis furnace was 21 steps, and design time is 23 hours (not comprising the steam blowing boiler tube time), and according to the carbon monoxide of former coke cleaning program and gas concentration lwevel curve map as shown in Figure 1, former coke cleaning program is listed in table 1.
The automatic control coke cleaning method of the application of the invention according to the data of online analytical instrument on-the site analysis, is controlled coke-removing procedure automatically by the coke cleaning control module, specifically lists in table 1, and carbon monoxide and gas concentration lwevel distribution plan are seen Fig. 2 in the coke cleaning tail gas.Adopt automatic control coke cleaning method of the present invention, before coke cleaning the 1st goes on foot pure air coke cleaning of the 15th step, only used 6.5 hours, saved for 72% time than former coke cleaning program.
See Table 1 according to method coke cleaning control program module of the present invention according to the parameters that coke cleaning tails assay result is adjusted.
After entering automatic coke-removing procedure, coke cleaning steam initial flow is 5500Kg/h, the initial air flow is 1/20 of an initial steam flow, preceding 4 steps keep steam flow constant, only adjust air mass flow, and gas concentration lwevel drops to 4.5% by incipient 5.0%, carbonomonoxide concentration drops to 2.8% by 3.5%, up to the 4th step, gas concentration lwevel is stabilized in about 4.3%, and carbonomonoxide concentration is but continuing decline.Begin to reduce steam rates this moment, improves air mass flow simultaneously.The beginning of the 6th step, gas concentration lwevel has been lower than 4%, thus begin to improve coil outlet temperature, and adjust coke cleaning steam and coke cleaning air mass flow simultaneously, up to 11 steps, coil outlet temperature is adjusted to the maximum temperature that coke cleaning steering logic program requires.Carbon dioxide and the carbonomonoxide concentration of being in course of adjustment all continues to descend, so the time of each time step is 15 minutes.After the 12nd step, gas concentration lwevel drops to about 0.7%.According to pyrolysis furnace coke cleaning operation requirement, gas concentration lwevel must be less than 0.2% in the coke cleaning tail gas, and the radiant coil coke cleaning is qualified, therefore the 13rd gone on foot the coke cleaning time remaining after 120 minutes, and gas concentration lwevel drops to 0.1% by 0.7%.Burn the tails assay result qualified after, increase air capacity and reduce the water vapour amount simultaneously, gradually to pure air transition, until to 14 steps, pyrolysis furnace radiation section coke-removing procedure finishes.Gas concentration lwevel is lower than 8% all the time in whole automatic control coke-removing procedure, and therefore the control coke cleaning method has been guaranteed the safety of boiler tube in coke-removing procedure automatically.
Table 1, the concrete coke cleaning program contrast of carrying out of coke cleaning steering logic program
Claims (10)
1. the autocontrol method of the online rapid decoking process of pyrolysis furnace radiation section, it is characterized in that, in industrial pyrolysis furnace radiation section coke-removing procedure, real-time online is analyzed carbon monoxide, carbon dioxide and the concentration of oxygen of coke cleaning tail gas dry gas, on-line analysis teletransmission is as a result gone in the pyrolysis furnace Distributed Control System (DCS), and adjustment enters one, two or three coke cleaning parameters in steam flow, air mass flow and the coil outlet temperature of pyrolysis furnace to the coke cleaning steering logic program of Distributed Control System (DCS) according to the on-line analysis data.
2. autocontrol method as claimed in claim 1 is characterized in that, after keeping coke cleaning parameter at least 15 minutes constant, in meeting the following conditions at least one the time:
(a) gas concentration lwevel is 4%≤CO in the described coke cleaning tail gas dry gas
2≤ 6%, and carbon monoxide and concentration of carbon dioxide all keep stable in the described coke cleaning tail gas dry gas;
(b) gas concentration lwevel is 4%≤CO in the described coke cleaning tail gas dry gas
2≤ 6%, and the concentration of carbon monoxide continues to descend in the described coke cleaning tail gas dry gas;
(c) gas concentration lwevel is 4%≤CO in the described coke cleaning tail gas dry gas
2≤ 6%, and continue to descend;
The measure of regulating pyrolysis furnace coke cleaning parameter is: based on the parameter current value, increase by 10%～100% air mass flow and reduce by 5%～25% quantity of steam, the biggest quality velocity ratio example of air and water vapour is not higher than 1: 1, and water vapour and air gross mass flow rate make venturi before and after pressure ratio greater than 0.9;
When coke cleaning tail gas dry gas gas concentration lwevel is lower than 4%,, increases by 10%～100% air mass flow, reduce by 5%～25% quantity of steam and improve 5 ℃～30 ℃ coil outlet temperature based on the parameter current value; When coil outlet temperature is adjusted to the maximum temperature that coke cleaning steering logic program allowed, prolong the time of burning to gas concentration lwevel less than 0.2%, radiant coil is controlled coke-removing procedure automatically and is finished;
After per step parameter regulation, if in the coke cleaning tail gas dry gas oxygen concentration greater than 12% and gas concentration lwevel be lower than 8%, then carry out adjusted parameter, otherwise return the parameter before adjusting.
3. autocontrol method as claimed in claim 1 or 2 is characterized in that, the coke cleaning steering logic program of Distributed Control System (DCS) was analyzed data every 1～30 minute to coke cleaning tail gas dry gas and judged to determine whether to need to regulate the coke cleaning parameter.
4. autocontrol method as claimed in claim 1 or 2 is characterized in that, preceding 4 steps in coke cleaning steering logic program adjustment coke cleaning parameter preferably keep the coke cleaning steam flow constant, only improve the coke cleaning air mass flow.
5. autocontrol method as claimed in claim 1, it is characterized in that, the coke cleaning steering logic program of Distributed Control System (DCS) is carried out initialization with steam flow, air mass flow and the coil outlet temperature variable of pyrolysis furnace radiation section coke cleaning initial period, and in the work internal memory of packing into.
6. autocontrol method as claimed in claim 5 is characterized in that, initial coil outlet temperature is 780～800 ℃.
7. autocontrol method as claimed in claim 5 is characterized in that, preferred initial coil outlet temperature is 800 ℃.
8. autocontrol method as claimed in claim 5 is characterized in that, initial steam flow is the pyrolysis furnace flow that purges steam.
9. autocontrol method as claimed in claim 5 is characterized in that, the initial air flow is 1/20～1/2 of a steam flow.
10. autocontrol method as claimed in claim 5 is characterized in that, preferred initial air flow is 1/10 of a steam flow.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102226260A (en) * | 2011-05-05 | 2011-10-26 | 华东理工大学 | Method for improving thermophysical property of coking inhibition silicon/sulfur composite coating of ethene cracking apparatus |
| CN106970542A (en) * | 2017-03-27 | 2017-07-21 | 合肥瑞石测控工程技术有限公司 | One kind visualization pyrolysis furnace charring state monitoring apparatus |
| CN108958195A (en) * | 2018-07-23 | 2018-12-07 | 合肥金星机电科技发展有限公司 | Ethane cracking furnace burning process control method |
| CN113110638A (en) * | 2021-04-20 | 2021-07-13 | 万华化学集团股份有限公司 | Automatic control method for ethylene cracking furnace coke burning, storage medium and electronic equipment |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107418614B (en) * | 2017-07-24 | 2019-05-14 | 天津大学 | Online decoking method for hydrocarbon fuel tubular cracking furnace |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR940009317A (en) * | 1992-10-05 | 1994-05-20 | 알버트 어네스트 가레드 | Coke removal method using air pulse |
| CN1155680C (en) * | 2002-03-12 | 2004-06-30 | 扬子石油化工股份有限公司 | Autocontrol method for in-line coke-removing procedure of cracking furnace |
| CN1282730C (en) * | 2003-07-30 | 2006-11-01 | 中国石油化工股份有限公司 | Methd for on-line monitoring coke burning-off process |
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2009
- 2009-04-27 CN CN2009100829377A patent/CN101872205B/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102226260A (en) * | 2011-05-05 | 2011-10-26 | 华东理工大学 | Method for improving thermophysical property of coking inhibition silicon/sulfur composite coating of ethene cracking apparatus |
| CN106970542A (en) * | 2017-03-27 | 2017-07-21 | 合肥瑞石测控工程技术有限公司 | One kind visualization pyrolysis furnace charring state monitoring apparatus |
| CN108958195A (en) * | 2018-07-23 | 2018-12-07 | 合肥金星机电科技发展有限公司 | Ethane cracking furnace burning process control method |
| CN113110638A (en) * | 2021-04-20 | 2021-07-13 | 万华化学集团股份有限公司 | Automatic control method for ethylene cracking furnace coke burning, storage medium and electronic equipment |
| CN113110638B (en) * | 2021-04-20 | 2022-03-11 | 万华化学集团股份有限公司 | Automatic control method for ethylene cracking furnace coke burning, storage medium and electronic equipment |
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