CN204022473U - Sulfur recovery facility H 2s/SO 2ratio control system - Google Patents
Sulfur recovery facility H 2s/SO 2ratio control system Download PDFInfo
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- CN204022473U CN204022473U CN201420407130.2U CN201420407130U CN204022473U CN 204022473 U CN204022473 U CN 204022473U CN 201420407130 U CN201420407130 U CN 201420407130U CN 204022473 U CN204022473 U CN 204022473U
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Abstract
The utility model relates to sulfur recovery facility control techniques field, particularly a kind of sulfur recovery facility H
2s/SO
2ratio control system.This system is connected with dcs DCS, and described system comprises main air distribution controller, secondary air distribution controller and real-time data base; Described system also comprises process parameter load module, controling parameters acquisition module, secondary air distribution coefficients calculation block, secondary air distribution tracking computing module, main air distribution coefficients calculation block, the tracking of main air distribution computing module, major-minor air distribution set(ting)value output module.The sulfur recovery facility H that the utility model provides
2s/SO
2ratio control system, by effective control H
2s/SO
2ratio, makes the H in sulphur tail gas processed
2s/SO
2the steady rate of ratio improves, and sulphur content reduces, thus reduces the load of follow-up tail gas hydrogenation treating part, and the final sulphur content reducing the emptying flue gas of device, realizes significant economic benefit and social benefit.
Description
Technical field
The utility model relates to sulfur recovery facility control techniques field, particularly a kind of sulfur recovery facility H
2s/SO
2ratio control system.
Background technology
Sulfur recovery facility is a link in oil refining enterprise's waste water processes, along with social progress, to sulfur recovery facility SO
2emission request more and more higher.Current domestic SO
2emission standard performs GB16297-1996 " discharge standard of air pollutants ", standard regulation SO
2emission concentration is less than 960mg/Nm
3.National departments concerned is fermenting revision discharge standard of air pollutants, requires newly-built sulfur recovery facility SO
2emission concentration is less than 400 mg/Nm
3, particular locality is less than 200 mg/Nm
3.
Affect SO
2the principal element of emission concentration has sour gas quality, desulfurization solvent quality, absorption tower temperature, catalyst performance, molten sulfur degasification waste gas, air distribution control etc.
In oil refining process, various desulfurizer produces sour gas, and its main component is hydrogen sulfide (H
2s), ammonia (NH
3), nitrogen (N
2) etc.The effect of sulfur recovery facility is sulphur by the sulphur conversion in sour gas as much as possible, reduces the desulphurization amount entering air as far as possible.The technical process brief introduction of sulfur recovery facility is as follows:
Hydrogen sulfide and air enter burner for producing sulfur, mainly carry out the chemical reaction shown in following 3 formulas:
2H
2S+O
2＝2H
2O+2S （1）
2H
2S+3O
2＝2SO
2+2H
2O （2）
2H
2S＋SO
2＝3S＋2H
2O （3）
The hydrogen sulfide of about 2/3rds and oxygen occur to react shown in (formula 1), generate sulphur steam (S) and water (H
2o); The hydrogen sulfide of about 10% and oxygen occur to react shown in (formula 2), generate sulfurous gas (SO
2) and water (H
2o); The hydrogen sulfide of about 20% and sulfurous gas occur to react shown in (formula 3), generate sulphur steam (S) and water (H
2o).
Process Gas after burner for producing sulfur is reacted, more in succession enter reaction converter and condenser.In reaction converter, most of hydrogen sulfide (H
2and sulfurous gas (SO S)
2) there is reaction shown in (formula 3), generate sulphur steam (S) and water vapor (H
2o).
After condenser, sulphur steam (S) is condensed into liquid state, enters sulphur sealed cans.The ratio that the sulphur composition extracted accounts for sour gas sulfur-bearing total amount is called transformation efficiency.Under normal circumstances, transformation efficiency is higher than 95%.Sweetening process gas containing a small amount of sulphur composition enters and adds hydrogen partial.
Most sulphur compositions in sweetening process gas are reduced to hydrogen sulfide (H by hydrogenation unit
2and be separated S), hydrogen sulfide returns sulfur plant, enters air containing after the Process Gas burning of Determination of Trace Sulfur composition.Emptying sulfur dioxide in flue gas (SO
2) content is fewer, environmental pollution is lighter.
In above-mentioned technological process, wish that sulfur plant extracts the sulphur composition in sour gas as much as possible, namely wish that transformation efficiency is high as far as possible, to reduce the desulphurization amount entering air as far as possible.
The underlying condition improving transformation efficiency is, ensures the ratio (H of hydrogen sulfide and sulfurous gas in burner for producing sulfur and reaction converter
2s/SO
2) be stabilized in optimum value.From (formula 3), in theory, this optimum value is 2.Keep H
2s/SO
2than value stabilization, key is the air capacity ensureing to enter burner for producing sulfur is just aequum.
Air is many, and shown in (formula 2), reaction is many, SO
2on the high side, H
2s/SO
2ratio is on the low side; Little air, shown in (formula 2), reaction is few, SO
2on the low side, H
2s/SO
2ratio is higher; Reaction shown in both of these case is all unfavorable for (formula 3).
But in actually operating, added air capacity is difficult to keep suitable, mainly contains following several respects reason:
(1) sour gas flow rate fluctuation.Along with sulphur content fluctuation in crude oil, the fluctuation of amount of finish, and other fluctuation of upstream device, unavoidably cause sour gas flow rate fluctuation;
(2) hydrogen sulfide (H in sour gas
2s) content fluctuation.Due to above-mentioned same reason, hydrogen sulfide content fluctuation in sour gas;
(3) sour gas high purity propylene content; Or for H in sour gas
2s content is low, needs the extra fuel that adds to maintain the device of furnace temperature, the change of fuel quantity;
(4) for the device burning ammonia process, the change of ammonia content.
Above-mentioned several change, all need added air capacity to change thereupon, wherein (2), (3), (4) class reason have no way of predicting, conventional control means are difficult to control, although major part device is provided with automatic control means in air distribution link, but in actual motion, major part is in manual or partially manual state, H
2s/SO
2ratio wide fluctuations.
H
2s/SO
2ratio departs from ideal value 2, i.e. H
2on the low side or the SO of S
2on the low side, even often there is last condenser stage outlet H in actual motion
2s or SO
2content is the situation of zero, this means that in burner for producing sulfur, one-level conversion reactor, secondary conversion reactor, shown in (formula 3), reaction can not normally be carried out, extreme case next stage conversion reactor, secondary conversion reactor do not work, thus reduce transformation efficiency, increase the sulfurous gas (SO entering air
2) quantity discharged.
Summary of the invention
(1) technical problem that will solve
The purpose of this utility model is to provide a kind of sulfur recovery facility H
2s/SO
2ratio control system, to overcome prior art H
2s/SO
2ratio fluctuation is large, causes strengthening the sulfurous gas (SO entering air
2) quantity discharged, cause the problem of environmental pollution.
(2) technical scheme
For solving the problem, the utility model provides a kind of sulfur recovery facility H
2s/SO
2ratio control system, described system is connected with dcs DCS, and described system comprises main air distribution controller, secondary air distribution controller and real-time data base; Described system also comprises:
Process parameter load module, for obtaining H from DCS
2s/SO
2the set(ting)value of ratio and observed value, acid gas stream measurement, main air distribution measurement, secondary air distribution measurement, and deliver in described real-time data base;
Controling parameters acquisition module, for the parameter value of the parameter value and secondary air distribution controller that input described main air distribution controller to described real-time data base;
Main air distribution controller and secondary air distribution controller obtain whole parameter value of described main air distribution controller and whole parameter values of described secondary air distribution controller from described real-time data base; The state of described main air distribution controller comprises manual mode and auto state; The state of described secondary air distribution controller comprises manual mode and auto state;
Secondary air distribution coefficients calculation block, for when described secondary air distribution controller is in manual mode, exports secondary air distribution coefficient, and this secondary air distribution coefficient is from the secondary air distribution amount of motion tracking; When described secondary air distribution controller is in auto state, according to H
2s/SO
2ratio deviation and the parameter value of described secondary air distribution controller, calculate correction and obtain secondary air distribution coefficient, make H
2s/SO
2ratio deviation is in presetting range; Wherein, described H
2s/SO
2ratio deviation be described H
2s/SO
2the set(ting)value of ratio and the difference of observed value; Described H
2s/SO
2ratio deviation and sour gas in hydrogen sulfide content changes, the disturbance of hydrocarbon impurities content has corresponding relation;
Secondary air distribution follows the tracks of computing module, for the observed value according to described secondary air distribution coefficient and described sour gas flow, calculates secondary air distribution optimization setting value, and inputs in described real-time data base by described secondary air distribution optimization setting value;
Main air distribution coefficients calculation block, for when described main air distribution controller is in manual mode, export main air distribution coefficient, this main air distribution coefficient is from the main air distribution amount of motion tracking; When described main air distribution controller is in auto state, according to the observed value of described secondary air distribution, calculate correction and obtain main air distribution coefficient;
Main air distribution follows the tracks of computing module, for the observed value according to described main air distribution coefficient and described sour gas flow, calculates the optimization setting value of main air distribution, and the optimization setting value of described main air distribution is inputed to described real-time data base;
Major-minor air distribution set(ting)value output module, for the optimization setting value of the optimization setting value and described secondary air distribution that obtain described main air distribution from described real-time data base, and deliver to described DCS, by described DCS according to the optimization setting value of the optimization setting value of described main air distribution and described secondary air distribution to described H
2s/SO
2ratio controls.
(3) beneficial effect
The utility model provides a kind of sulfur recovery facility H
2s/SO
2ratio control system, by effective control H
2s/SO
2ratio, makes the H in sulphur tail gas processed
2s/SO
2the steady rate of ratio improves, and sulphur content reduces, thus reduces the load of follow-up tail gas hydrogenation treating part, and the final sulphur content reducing the emptying flue gas of device, realizes significant economic benefit and social benefit.
Accompanying drawing explanation
Fig. 1 is a kind of sulfur recovery facility H of the utility model embodiment
2s/SO
2ratio control system schematic diagram.
Embodiment
Below in conjunction with drawings and Examples, embodiment of the present utility model is described in further detail.Following examples for illustration of the utility model, but are not used for limiting scope of the present utility model.
embodiment one
Described a kind of H
2s/SO
2ratio control system can with dcs (Distributed Control System, DCS) connect, described system can comprise main air distribution controller 100, secondary air distribution controller 102, real-time data base 104, process parameter load module 106, controling parameters acquisition module 108, secondary air distribution coefficients calculation block 110, secondary air distribution tracking computing module 112, main air distribution coefficients calculation block 114, the tracking of main air distribution computing module 116, major-minor air distribution set(ting)value output module 118.
According to the function of above-mentioned each module, described system can also be divided into four module, be respectively: data input module, secondary air distribution controller control module, main air distribution controller control module, and, data outputting module.
Introduce the function of each module below respectively in detail, and the relation between each module.
One, data input module can be made up of process parameter load module 106 and controling parameters acquisition module 108.
Process parameter load module 106, for obtaining H from DCS
2s/SO
2the set(ting)value of ratio and observed value, the observed value of sour gas flow, the observed value of main air distribution amount, the observed value of secondary air distribution amount, and deliver in described real-time data base 104;
Controling parameters acquisition module 108, for the parameter value of the parameter value and secondary air distribution controller 102 that input described main air distribution controller 100 to described real-time data base 104.
Described process parameter load module 106 can obtain some relevant informations from DCS, inputs in real-time data base 104.The resources such as the data stored in real-time data base 104 or information can be acquired by some or all of following modules.
Two, secondary air distribution controller control module can be made up of secondary air distribution coefficients calculation block 110 and secondary air distribution tracking computing module 112.
Secondary air distribution controller 102 obtains whole parameter values of described secondary air distribution controller 102 from described real-time data base 104.
Wherein, the state of described main air distribution controller 100 can be divided into manual mode and auto state; The state of described secondary air distribution controller 102 can be divided into manual mode and auto state.
According to the difference of the state of described secondary air distribution controller 102, described secondary air distribution coefficients calculation block 110 can be divided into two kinds of operating mode:
(1) when described secondary air distribution controller 102 is in manual mode.
Secondary air distribution coefficients calculation block 110, for exporting secondary air distribution coefficient from described secondary air distribution controller 102, described secondary air distribution coefficient is used for from the secondary air distribution amount of motion tracking.
(2) when described secondary air distribution controller 102 is in auto state.
Secondary air distribution coefficients calculation block 110, for foundation H
2s/SO
2ratio deviation and the parameter value of described secondary air distribution controller 102, calculate correction and obtain secondary air distribution coefficient, make H
2s/SO
2ratio deviation is in presetting range.
Wherein, described H
2s/SO
2ratio deviation can be described H
2s/SO
2the set(ting)value of ratio and the difference of observed value.Described H
2s/SO
2ratio deviation and sour gas in hydrogen sulfide content changes, the disturbance of hydrocarbon impurities content has corresponding relation.
Now, described secondary air distribution coefficients calculation block 110 achieves the automatic adjustment of secondary air distribution coefficient to oxygen consumption composition transfer in sour gas.
Secondary air distribution follows the tracks of computing module 112, for the observed value according to described secondary air distribution coefficient and described sour gas flow, calculates secondary air distribution optimization setting value, and described secondary air distribution optimization setting value is inputed in described real-time data base 104.
Now, described secondary air distribution is followed the tracks of computing module 112 and is achieved secondary air distribution coefficient to the real-time follow-up of sour gas flow.
Three, main air distribution controller control module can be made up of main air distribution coefficients calculation block 114, main air distribution tracking computing module 116.
Main air distribution controller 100 obtains whole parameter values of described main air distribution controller 100 from described real-time data base 104.
According to the difference of the state of described main air distribution controller 100, described main air distribution coefficients calculation block 114 can be divided into two kinds of operating mode:
(1) when described main air distribution controller 100 is in manual mode.
Main air distribution coefficients calculation block 114, for exporting main air distribution coefficient from described main air distribution controller 100, described main air distribution coefficient is used for from the main air distribution amount of motion tracking.
(2) when described main air distribution controller 100 is in auto state.
Main air distribution coefficients calculation block 114, for the observed value according to described secondary air distribution, calculates correction and obtains main air distribution coefficient.
Described main air distribution coefficients calculation block 114 adjusts main air distribution coefficient, and secondary air distribution coefficient is operated in rational scope.Now, main air distribution coefficients calculation block 114 achieves two objects, and one is that secondary air distribution coefficient is operated in suitable range ability, ensures that secondary air distribution controller plays the best use of; Two is drifts of self-adaptation operating mode, such as, in the sour gas slow change of hydrogen sulfide content, hydrocarbon impurities content etc.
Main air distribution follows the tracks of computing module 116, for the observed value according to described main air distribution coefficient and described sour gas flow, calculates the optimization setting value of main air distribution, and the optimization setting value of described main air distribution is inputed to described real-time data base 104.
Now, described main air distribution is followed the tracks of computing module 116 and is achieved the real-time follow-up of main air distribution to sour gas flow.
Four, data outputting module can be made up of major-minor air distribution set(ting)value output module 118.
Major-minor air distribution set(ting)value output module 118, for the optimization setting value of the optimization setting value and described secondary air distribution that obtain described main air distribution from described real-time data base 104, and deliver to described DCS, with by described DCS according to the optimization setting value of the optimization setting value of described main air distribution and described secondary air distribution to described H
2s/SO
2ratio controls.
In sum, described system is receiving course parameter from DCS, through computing, obtains control data, then gives DCS, realizes the control to process by DCS.
The target of described system is: control the air quantity entering burner for producing sulfur, make the H in three grades of condensate cooler exit procedure gas
2s/SO
2=2/1.
Realize this target, then the H in furnace exit, one-level secondary reformer
2s/SO
2be 2/1 than all, this is the optimum reaction condition of burner for producing sulfur, one-level convertor, secondary reformer.Reach this condition, the sulphur content in sulphur tail gas processed can be made minimum, thus reduce the load of follow-up tail gas hydrogenation treating part, the final sulphur content reducing the emptying flue gas of device, has significant economic benefit and social benefit.
And, to H
2s/SO
2the control of ratio realizes primarily of secondary air distribution amount, and main air distribution amount mainly realizes the tracking to sour gas flow, but tracking ratio adjusts in real time according to the judgement of system to operating mode.Major and minor air distribution amount cooperatively interacts, and emphasizes particularly on different fields again, and common reply causes H
2s/SO
2the various interference of ratio change.
When Controlling System is normally run, send to DCS mono-WDT, judge the unforeseen circumstances such as deadlock, power down of Controlling System for DCS.If there is this type of situation, the automatic switchback DCS of system controls, and maintains basic running status.
Described Controlling System is to H
2s/SO
2the key that ratio carries out controlling has following 4 points:
1, major and minor air distribution all participates in the tracking to sour gas flow
A lot of control program only realizes the tracking to sour gas flow by main air distribution, and this is a very large defect, considerably beyond H
2s/SO
2ratio is to the insensitive scope of air distribution.Operate in theory and from actual motion, even if major-minor air distribution range ratio is 10/1, the tracking of secondary air distribution also can not be ignored far away.
2, secondary air distribution tackles other interference
From sour gas, the interference such as hydrogen sulfide content change, hydrocarbon impurities content, ammonia content change is to H
2s/SO
2the mechanism of the impact of ratio is seen, these interference can be summed up as a class.These interference all cause institute's oxygen consumed tolerance change.These interference are difficult to detect in advance, can only to H
2s/SO
2after ratio has an impact, just can adjust.This kind of interference is tackled in time by secondary air distribution.
3, at any time, the main air distribution of adjustment follows the tracks of ratio automatically
At any time, the main air distribution of adjustment follows the tracks of ratio automatically, realize two objects, one is try hard to secondary air distribution is operated in 40-60% range ability, ensures that secondary air distribution plays the best use of, two is drifts of self-adaptation operating mode, such as, in the sour gas slow change of hydrogen sulfide content, hydrocarbon impurities content etc.
4, high robust, height come into operation rate
Calculate the process revising major and minor air distribution coefficient and have employed the algorithm with very high robust, come into operation once debugging, just can adapt to most operating mode.A whole set of algorithm by multiple performance suboptimum but the high algorithm of robustness form.The height that this guarantees system comes into operation rate.
Above 4 points, ensure that the height of system comes into operation rate and overall high-performance.
Emptying flue gas SO before in September, 2009 project implementation in May ,-2010
2the real data of content is in table 1.
Table 1: emptying flue gas SO before the project implementation
2content
| Datedrawn | Sampled value (mg/m 3） |
| 2009.9.4 | 915 |
| 9.11 | 746 |
| 9.18 | 846 |
| 9.25 | 301 |
| 9.27 | 41 |
| 10.22 | 779 |
| 10.29 | 596 |
| 11.13 | 576 |
| 11.19 | 436 |
| 11.24 | 510 |
| 2009.12.17 | 590 |
| 12.24 | 636 |
| 12.28 | 542 |
| 2010.1.7 | 642 |
| 1.10 | 564 |
| 1.21 | 492 |
| 1.28 | 546 |
| 2010.2.3 | 576 |
| 2.11 | 475 |
| 2.26 | 626 |
| 2010.3.4 | 684 |
| 3.8 | 596 |
| 3.19 | 721 |
| 3.23 | 614 |
| 2010.4.2 | 815 |
| 4.8 | 746 |
| 4.15 | 874 |
| 4.23 | 766 |
| 4.26 | 793 |
| 2010.5.4 | 736 |
| 5.14 | 710 |
| 5.20 | 729 |
| 5.28 | 642 |
| Mean value | 651 |
Emptying flue gas SO after the 8-9 month project implementation in 2010
2the real data of content is in table 2.
Table 2: flue gas SO after the project implementation
2content
| Datedrawn | Sampled value (mg/m 3） |
| 2010.8.5 | 469 |
| 8.11 | 521 |
| 8.20 | 569 |
| 8.31 | 490 |
| 9.8 | 577 |
| 9.10 | 544 |
| 9.20 | 504 |
| 9.29 | 510 |
| Mean value | 523 |
According to table 1, table 2, analytical results is summarized as follows:
In May ,-2010 in September, 2009, emptying flue gas SO
2content samples 33 altogether, and wherein on September 27th, 2009, sampled value was 41, obviously unreasonable, and after rejecting, all the other 32 sample mean values are 651mg/m
3;
The 8-9 month in 2010, emptying flue gas SO
2content samples 8 altogether, and mean value is 523mg/m
3.
Namely after implementing this project, emptying flue gas SO
2content reduces 651-523=128 mg/m
3, the range of decrease is 128/651=19.6%.
The above is only preferred implementation of the present utility model; should be understood that; for those skilled in the art; under the prerequisite not departing from the utility model know-why; can also make some improvement and replacement, these improve and replace and also should be considered as protection domain of the present utility model.
Claims (1)
1. a sulfur recovery facility H
2s/SO
2ratio control system, is characterized in that, described system is connected with dcs DCS, and described system comprises main air distribution controller, secondary air distribution controller and real-time data base; Described system also comprises:
Process parameter load module, for obtaining H from DCS
2s/SO
2the set(ting)value of ratio and observed value, acid gas stream measurement, main air distribution measurement, secondary air distribution measurement, and deliver in described real-time data base;
Controling parameters acquisition module, for the parameter value of the parameter value and secondary air distribution controller that input described main air distribution controller to described real-time data base;
Main air distribution controller and secondary air distribution controller obtain whole parameter value of described main air distribution controller and whole parameter values of described secondary air distribution controller from described real-time data base; The state of described main air distribution controller comprises manual mode and auto state; The state of described secondary air distribution controller comprises manual mode and auto state;
Secondary air distribution coefficients calculation block, for when described secondary air distribution controller is in manual mode, exports secondary air distribution coefficient, and this secondary air distribution coefficient is from the secondary air distribution amount of motion tracking; When described secondary air distribution controller is in auto state, according to H
2s/SO
2ratio deviation and the parameter value of described secondary air distribution controller, calculate and revise secondary air distribution coefficient, make H
2s/SO
2ratio deviation is in presetting range; Wherein, described H
2s/SO
2ratio deviation be described H
2s/SO
2the set(ting)value of ratio and the difference of observed value; Described H
2s/SO
2ratio deviation and sour gas in hydrogen sulfide content changes, the disturbance of hydrocarbon impurities content has corresponding relation;
Secondary air distribution follows the tracks of computing module, for the observed value according to described secondary air distribution coefficient and described sour gas flow, calculates secondary air distribution optimization setting value, and inputs in described real-time data base by described secondary air distribution optimization setting value;
Main air distribution coefficients calculation block, for when described main air distribution controller is in manual mode, export main air distribution coefficient, this main air distribution coefficient is from the main air distribution amount of motion tracking; When described main air distribution controller is in auto state, according to the observed value of described secondary air distribution, calculate correction and obtain main air distribution coefficient;
Main air distribution follows the tracks of computing module, for the observed value according to described main air distribution coefficient and described sour gas flow, calculates the optimization setting value of main air distribution, and the optimization setting value of described main air distribution is inputed to described real-time data base;
Major-minor air distribution set(ting)value output module, for the optimization setting value of the optimization setting value and described secondary air distribution that obtain described main air distribution from described real-time data base, and deliver to described DCS, with by described DCS according to the optimization setting value of the optimization setting value of described main air distribution and described secondary air distribution to described H
2s/SO
2ratio controls.
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|---|---|---|---|
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|---|---|---|---|
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104150448A (en) * | 2014-07-22 | 2014-11-19 | 北京华创睿控科技有限公司 | H2S/SO2 ratio control system of sulfur recovery device |
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2014
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104150448A (en) * | 2014-07-22 | 2014-11-19 | 北京华创睿控科技有限公司 | H2S/SO2 ratio control system of sulfur recovery device |
| CN104150448B (en) * | 2014-07-22 | 2016-03-30 | 北京华创睿控科技有限公司 | A kind of sulfur recovery facility H 2s/SO 2ratio control system |
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|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20141217 Effective date of abandoning: 20160330 |
|
| C25 | Abandonment of patent right or utility model to avoid double patenting |