CN101337133A - Reflux-ratio temperature automatic control device and method of fractionating tower - Google Patents
Reflux-ratio temperature automatic control device and method of fractionating tower Download PDFInfo
- Publication number
- CN101337133A CN101337133A CNA2008100416897A CN200810041689A CN101337133A CN 101337133 A CN101337133 A CN 101337133A CN A2008100416897 A CNA2008100416897 A CN A2008100416897A CN 200810041689 A CN200810041689 A CN 200810041689A CN 101337133 A CN101337133 A CN 101337133A
- Authority
- CN
- China
- Prior art keywords
- time relay
- reflux
- control
- feed temperature
- temperature
- 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
- Vaporization, Distillation, Condensation, Sublimation, And Cold Traps (AREA)
Abstract
The present invention discloses an automatic control device and method of reflux ratio temperature controlling in a distillation tower. The automatic control device includes a reflux time relay that controls the open and close state of a reflux passage, a distillation time relay that controls the open and close state of a distillation passage, an acquisition unit and a control unit. The control unit sets the range of feed temperature and sets the controlling time of the relays according to the reflux ratio, in this way, the said reflux passage and distillation passage are opened according to the reflux ratio if the acquired feed temperature is within the preset range, otherwise, only the said backflow passage is opened to realize a total reflux. In addition, according to the above mentioned characteristics, the present invention can realize accurate distillation cut operation of the microflow product at the top of the distillation tower during the intermittent rectification process by virtue of setting the feed temperature range.
Description
Technical field
The present invention relates to the distillation field of chemical industry, more particularly, relate to a kind of reflux-ratio temperature automatic control device and method of rectifying column.
Background technology
Distillation operation in the chemical industry is one of important operation of Chemical Manufacture.In the distillation operation process, according to the composition of material liquid and to the factors such as concrete composition requirement of raffinate and product, the operating parameter of decision rectifying column, in batch fractionating or continuous rectification operating process, often need be by adjusting the operating parameter that reflux ratio realizes rectifying column.The ratio of capacity of returns and quantum of output is called reflux ratio in rectifying column, if quantum of output be zero (also claim infinite reflux〉then reflux ratio is for infinitely great, in practical operation, often will be by calculating the suitable reflux ratio of decision.
For the control of rectifying column micrometeor reflux ratio, prior art is to lean on the simple cooperation of an electromagnet and the two-digit time relay to realize.Give access and disconnection that this two-digit time relay relay time controls power supply and electromagnet, make electromagnet produce the action that electromagnetism is inhaled and the generation loss of excitation is put after outage after the energising, in order to the outflow direction of realization rectifying tower top micrometeor distillate and the backflow direction of phegma.Realize the action that electromagnet is inhaled, put with the relay time length of setting this time relay, and the action of this group digital time relay and electromagnet and rectifying tower top steam feed temperature and have nothing to do.Therefore when the temperature that steams feed liquid when rectifying tower top changed, prior art was then powerless, can influence the quality requirement of rectifying tower top distillate thus.
Summary of the invention
On the one hand, the object of the present invention is to provide a kind of reflux-ratio temperature automatic control device of rectifying column, comprise the return time relay that the control return flow line opens and closes and control the time relay that distillates that distillates passage switching, also comprise:
Collecting unit is gathered the feed temperature data of described rectifying tower top;
Control module, connect described collecting unit, be suitable for setting the feed temperature scope of described rectifying tower top, according to feed temperature scope of setting and predetermined reflux ratio, according to predetermined rule to described return time relay, distillate the time relay and carry out time control.
Performance element with described return time relay, distillate the time relay and be connected, is carried out described control return flow line and control and is distillated passage switching.
Described collecting unit comprises Temperature Detector, and described Temperature Detector is gathered the feed temperature data of described rectifying tower top and imported described control module.
Described control module is provided with described return time relay according to predetermined reflux ratio and distillates the control time of the time relay, when the feed temperature scope of the feed temperature of gathering in described setting, according to the control time that is provided with to described return time relay with distillate the time relay and control and then open described return flow line and distillate passage, when the feed temperature of gathering not in the feed temperature scope of described setting, only open described return flow line.
Described control module comprises intelligent regulator, the feed temperature data that described intelligent regulator comparison is gathered and the feed temperature data of setting, and regulate feed temperature in real time within described setting range.
Described performance element comprises electromagnet and miniflow buret, described electromagnet with described return time relay, distillate the time relay and be connected, described miniflow buret connects described control return flow line and control distillates passage, with the flow direction of control phegma and distillate.
On the other hand, the present invention also provides a kind of reflux-ratio temperature autocontrol method of rectifying column, comprises the return time relay is connected on the return flow line to control its switching, will distillate the time relay and be connected and distillate on the passage to control its switching, also comprises:
Set the feed temperature scope and the reflux ratio of described rectifying tower top, and described return time relay and the control time that distillates the time relay are set according to described reflux ratio;
Gather the feed temperature data of described rectifying tower top;
Whether the feed temperature of judge gathering is in the feed temperature scope of described setting, if in scope then according to the control time that described return time relay is set and distillates the time relay to described return time relay with distillate the time relay and control and then open described return flow line and distillate passage, if in scope, then only do not open described return flow line.
The feed temperature data of described collection rectifying tower top are finished collection by Temperature Detector.
Described autocontrol method also comprises to be regulated the intelligence of temperature, the feed temperature data that comparison is gathered and the feed temperature data of setting, and regulate feed temperature in real time within described setting range.
Adopt the reflux-ratio temperature automatic control device and the method for a kind of rectifying column of the present invention, because method of the present invention and device have adopted Temperature Detector to gather the feed temperature of rectifying tower top, and adopted intelligent regulator to control described return time relay and distillated the time relay, steam the variation of feed temperature like this according to rectifying tower top, realization is to return flow line and the automatic control that distillates passage, if in range of set temperature, then open described return flow line and distillate passage according to reflux ratio, if in scope, then only do not open described return flow line, realize infinite reflux.In addition, according to These characteristics, the present invention can realize fraction cutting operation accurately to the product of rectifying tower top micrometeor in the distillation process of gap, promptly in obtaining first temperature range after the overhead distillate, can under the condition that existing stable rectifying column is operated, accurately obtain overhead distillate product in second temperature range as long as change intelligent regulator range of set temperature and reflux ratio condition, by that analogy, then can obtain product fraction under the required all temps condition of rectification process.
Description of drawings
Fig. 1 is the principle schematic of reflux-ratio temperature automatic control device of the present invention;
Fig. 2 is the schematic flow sheet of reflux-ratio temperature autocontrol method of the present invention;
Fig. 3 is the principle schematic of intelligent regulator of the present invention;
Fig. 4 is the time control waveform figure of control module of the present invention.
The specific embodiment
Further specify technical scheme of the present invention below in conjunction with drawings and Examples.
With reference to figure 1, on the one hand, the present invention is a kind of reflux-ratio temperature automatic control device of rectifying column, comprising:
Return time relay 201, connect the return flow line 2051 of rectifying column and control its switching, distillate the time relay 202, connect distillating passage 2052 and controlling its switching of rectifying column, described return flow line 2051 is opened and is just meaned that rectifying column begins to reflux, and the described passage 2052 that distillates is opened and just meaned that rectifying column has had quantum of output.
Collecting unit 203 is gathered the feed temperature data of described rectifying tower top.Described collecting unit comprises Temperature Detector, and described Temperature Detector is gathered the feed temperature data of described rectifying tower top and imported described control module 204.As an embodiment, described Temperature Detector can be thermal resistance.
Control module 204, connect described collecting unit 203, according to an embodiment, control module 204 can comprise intelligent regulator, can set the feed temperature scope of described rectifying tower top by intelligent regulator, intelligent regulator is provided with described return time relay and the control time that distillates the time relay (the control time ratio of two relays identical or approach reflux ratio) according to predetermined reflux ratio.
Performance element 205, comprise electromagnet and miniflow buret, described electromagnet with described return time relay, distillate the time relay and be connected, described miniflow buret connects described control return flow line 2051 and control distillates passage 2052, with the flow direction of control phegma and distillate.
When control module 204 is judged the feed temperature scope of the feed temperature of collection in described setting, according to the control time that is provided with to described return time relay with distillate the time relay and control and then open described return flow line 2051 and distillate passage 2052, produce capacity of returns and quantum of output in the rectifying column; And when the feed temperature of gathering not in the feed temperature scope of described setting, intelligent regulator is only controlled and is opened described return flow line 2051, rectifying column is in the infinite reflux state so at this moment.Specifically, feed liquid flows out from the miniflow buret from top to bottom, and the micrometeor pipe hanger can swing on an axle center, and just as a pendulum, its swing is determined that by electromagnet when electromagnet energising generation suction, the miniflow buret is flapped toward and slips out passage 2052 directions; When electromagnet outage loss of excitation, the miniflow buret is returned former return flow line 2051 directions.As an embodiment, described intelligent regulator can be a degeneration factor, can compare the feed temperature data of collection and the feed temperature data of setting, and for the deviation that exists, intelligent regulator is regulated feed temperature in real time within described setting range.Referring to Fig. 3, Fig. 3 is the principle schematic of intelligent regulator, when controlled parameter X o is interfered or during disturbance, has produced deviation ε between controlled parameter X o and the set-point Xs:
ε＝Xi-Xs
Wherein: the Xs--set-point;
The Xi--measured value;
The controlled parameter value of Xo--;
ε--deviation;
The output signal of y--intelligent regulator.
After intelligent regulator receives deviation signal, output control signal (0～10mA, 4～10mA or switching signal) y acts on controlled device by certain calculation rule (such as PID or position formula computing, amplification), in order to eliminate the influence (eliminate deviate ε) of disturbance, make controlled parameter X o revert to the set-point Xs of institute and go up controlled parameter.
With reference to figure 2, on the other hand, the present invention also provides a kind of reflux-ratio temperature autocontrol method of rectifying column, comprising:
101, relay is connected between intelligent regulator and the electromagnet, to control the return flow line and to distillate passage.
The return time relay is connected on the return flow line to control its switching, will distillates the time relay and be connected and distillate on the passage to control its switching.
102, set feed temperature scope and reflux ratio, and the control time of the time relay is set.
Set the feed temperature scope and the needed reflux ratio of described rectifying tower top, and described return time relay and the control time that distillates the time relay (the control time ratio of two relays identical or approach reflux ratio) are set according to described reflux ratio.
With reference to figure 4, definite process of reflux ratio is as follows:
A, t=11 second conduction time, electromagnet produces attraction, and the miniflow buret is inhaled to the right, and the feed liquid trend distillates passage;
B, power-off time T=3 second, electromagnet dead electricity and loss of excitation, miniflow buret return-to-home position, feed liquid is moved towards the return flow line;
This moment, reflux ratio was: the amount that feed liquid is walked in the amount of feed liquid/3 second in 11 seconds, both ratio is 3.67.
When feed temperature in control range, then automaton repeats the action of a and b.
103, gather described feed temperature data.
Gather the feed temperature data of described rectifying tower top, can finish collection by Temperature Detector, Temperature Detector can be selected thermal resistance.
104, comparison temperature and the time relay controlled.
When the feed temperature scope of the feed temperature of gathering in described setting, according to the control time that is provided with to described return time relay with distillate the time relay and control and then open described return flow line and distillate passage, produce capacity of returns and quantum of output in the rectifying column; And when the feed temperature of gathering not in the feed temperature scope of described setting, intelligent regulator is only controlled and is opened described return flow line, rectifying column is in the infinite reflux state so at this moment.
As an embodiment, described autocontrol method also comprises to be regulated the intelligence of temperature, can realize by intelligent regulator, and the feed temperature data that comparison is gathered and the feed temperature data of setting, and regulate feed temperature in real time within described setting range.Specifically see above.
Specify the course of work of reflux-ratio temperature automatic control device of the present invention and method below by an embodiment:
At first described return time relay and distillate the time relay to have selected time parameter be 1～99 second model, cat head micrometeor distillate temperature requirement in first temperature range is controlled at 64.5 ℃～64.9 ℃, reflux ratio is 3.77, and required component content is 99.5% in the corresponding distillate.So setting the intelligent regulator temperature range is 64.5 ℃～64.9 ℃, in this scope, carry out reflux ratio operation to setting, outside this scope, carry out total reflux operation.
Requirement according to reflux ratio R=3.77 (≈ 4), if the relay time of digital time relay A (backflow) is 11 (or 4) seconds, the relay time of digital time relay B (distillating) is 3 (1) seconds, and this can obtain L=3.67 (≈ 4) D is that capacity of returns is distillate 3.67 (or 4) operation doubly.Temperature conditions is operated the quality control index that resulting rectifying tower top micrometeor distillate composition content has reached technology, i.e. required component content 〉=99.5% in the distillate down thus.
For the gap distillation operation, after fraction in first temperature range has cut immediately to the setting of overhead distillate temperature and reflux ratio in second temperature range, the temperature range that set intelligent regulator this moment is 64.9 ℃～65.3 ℃, in this scope, carry out the reflux ratio operation, if under the constant situation of reflux ratio condition, required component content is 98.5% in the resulting corresponding distillate.This can obtain product fraction in second temperature range to carry out total reflux operation outside this scope.Can analogize according to this.
Precise control of the present invention in practical operation, the precision height, effect is remarkable, both guaranteed that the rectifying column overhead distillate was according to the temperature of setting and the processing quality of reflux ratio institute extraction, also guaranteed in stablizing distillation operation accurate cutting to fraction, in rectification process to the micrometeor reflux-ratio temperature automatically control have using value.
Those of ordinary skill in the art will be appreciated that, above embodiment is used for illustrating the present invention, and be not to be used as limitation of the invention, as long as in connotation scope of the present invention, all will drop in claims scope of the present invention variation, the modification of above embodiment.
Claims (8)
1, a kind of reflux-ratio temperature automatic control device of rectifying column comprises the return time relay that the control return flow line opens and closes and controls the time relay that distillates that distillates passage switching, it is characterized in that, also comprises:
Collecting unit is gathered the feed temperature data of described rectifying tower top;
Control module, connect described collecting unit, be suitable for setting the feed temperature scope of described rectifying tower top, according to feed temperature scope of setting and predetermined reflux ratio, according to predetermined rule to described return time relay, distillate the time relay and carry out time control;
Performance element with described return time relay, distillate the time relay and be connected, is carried out described control return flow line and control and is distillated passage switching.
2, reflux-ratio temperature automatic control device as claimed in claim 1 is characterized in that, described collecting unit comprises Temperature Detector, and described Temperature Detector is gathered the feed temperature data of described rectifying tower top and imported described control module.
3, reflux-ratio temperature automatic control device as claimed in claim 1, it is characterized in that, described control module is provided with described return time relay according to predetermined reflux ratio and distillates the control time of the time relay, when the feed temperature scope of the feed temperature of gathering in described setting, according to the control time that is provided with to described return time relay with distillate the time relay and control and then open described return flow line and distillate passage, when the feed temperature of gathering not in the feed temperature scope of described setting, only open described return flow line.
4, as claim 1 or 3 described reflux-ratio temperature automatic control devices, it is characterized in that, described performance element comprises electromagnet and miniflow buret, described electromagnet with described return time relay, distillate the time relay and be connected, described miniflow buret connects described control return flow line and control distillates passage, with the flow direction of control phegma and distillate.
5, reflux-ratio temperature automatic control device as claimed in claim 4, it is characterized in that, described control module comprises intelligent regulator, the feed temperature data that described intelligent regulator comparison is gathered and the feed temperature data of setting, and regulate feed temperature in real time within described setting range.
6, a kind of reflux-ratio temperature autocontrol method of rectifying column comprises the return time relay is connected on the return flow line to control its switching, will distillate the time relay and be connected and distillate on the passage to control its switching, it is characterized in that, also comprises:
Set the feed temperature scope and the reflux ratio of described rectifying tower top, and described return time relay and the control time that distillates the time relay are set according to described reflux ratio;
Gather the feed temperature data of described rectifying tower top;
Whether the feed temperature of judge gathering is in the feed temperature scope of described setting, if in scope then according to the control time that described return time relay is set and distillates the time relay to described return time relay with distillate the time relay and control and then open described return flow line and distillate passage, if in scope, then only do not open described return flow line.
7, reflux-ratio temperature autocontrol method as claimed in claim 6 is characterized in that, the feed temperature data of described collection rectifying tower top are finished collection by Temperature Detector.
8, reflux-ratio temperature autocontrol method as claimed in claim 6, it is characterized in that, described autocontrol method also comprises to be regulated the intelligence of temperature, the feed temperature data that comparison is gathered and the feed temperature data of setting, and regulate feed temperature in real time within described setting range.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008100416897A CN101337133B (en) | 2008-08-14 | 2008-08-14 | Reflux-ratio temperature automatic control device and method of fractionating tower |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008100416897A CN101337133B (en) | 2008-08-14 | 2008-08-14 | Reflux-ratio temperature automatic control device and method of fractionating tower |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101337133A true CN101337133A (en) | 2009-01-07 |
| CN101337133B CN101337133B (en) | 2011-04-06 |
Family
ID=40211395
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2008100416897A Active CN101337133B (en) | 2008-08-14 | 2008-08-14 | Reflux-ratio temperature automatic control device and method of fractionating tower |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101337133B (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102631791A (en) * | 2012-03-31 | 2012-08-15 | 中国石油化工股份有限公司 | Method for controlling dividing-wall distillation column |
| CN103893988A (en) * | 2014-04-10 | 2014-07-02 | 河南心连心化肥有限公司 | Automatic pressure stabilizing control device for steam of methanol distillation system and control method of control device |
| CN104277859A (en) * | 2013-07-09 | 2015-01-14 | 中国石油化工股份有限公司 | Separation method of Fischer-Tropsch reaction products |
| CN106334330A (en) * | 2016-09-28 | 2017-01-18 | 唐山钢铁集团有限责任公司 | Method for automatically adjusting and controlling tower top temperature of distillation tower |
| CN107096252A (en) * | 2017-05-04 | 2017-08-29 | 万华化学集团股份有限公司 | The method that rectifying column tower top cold is automatically controlled |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4402499C1 (en) * | 1994-01-28 | 1995-04-27 | Boewe Passat Reinigung | Process and apparatus for distilling a contaminated hydrocarbon solvent liquor |
| EP0696465A1 (en) * | 1994-08-09 | 1996-02-14 | Richard Wengert | Process and discharge assembly for the separation of alcohol-water-mixtures |
| US6638397B1 (en) * | 1995-12-05 | 2003-10-28 | Cbg Biotech, Ltd. | Simplified automated distillation system for recovering a solvent from a liquid mixture |
| CN100346856C (en) * | 2005-10-14 | 2007-11-07 | 清华大学 | Rectification tower automatic control and optimization method |
| CN1962015B (en) * | 2006-10-30 | 2010-04-21 | 浙江大学 | Dynamic matrix control system and method for high-purity distillation |
-
2008
- 2008-08-14 CN CN2008100416897A patent/CN101337133B/en active Active
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102631791A (en) * | 2012-03-31 | 2012-08-15 | 中国石油化工股份有限公司 | Method for controlling dividing-wall distillation column |
| CN102631791B (en) * | 2012-03-31 | 2016-03-09 | 中国石油化工股份有限公司 | A kind of control method of rectifying tower with bulkhead |
| CN104277859A (en) * | 2013-07-09 | 2015-01-14 | 中国石油化工股份有限公司 | Separation method of Fischer-Tropsch reaction products |
| CN104277859B (en) * | 2013-07-09 | 2017-04-19 | 中国石油化工股份有限公司 | Separation method of Fischer-Tropsch reaction products |
| CN103893988A (en) * | 2014-04-10 | 2014-07-02 | 河南心连心化肥有限公司 | Automatic pressure stabilizing control device for steam of methanol distillation system and control method of control device |
| CN103893988B (en) * | 2014-04-10 | 2015-09-23 | 河南心连心化肥有限公司 | Methanol fractionation system steam automatic voltage stabilization and control device and control method thereof |
| CN106334330A (en) * | 2016-09-28 | 2017-01-18 | 唐山钢铁集团有限责任公司 | Method for automatically adjusting and controlling tower top temperature of distillation tower |
| CN106334330B (en) * | 2016-09-28 | 2018-11-09 | 唐山钢铁集团有限责任公司 | Overhead temperature automatic adjustment control method |
| CN107096252A (en) * | 2017-05-04 | 2017-08-29 | 万华化学集团股份有限公司 | The method that rectifying column tower top cold is automatically controlled |
| CN107096252B (en) * | 2017-05-04 | 2019-06-07 | 万华化学集团股份有限公司 | The method that the top of the distillation column cooling capacity automatically controls |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101337133B (en) | 2011-04-06 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101337133B (en) | Reflux-ratio temperature automatic control device and method of fractionating tower | |
| CN103299076A (en) | Method for operating a pump that is driven by an electric motor in a power-optimized manner in the event of low volumetric flow rates | |
| CN100569416C (en) | A kind of constant fluid level control device of fused mass box for casting | |
| CN102183892B (en) | Load change energy consumption optimizing control method of three-column methanol distillation system | |
| CN112295255B (en) | Intelligent control system and control method for methanol rectification device | |
| CN102736640A (en) | System and method for controlling water level of deaerator | |
| CN105278352A (en) | Oil field water injection automatic control system and method thereof | |
| Nielsen et al. | Driving force based design of cyclic distillation | |
| CN105656372A (en) | Direct-current speed regulation system where prediction PI algorithm and combined integral link are combined | |
| CN103742706B (en) | A kind of electroheating type flow quantity intelligent regulates valve and control method thereof | |
| CN1327306C (en) | Online optimized method for blending oil products, and system of implementing the method | |
| CN205894036U (en) | Intelligence weir door | |
| CN205478243U (en) | Energy -saving air compression station control system of unmanned on duty formula | |
| CN107320992A (en) | A kind of distilling apparatus and distillation control method | |
| CN101667045B (en) | Intelligent synergetic controller of carbon fiber coagulation bath and method thereof | |
| CN209060584U (en) | Rectifying column overall process automatic control device and system | |
| CN113617216B (en) | Integrated control method and system for wet desulfurization absorption tower system | |
| CN201933468U (en) | High-precision electronic proportional speed regulation automatic control system of hydraulic hoist | |
| CN104896953B (en) | The control method of cement-kiln grate-cooler and system | |
| CN1962014A (en) | High-purity distillation general model control system and method | |
| CN204065899U (en) | A kind of intelligent heating oil well two close cycles intermediate frequency power supply | |
| CN202850126U (en) | Water level control system | |
| CN103614156A (en) | Automatic control system for viscosity reduction of thickened oil and control method thereof | |
| CN206157470U (en) | Reconstituted tobacco non -contact coating machine | |
| CN103105869A (en) | Three-tank single-loop liquid level system |
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 |