CN107837553A - The method of controlling operation thereof of divided wall column - Google Patents
The method of controlling operation thereof of divided wall column Download PDFInfo
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- CN107837553A CN107837553A CN201610831423.7A CN201610831423A CN107837553A CN 107837553 A CN107837553 A CN 107837553A CN 201610831423 A CN201610831423 A CN 201610831423A CN 107837553 A CN107837553 A CN 107837553A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D3/00—Distillation or related exchange processes in which liquids are contacted with gaseous media, e.g. stripping
- B01D3/14—Fractional distillation or use of a fractionation or rectification column
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D3/00—Distillation or related exchange processes in which liquids are contacted with gaseous media, e.g. stripping
- B01D3/42—Regulation; Control
Abstract
The present invention relates to a kind of method of controlling operation thereof of divided wall column, mainly solve that conventional divided wall column operational control is difficult, stability is bad and product quality and the uppity technical problem of yield.The present invention is by using to five control areas of divided wall column：Feedstock control area, overhead reflux and extraction control area, liquid are collected and distribution control area, side take-off control area and tower reactor produce the technical scheme that temperature, flow and liquid level in control area are controlled and preferably solve above-mentioned technical problem, available in the industrial production of divided wall column.
Description
Technical field
The present invention relates to a kind of method of controlling operation thereof of divided wall column, available in the industrial production of divided wall column.
Background technology
Rectifying is most ripe, most widely used a kind of isolation technics in petrochemical industry production, but distillation process energy consumption is huge
Greatly, it is estimated that, 40~70% energy consumption is used to separate in chemical process, and energy consumption of rectification accounts for therein 95%.In order to reduce essence
The energy consumption of process is evaporated, researcher both domestic and external is conducted extensive research, and divided wall column is set as a kind of typical Finestill energy-saving
Standby or process intensification power-saving technology is of great interest.
Divided wall column is by installing the vertical partition plate of one or more certain length or with inclination angle in a rectifying column
The dividing plate of degree, using a set of vaporization and condensation system, while the product of isolated three kinds or more.Due to only having a set of vapour
Change condenser system, and avoid and remixed using intermediate species during multitower rectifying, therefore bulkhead distillation technology is than traditional
Distillation technology investment reduction 20~30%, energy consumption reduce by 20~40%.
In fact, most early in nineteen thirty, Eeic W.Luster (US1915681) are just because the separation of cracking gas proposes point
The concept of wall tower, but until 1985 First divided wall column (BASF) just put into industrial production, so far also only have more than 200 bulkhead
Tower is in commercial Application, it is difficult to is widely popularized, basic reason therein is in addition to lacking reliable structure design, divided wall column
Larger difficulty be present in operation and control aspect is also the crucial point that can not be ignored.
By taking the divided wall column for being most commonly used for three components separation as an example, dividing plate is axially placed along tower, by divided wall column be divided into every
The public stripping section below public rectifying section, dividing plate more than plate, and the bulkhead section where dividing plate, according to charging and middle groups
Divide the difference of extraction, bulkhead section is divided into feed side and product side again.Therefore, compared with conventional rectification tower, divided wall column is tied due to it
The particularity of structure, the free degree is more, except with conventional rectification tower identical technological parameter, such as operating pressure, cooling and heating load, backflow
Than, product produced quantity etc., extraction and the distribution condition of dividing plate both sides gas phase and liquid phase of the divided wall column also including sideline product, and
And highly coupled between above-mentioned technological parameter, change it is therein any one can bring direct shadow to the operation of other specification
Ring, such as the change of overhead reflux liquid measure not only influences overhead product quality, also directly changes public rectifying section bottom distillate
The total amount of body, in the case of fixed both sides liquid phase distribution ratio, the distribution liquid measure of demarcation strip both sides is directly affected, and both sides are distributed
The change of liquid measure, and the pre-separation effect and the sideline product quality of product side that bulkhead section feeding side will be directly affected；If
Both sides distribution liquid measure fix in the case of, then the change of overhead reflux liquid measure will directly destruction tower in material balance, influence to pass
Matter, heat transfer and vapor liquid equilibrium process, therefore, height coupling and chain reaction in divided wall column between technological parameter can significantly affect point
The product quality of wall tower and stable operation control, and this is also exactly the immediate cause that divided wall column is difficult to stability contorting, is point
A research emphasis and difficult point for wall tower development process.
At present, the publication in terms of divided wall column operation and quality control is less, is disclosed in CN102631791A
A kind of control method of divided wall column, mainly in 3 control methods of E.A.Wolff et al. (Operation of integrated
three-product(Petlyuk)distillation columns,E.A.Wolff,S.Skogestad,
Ind.Eng.Chem.Res.,1995,34(6):2094-2103) on the basis of, a control loop has been increased newly, i.e., in adjusting tower
Push up capacity of returns control tower top product purity, regulation side take-off amount control sideline product purity, regulation tower reactor quantity of steam control tower
On the basis of kettle product purity, add and controlled by adjusting the liquid phase distribution ratio of bulkhead tower dividing plates both sides at the top of feed side
Rise the heavy constituent content in gas phase.Although it has all carried out corresponding control to product quality, tower top and tower reactor product go out
Doses does not control, each product yield including sideline product can not ensure, meanwhile, the liquid level in multiple regions in tower,
Such as overhead reflux region, public rectifying section bottom liquid is collected and distribution region, and control explanation is not done in tower reactor region, difficult
To ensure the material balance of divided wall column and stability contorting.
Obviously, control method of the prior art can not ensure to ensure product yield while product quality, can not realize
Stable operation, therefore, it is necessary to more efficiently method of controlling operation thereof is developed, to the numerous technological parameters or performance variable of divided wall column
Comprehensively controlled, realize the stable operation of divided wall column, while ensure the quality and yield of each product.
The content of the invention
It is to be solved by this invention be that divided wall column operational control in the prior art is difficult, stability is bad and product quality and
The uppity technical problem of yield.The invention provides a kind of method of controlling operation thereof of divided wall column, by divided wall column not
With the temperature in region, flow and Liquid level, comprehensive control of divided wall column is realized, both ensure that product quality, product yield,
Stability contorting is also achieved, available in the industrial production of divided wall column.
In order to solve the above-mentioned technical problem, the technical solution adopted by the present invention is as follows：Divided wall column includes 5 control areas,
Respectively：Feedstock control area, overhead reflux and extraction control area, liquid are collected and distribution control area, side line are adopted
Go out control area, and tower reactor produces control area, the control method of each control area is as follows：
(1) feedstock control area：Controlled using flow controller control feedstock amount, using temperature controller former
Expect feeding temperature；
(2) overhead reflux and extraction control area：Using flow controller control overhead product produced quantity, using flow control
Device processed controls tower top backflow volume, controls tower reactor reboiler heat using fluid level controller；
(3) control area is collected and distributed to liquid：Public rectifying section bottom is controlled to distillate liquid using fluid level controller
Flow, the distribution liquid measure using temperature controller control bulkhead section side；
(4) side take-off control area：Sideline product produced quantity is controlled using flow controller；
(5) tower reactor extraction control area：Tower reactor product produced quantity is controlled using fluid level controller.
In above-mentioned technical proposal, what the flow controller in feedstock control area controlled is feedstock amount, according to
The feedstock amount of setting automatically adjusts actual feedstock amount.
In above-mentioned technical proposal, what the temperature controller in feedstock control area controlled can be divided wall column bulkhead section
The temperature or the temperature of bulkhead section product side or public stripping section sensitive plate of feed side sensitive plate, and according to above-mentioned spirit
Quick plate temperature automatically adjusts feedstock temperature.
In above-mentioned technical proposal, 2 flow controllers are shared in overhead reflux and extraction control area, one of control
Be overhead product produced quantity, another control be top reflux flow rate；The former is according to feedstock amount and corresponded to light
Percentage composition of the component in feed composition carries out flow set, and the latter is then backflow according to needed for divided wall column when phase
The overhead product produced quantity answered carries out flow set, and two flow controllers automatically adjust reality according to respective setting value
Overhead product produced quantity and top reflux flow rate, the yield of overhead product had both been ensure that, further through ensureing tower top part
Reflux ratio is further ensured that the product quality of tower top.
In above-mentioned technical proposal, what the fluid level controller in overhead reflux and extraction control area controlled is return tank of top of the tower
Liquid level, tower reactor reboiler heat is automatically adjusted according to the liquid level, ensures the rising vapor volume of tower reactor.Due to overhead reflux and adopt
Go out and carried out corresponding control, therefore, realize the stabilization of return tank of top of the tower liquid level, being equal to realizes overhead reflux and extraction
The stable operation in region, while ensure that the material balance of light component in divided wall column.
In above-mentioned technical proposal, what the fluid level controller in liquid collection and distribution control area controlled is that divided wall column is public
The liquid level of rectifying section bottom liquid collecting zone, the total flow that bottom distillates liquid is automatically adjusted according to the liquid level.Due to separating
The liquid distribution of plate both sides directly affects the separating resulting of divided wall column, and above-mentioned distribution liquid comes from public rectifying section bottom
Liquid collection regions liquid, therefore, to the region carry out Liquid level, help avoid gas phase race material or liquid phase overflow
Stream, while ensure liquid distribution effects and the stable operation of divided wall column of bulkhead sides.
In above-mentioned technical proposal, what the temperature controller in liquid collection and distribution control area controlled can be divided wall column
The temperature or the temperature of bulkhead section product side or public stripping section sensitive plate of bulkhead section feeding side sensitive plate, and according to
Above-mentioned sensitive plate temperature automatic adjustment corresponds to the distribution liquid measure of side.When the temperature controller control in feedstock control area
Be the temperature of divided wall column bulkhead section feeding side sensitive plate when, then liquid collect and distribution control area in temperature controller control
What is made is exactly the temperature of bulkhead section product side or public stripping section sensitive plate；Temperature controller in feedstock control area
When what is controlled is the temperature of divided wall column bulkhead section product side or public stripping section sensitive plate, then control area is collected and distributed to liquid
In temperature controller control be exactly bulkhead section feeding side sensitive plate temperature.In divided wall column, on the one hand, due to feed side
Main function be the pre-separation for realizing raw material, i.e., part intermediate species with light component enter public rectifying section, remaining middle groups
Divide and enter public stripping section with heavy constituent, therefore, temperature control is carried out to bulkhead section feeding side, it is ensured that above-mentioned pre-separation effect
Fruit, effectively avoid heavy constituent from entering public rectifying section from the top of demarcation strip, and then enter product side in a manner of liquid phase, influence side
Line product quality；On the other hand, because the main function of product side is to realize that intermediate species efficiently separates with light, heavy constituent,
The main function of public stripping section is to realize efficiently separating for intermediate species and heavy constituent, thus bulkhead section product side or public is carried
Evaporate the sensitive plate temperature of section and also directly affect sideline product quality, therefore, trip temperature is entered to bulkhead section product side or public stripping section
Control, can be effectively ensured sideline product quality；Usual divided wall column bulkhead section feeding side sensitive plate be located at feed side top or
Middle and upper part, bulkhead section product side sensitive plate are located at the bottom of product side or middle and lower part, public stripping section sensitive plate carry positioned at public
Evaporate the top or middle and upper part of section.
In above-mentioned technical proposal, what the flow controller in side take-off control area controlled is sideline product produced quantity,
Its flow is according to feedstock amount and corresponds to percentage composition of the intermediate species in feed composition to be set, according to upper
The product produced quantity for stating setting automatically adjusts actual sideline product produced quantity, so as to ensure that the yield of sideline product.
In above-mentioned technical proposal, what the fluid level controller in tower reactor extraction control area controlled is the liquid of divided wall column tower reactor
Position, tower reactor product produced quantity is automatically adjusted according to the liquid level.Obviously, tower reactor liquid level is controlled, advantageously ensured that in tower
Rise vapor volume, realize the stable operation of divided wall column；Meanwhile effective control is being carried out to tower top and sideline product produced quantity
On the basis of, the yield of tower reactor product is in turn ensure that, realizes the material balance of whole tower.
Sum it up, the corresponding relation based on temperature in rectifying column with composition, feed side and product side (or public stripping
Section) sensitive plate temperature directly affect product side roof part and decline the content that heavy constituent and product side bottom rise heavy constituent, namely
The quality of sideline product is directly affected, therefore, by controlling suitable sensitive plate temperature to ensure the quality of sideline product.This
In invention by adjust feedstock temperature in feedstock control area and liquid collect and distribution control area in entering
Expect side or product side distribution liquid measure, realize the temperature control to feed side and product side (or public stripping section) sensitive plate respectively
System, it is achieved thereby that to product side impurity, the especially control of heavy constituent content, ensure that sideline product quality；Based on rectifying
Reflux ratio directly affects overhead product quality in tower, and this research is by adjusting the phegma in overhead reflux and extraction control area
Flow and overhead product produced quantity, realize to divided wall column overhead reflux than control, so as to ensure that overhead product quality；Together
When, on the premise of tower top and sideline product quality is ensured, the present invention is controlled by feedstock control area and side take-off
Two flow controllers in region realize the control to feedstock amount and sideline product produced quantity respectively, so as to ensure that
The yield of tower top and sideline product；In addition, stable operation and product produced quantity based on divided wall column are by tower inner vapor amount or gas-liquid
The influence of flow, the present invention by adjust tower reactor produce control area in tower reactor produced quantity and reboiler heat realize respectively
Control to tower reactor liquid level and overhead condensation tank liquid level, and the bottom by adjusting liquid collection and distribution control area distillates
Total amount of liquid realizes the Liquid level to the region, so as on the one hand ensure that the material of gas-liquid flow in tower and whole tower is put down
Weighing apparatus, now, in the case where tower top and sideline product quality and yield have achieved effective control, the product quality and receipts of tower reactor
Rate is also further guaranteed, and on the other hand then ensure that the stable operation of full tower regional, realizes whole divided wall column
Stable operation；Therefore, to above-mentioned five control areas, i.e., feedstock control area, overhead reflux and extraction control area,
Liquid is collected and trip temperature, flow are entered in distribution control area, side take-off control area and tower reactor extraction control area respectively
And the control of liquid level, it can not only ensure the quality and yield of tower top, side line and tower reactor product, moreover it is possible to ensure to include in divided wall column
The stable operation of the regionals such as tower top, tower reactor, public rectifying section bottom, finally realizes the stable operation of whole tower.Therefore, use
Technology disclosed by the invention can preferably solve that conventional divided wall column operational control is difficult, stability is bad and product quality and receipts
The uppity technical problem of rate.
Brief description of the drawings
Fig. 1 is divided wall column method of controlling operation thereof schematic diagram a involved in the present invention；
Fig. 2 is divided wall column method of controlling operation thereof schematic diagram b involved in the present invention；
Fig. 3 is the divided wall column control method schematic diagram described in comparative example 1；
Fig. 4 is the divided wall column control method schematic diagram described in comparative example 2.
In Fig. 1, C101 is divided wall column, E101 is overhead condenser, E102 is tower reactor reboiler, E103 is raw material preheating
Device；TIC is temperature controller, FIC is flow controller, LIC is fluid level controller；Middle part of the demarcation strip along tower is placed, and will be divided
Wall tower is divided into 4 parts, and I is public rectifying section, II is public stripping section, III is bulkhead section feeding side, IV is bulkhead section product
Side；N1 is bulkhead section feeding side sensitive plate, N2 is bulkhead section product side sensitive plate；Logistics (101) is raw material, logistics (102) is
Overhead product, logistics (103) are sideline product, logistics (104) is tower reactor product, logistics (105) is overhead reflux liquid, logistics
(106) be public rectifying section bottom distillate, logistics (107) is the distribution liquid of bulkhead section feeding side, logistics (108) is bulkhead section
The distribution liquid of product side.
In Fig. 1, feedstock region controls feedstock valve opening, using the spirit of bulkhead section feeding side using flow controller
Quick plate N1 temperature control feedstock temperature；Overhead reflux and use region are adjusted using flow controller control overhead reflux liquid
Save valve opening, control valve opening is produced, using return tank of top of the tower Liquid level tower reactor using flow controller control overhead product
Reboiler E102 heating power or flow rate of heat medium；Liquid is collected and distribution region uses public rectifying section bottom liquid collecting region
Liquid level bottom distillate liquid total flow, using bulkhead section product side sensitive plate N2 temperature control product side distribute liquid
The control valve opening of body；Side take-off region is using flow controller control sideline product extraction control valve opening；Tower reactor produces
Region is using tower reactor liquid level control tower kettle product extraction control valve opening.
In Fig. 2, except the temperature control feedstock temperature using bulkhead section product side sensitive plate N2, and using bulkhead
The control valve opening of section feeding side sensitive plate N1 temperature control feed side distribution liquid is different outer, remaining control program with figure
1 is identical.
In Fig. 3, in addition to feed preheater, the equipment and logistics of divided wall column are consistent with Fig. 1, and its control program is：Pass through tower
Top product form control tower top backflow volume, by sideline product composition control sideline product produced quantity, pass through tower reactor product group
Demarcation strip two is controlled into control tower reactor reboiler heat duty, and by the heavy constituent content in bulkhead section feeding side roof part gas phase
The ratio of liquid is distributed in side.
In Fig. 4, the equipment and logistics of divided wall column are consistent with Fig. 1, and its control program is：Pass through the spirit of bulkhead section product side roof part
Quick plate temperature control tower top backflow volume, by overhead condenser Liquid level overhead product produced quantity, pass through public rectifying section
Bottom liquid collecting region Liquid level bulkhead section feeding side distribution liquid measure, passing ratio controller control dividing plate both sides distribution liquid measure
Between ratio, by bulkhead section product side bottom sensitive plate temperature control sideline product produced quantity, and pass through tower reactor liquid level control
Tower reactor product produced quantity processed.
Below by embodiment, the invention will be further elaborated.
Embodiment
【Embodiment 1】
Using benzene/methylbenzene/mixed xylenes material as raw material, its composition by weight percentage for 12.80% benzene+
The mixed xylenes of 70.69% toluene+16.51%.On the basis of feed rate 80g/min, divided wall column operation control as shown in Figure 1
Method processed is separated, and tower top obtains benzaldehyde product, and side line obtains toluene product, and tower reactor obtains mixed xylenes product.Wherein divide
Total number of theoretical plate of wall tower is 70, the number of theoretical plate of public rectifying section is 15, the number of theoretical plate of bulkhead section feeding side and product side
It is 35, the 23rd piece of theoretical plate of raw material from bulkhead section feeding side I numbers from top to bottom enters, toluene is from bulkhead section product side III
The 17th piece of theoretical plate extraction of number from top to bottom, operating pressure is normal pressure, and bulkhead section feeding side sensitive plate N1 and product side are sensitive
Plate N2 control temperature is respectively 108.4 DEG C, 110.9 DEG C, tower top, the produced quantity of sideline product, and top reflux flow rate
It is controlled as 10.2g/min, 56.5g/min, 122.4g/min, the liquid level point of overhead condensation tank, liquid collection region and tower reactor
Do not control 50%, 60%, 80%, control result is as shown in table 1.As can be seen that benzene, toluene and mixed xylenes product it is pure
Degree reaches more than 99.9%, and the yield of benzene and toluene also reaches more than 99.9%, while the stabilization time of whole tower is shorter, about
3hr, separating effect and stabilization time are significantly better than that comparative example, illustrate that method of controlling operation thereof involved in the present invention realizes point
The preferable control effect of wall tower.
【Embodiment 2】
Using benzene/methylbenzene/mixed xylenes material as raw material, its composition by weight percentage for 33.85% benzene+
The mixed xylenes of 54.61% toluene+11.54%.On the basis of feed rate 80g/min, divided wall column operation control as shown in Figure 1
Method processed is separated, and total number of theoretical plate of wherein divided wall column is 70, the number of theoretical plate of public rectifying section is 20, bulkhead section feeding
The number of theoretical plate of side and product side is 30, and raw material enters from bulkhead section feeding side I the 17th piece of theoretical plate counted from top to bottom, first
The 15th piece of theoretical plate extraction that benzene counts from top to bottom from bulkhead section product side III, operating pressure are normal pressure, and bulkhead section feeding side is clever
Quick plate N1 and product side sensitive plate N2 control temperature are respectively 108.6 DEG C, 111.3 DEG C, tower top, the produced quantity of sideline product,
And top reflux flow rate is controlled as 27.1g/min, 43.6g/min, 352.3g/min, overhead condensation tank, liquid are received
The liquid level of Ji Qu and tower reactor controls 60%, 60%, 75% respectively, and control result is as shown in table 1.As can be seen that change raw material
After composition and the structural parameters of divided wall column, method of controlling operation thereof involved in the present invention has equally reached preferable control effect.
【Embodiment 3】
Using ethanol/isobutanol/n-amyl alcohol mixed material as raw material, its composition by weight percentage is 12.80% second
The n-amyl alcohol of the isobutanol of alcohol+70.69%+16.51%.On the basis of feed rate 80g/min, divided wall column operation as shown in Figure 1
Control method is separated, and tower top obtains alcohol product, and side line obtains isobutanol product, and tower reactor obtains n-amyl alcohol product.Wherein
For divided wall column structural parameters with embodiment 1, operating pressure is normal pressure, bulkhead section feeding side sensitive plate N1 and product side sensitive plate N2's
Control temperature is respectively 105.7 DEG C, 108.0 DEG C, tower top, the produced quantity of sideline product, and top reflux flow rate controls respectively
10.2g/min, 56.5g/min, 117.3g/min are made as, the liquid level of overhead condensation tank, liquid collection region and tower reactor controls respectively
60%, 60%, 80%, control result is as shown in table 1.As can be seen that after changing separation mixture, operation involved in the present invention
Control method still can realize preferable control effect.
【Embodiment 4】
The position for changing sensitive plate N2 is public stripping section sensitive plate, and the N2 temperature that controls is 113.5 DEG C, and remaining is same
Embodiment 1, control result is also as shown in table 1.As can be seen that after changing position of sensitive plate, operational control involved in the present invention
Method can also realize preferable control effect.
The control effect of table 1
| Embodiment 1 | Embodiment 2 | Embodiment 3 | Embodiment 4 | |
| Product quality | ||||
| Benzaldehyde product concentration wt% | 99.99 | 99.96 | 99.94 | 99.98 |
| Toluene product design wt% | 99.96 | 99.95 | 99.94 | 99.95 |
| Mixed XYLENE product design wt% | 99.92 | 99.90 | 99.95 | 99.91 |
| Product yield | ||||
| Benzaldehyde product yield wt% | 100.00 | 99.97 | 99.95 | 99.99 |
| Toluene product yield wt% | 99.98 | 99.96 | 99.94 | 99.98 |
| Mixed XYLENE benzaldehyde product yield wt% | 99.83 | 99.80 | 99.84 | 99.92 |
| Stable state | ||||
| Stabilization time hr | ≈3 | ≈3 | ≈3 | 3~4 |
【Embodiment 5】
Formed using divided wall column same as Example 1 and raw material, divided wall column method of controlling operation thereof as shown in Figure 2 is carried out
Separation, tower top obtain benzaldehyde product, and side line obtains toluene product, and tower reactor obtains mixed xylenes product, control parameter and embodiment 1
Identical, control result is as shown in table 1.As can be seen that the purity of benzene, toluene and mixed xylenes product reach 99.9% with
On, the yield of benzene and toluene also reaches more than 99.9%, while the stabilization time of whole tower is shorter, about 4hr, separating effect and stably
Time is significantly better than that comparative example, illustrates that method of controlling operation thereof involved in the present invention realizes divided wall column and preferably controls effect
Fruit.
【Comparative example 1】
Formed using divided wall column same as Example 1 and raw material, control method as shown in Figure 3 is separated, and is controlled
It the results are shown in Table shown in 2.As can be seen that under the control method, in order to ensure that the product purity of benzene and toluene is not less than 99.9%, tower
The purity and yield of kettle mixed xylenes is difficult to ensure that, only 99.78%, while the stabilization time of whole tower is longer, more than 10hr；
If further increasing the thermic load of tower reactor reboiler, the purity of tower reactor mixed xylenes can be improved to 99.9%, but now public
Pressure difference below stripping section and dividing plate significantly increases, and rises to 3KPa by 0.5KPa, the stable operation of divided wall column is destroyed.
【Comparative example 2】
Formed using divided wall column same as Example 1 and raw material, control method as shown in Figure 4 is separated, and is controlled
It the results are shown in Table shown in 2.As can be seen that under the control method, the purity of benzene and toluene product is substantially relatively low, especially benzene, reason
It is, only controls the temperature of product side roof part column plate and the liquid phase distribution of bulkhead section both sides, effectively can only control in sideline product
The content of impurity benzene and dimethylbenzene, that is, control the product quality of side line toluene, but can not ensure overhead benzene and tower reactor dimethylbenzene
Product quality；Meanwhile in the control program, because the evaporation capacity in tower or gas-liquid flow are not controlled accordingly, cause product
Yield can not be effectively controlled, and the yield such as tower reactor mixed xylenes is significant lower, while the stabilization time of divided wall column also phase
To longer.
The control effect of 2 different control programs of table
| Embodiment 1 | Embodiment 5 | Comparative example 1 | Comparative example 2 | |
| Product quality | ||||
| Benzaldehyde product concentration wt% | 99.99 | 99.99 | 99.96 | 99.85 |
| Toluene product design wt% | 99.96 | 99.94 | 99.95 | 99.92 |
| Mixed XYLENE product design wt% | 99.92 | 99.91 | 99.78 | 99.62 |
| Product yield | ||||
| Benzaldehyde product yield wt% | 100.00 | 100.00 | 99.97 | 100.00 |
| Toluene product yield wt% | 99.98 | 99.96 | 99.94 | 99.88 |
| Mixed XYLENE benzaldehyde product yield wt% | 99.83 | 99.80 | 99.81 | 99.65 |
| Stable state | ||||
| Stabilization time hr | ≈3 | ≈4 | ≥10 | ≥5 |
Claims (10)
1. a kind of method of controlling operation thereof of divided wall column, including following five control areas：
(1) feedstock control area：Enter using flow controller control feedstock amount, using temperature controller control raw material
Material temperature degree；
(2) overhead reflux and extraction control area：Using flow controller control overhead product produced quantity, using flow controller
Control tower top backflow volume, tower reactor reboiler heat is controlled using fluid level controller；
(3) control area is collected and distributed to liquid：Using fluid level controller control public rectifying section bottom distillate liquid flow,
Using the distribution liquid measure of temperature controller control bulkhead section side；
(4) side take-off control area：Sideline product produced quantity is controlled using flow controller；
(5) tower reactor extraction control area：Tower reactor product produced quantity is controlled using fluid level controller.
2. the method for controlling operation thereof of divided wall column according to claim 1, it is characterised in that in feedstock control area
Flow controller control is feedstock amount, and actual feedstock amount is automatically adjusted according to the feedstock amount of setting.
3. the method for controlling operation thereof of divided wall column according to claim 1, it is characterised in that in feedstock control area
Temperature controller control be divided wall column bulkhead section feeding side sensitive plate temperature or bulkhead section product side sensitive plate temperature,
Or the temperature of public stripping section sensitive plate, and according to above-mentioned sensitive plate temperature automatic adjustment feedstock temperature.
4. the method for controlling operation thereof of divided wall column according to claim 1, it is characterised in that overhead reflux and extraction control zone
2 flow controllers are shared in domain, one of control is overhead product produced quantity, and another control is overhead reflux liquid
Flow；The former is to carry out flow set according to percentage composition in feed composition of feedstock amount and corresponding light component,
The latter is then that when corresponding overhead product produced quantity carries out flow set, two flows according to the backflow needed for divided wall column
Controller automatically adjusts actual overhead product produced quantity and top reflux flow rate according to respective setting value.
5. the method for controlling operation thereof of divided wall column according to claim 1, it is characterised in that overhead reflux and extraction control zone
What the fluid level controller in domain controlled is the liquid level of return tank of top of the tower, and tower reactor reboiler heat is automatically adjusted according to the liquid level.
6. the method for controlling operation thereof of divided wall column according to claim 1, it is characterised in that liquid is collected and distribution control zone
What the fluid level controller in domain controlled is the liquid level of the public rectifying section bottom liquid collecting zone of divided wall column, automatic according to the liquid level
Regulation bottom distillates the total flow of liquid.
7. the method for controlling operation thereof of divided wall column according to claim 1, it is characterised in that liquid is collected and distribution control zone
What the temperature controller in domain controlled is the temperature or bulkhead section product side sensitive plate of divided wall column bulkhead section feeding side sensitive plate
The temperature of temperature or public stripping section sensitive plate, and correspond to according to above-mentioned sensitive plate temperature automatic adjustment the distribution liquid measure of side.
8. the method for controlling operation thereof of the divided wall column according to claim 1 or 3 or 7, it is characterised in that when feedstock controls
When what the temperature controller in region controlled is the temperature of divided wall column bulkhead section feeding side sensitive plate, then liquid is collected and distribution is controlled
What the temperature controller in region processed controlled is exactly the temperature of bulkhead section product side sensitive plate or the temperature of public stripping section sensitive plate
Degree；When in feedstock control area temperature controller control be divided wall column bulkhead section product side sensitive plate temperature or public affairs
Altogether during the temperature of stripping section sensitive plate, then what liquid collection and the temperature controller distributed in control area controlled is exactly bulkhead section
The temperature of feed side sensitive plate.
9. the method for controlling operation thereof of divided wall column according to claim 1, it is characterised in that in side take-off control area
Flow controller control is sideline product produced quantity, and its flow is in charging group according to feedstock amount and corresponding intermediate species
Percentage composition in automatically adjusts actual sideline product according to the product produced quantity of above-mentioned setting and produced come what is set
Amount.
10. the method for controlling operation thereof of divided wall column according to claim 1, it is characterised in that in tower reactor extraction control area
What fluid level controller controlled is the liquid level of divided wall column tower reactor, and tower reactor product produced quantity is automatically adjusted according to the liquid level.
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| CN107837553B (en) | 2020-09-04 |
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