CN105733676A - Energy-efficient absorption stable process and system - Google Patents
Energy-efficient absorption stable process and system Download PDFInfo
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- CN105733676A CN105733676A CN201410732095.6A CN201410732095A CN105733676A CN 105733676 A CN105733676 A CN 105733676A CN 201410732095 A CN201410732095 A CN 201410732095A CN 105733676 A CN105733676 A CN 105733676A
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Abstract
The invention relates to an energy-efficient absorption stable process and system. The process is as below: mixing compressed rich gas from a rich gas compressor, desorbed gas from a desorption column top and a rich absorbent liquid from an absorption column bottom, condensing the mixture and sending the mixture into a vapor-liquid separation tank; sending a separated liquid phase into the desorption column, sending the materials at the desorption column bottom into a stable column, and separating to obtain a liquefied gas and stable gasoline; sending an isolated gas phase into the absorption column, contacting and reacting the gas phase with a countercurrent absorbent, reacting lean gas discharged from absorption column overhead with a secondary absorbent in a secondary absorption reactor to obtain a gas phase of dry gas; sending a liquid rich absorption oil into a desorption reactor to achieve secondary absorbent regeneration; discharging portion of the regenerated secondary absorbent or returning the regenerated secondary absorbent to a secondary absorption reactor; and returning the gas discharged by desorption reactor to the rich gas compressor through a vacuum pump. The process cancels the inner loop of supplement of stable gasoline absorbent in an original absorption stabilization system, and significantly reduces energy consumption of the system.
Description
Technical field
The present invention relates to petroleum refining industry, particularly the device such as catalytic cracking, delayed coking absorption stabilizing process and system.
Background technology
Absorbing-stabilizing system is the last handling process of catalytic cracking unit and delayed coking unit in petroleum refining industry, its objective is to utilize absorption and principles of rectification that the rich gas in fractionator overhead catch pot and raw gasoline are divided into dry gas (C2Below), liquefied gas (C3、C4) and the qualified stable gasoline of vapour pressure.The energy efficiency of catalytic cracking and delayed coking unit is played a very important role by the device of absorbing-stabilizing system and process optimization.
Absorbing-stabilizing system flow process commonly used at present has four towers, that is: absorption tower, desorber, reabsorber and stabilizer, its typical process flow is as shown in Figure 1: the stripping gas 7 that the rich oil 6 at the bottom of absorption tower ejects with the compression rich gas 5 exported from rich gas compressor and desorber mix and cooler 19 cooled down after entrance knockout drum 9, separate the liquid phase obtained after pump pressurizes, enter desorber 3, deethanization gasoline at the bottom of desorber tower first enters back into the middle part of stabilizer 4 with stable gasoline after heat exchanger 20 heat exchange, stable gasoline and liquefied gas 10 is isolated through stabilizer；The stable gasoline obtained at the bottom of stabilizer tower is through heat exchanger 20, 21 heat exchange rear sections go out device as product 12, partly as supplementary absorbent 11(stable gasoline) enter the top on absorption tower 1, raw gasoline 14 enters the 4th block of plate on absorption tower 1 as absorbent, absorption tower is provided with 2 middle section water coolers 17, 18, to take absorption process liberated heat away, counter current contacting reaction is carried out with the gas phase 8 from knockout drum, the lean gas of absorption tower Base top contact is directly entered the bottom of reabsorber 2, react at reabsorber with the diesel oil 15 come from fractionating column, absorb the heavy constituent carried secretly in lean gas further, rich absorbent oil 16 returns main fractionating tower.Dry gas 13 goes out to be incorporated to gas pipe network from reabsorber top row.
Fast development and civil liquefied gas demand recently as low carbon chemical expand gradually, improve the separation accuracy of dry gas and liquefied gas, improve liquefied gas yield, have become as refinery and promote an important means of economic benefit, additionally along with the increase day by day of energy-saving and emission-reduction pressure, how to reduce energy consumption and also become the focus of concern.Absorbing-stabilizing system ubiquitous common problem main manifestations in current refinery is:Dry gas is not done, and carries substantial amounts of liquefied gas in dry gas secretly, and liquefied gas content is at 3%(v) more than, cause that the liquefied gas of a large amount of high added value is taken as fuel directly to burn thus causing the huge waste of resource；Absorption tower assimilation effect is undesirable, in order to reduce the liquefied gas concentration in dry gas, absorbent (stable gasoline) circulating load must be supplemented by increasing again and improve assimilation effect, the increase supplementing absorbent circulating load not only results in desorber and the increase of stabilizer energy consumption, also creates the decline of system actual treatment ability.
Although disclosing many patents about absorbing-stabilizing system in recent years, such as patent 200910068555.9,200910069667.6,201110000183.3 and 200410083887.1 etc., but the process program that these patents propose and traditional handicraft do not have essential distinction, being required for the liquefied gas content retaining supplementary stable gasoline internal recycle to ensure in dry gas, the process characteristic of these schemes determines guarantee dry gas mass dryness fraction, and contradiction cannot be solved by this simultaneously with reducing system energy consumption.
Summary of the invention
It is an object of the invention to the deficiency overcoming existing technique to exist, it is provided that a kind of Vapor recovery unit new technology and system, while liquefied gas concentration is greatly reduced in making dry gas, system energy consumption is greatly reduced.
Current China diesel oil boiling range scope is at 180 DEG C ~ 360 DEG C, gasoline end point is 205 DEG C, therefore there is in diesel oil the problem carrying a certain amount of gasoline secretly, owing to catalytic diesel oil is worth relatively low, and catalytic gasoline is worth higher, therefore in the catalytic diesel oil of low value, the high-quality gasoline of entrainment portions can cause certain economic loss undoubtedly.In current catalytic unit, diesel oil is that the side take-off by fractionating column obtains, and raw gasoline is from the extraction of fractionating column top, and current this separation process can not realize the clear cutting of gasoline and diesel oil.
Existing absorption stabilizing process and system are both provided with supplementing stable gasoline internal recycle, in order to ensure the mass dryness fraction of dry gas, in addition it is also necessary to utilizing diesel oil to supplement and absorb, diesel oil rich absorbent oil returns again in the middle part of fractionating column, utilize the heat of fractionating column to realize separating of diesel oil and lighter hydrocarbons.Owing to by the thermally equilibrated restriction of fractionating column, the amount of diesel oil absorbent again can not be too big, so cannot pass through to strengthen diesel oil absorbed dose to cancel stable gasoline internal recycle.
The present invention provides a kind of energy-saving absorption stabilizing process, and described technique includes herein below: enter vapor-liquid separation tank after absorbing liquid mixing condensed cooling from the richness at the bottom of the compression rich gas of rich gas compressor, the stripping gas of desorber tower top and absorbing tower；After vapor-liquid separation tank separates, separating the liquid phase obtained and enter desorber from the top of desorber, the stripping gas that desorber tower top is discharged returns vapor-liquid separation tank after cooling, and desorber materials at bottom of tower enters stabilizer, obtains liquefied gas and stable gasoline after separation；Vapor-liquid separation tank separates the gas phase obtained and enters the bottom on absorption tower, react with the first order absorption agent counter current contacting entered from top, absorption tower, the reacted rich liquid that absorbs enters knockout drum after cooling, the lean gas gone out from absorption tower top row and two grades of absorbent haptoreactions in two grades of absorption reactor thermallies, the gas phase being obtained by reacting is dry gas, enter desorbing reactor after liquid phase rich absorbent oil is heated and realize the regeneration of two grades of absorbent, arrange outside two grades of absorbent parts after regeneration, part returns two grades of absorption reactor thermallies after cooling, the gas phase that desorbing reactor is discharged returns rich gas compressor entrance through vacuum pump.
In absorption stabilizing process of the present invention, absorbing liquid mixing and after one-level condensing cooling from the richness at the bottom of the compression rich gas of rich gas compressor, the stripping gas of desorber tower top and absorbing tower, temperature of charge is 25～50 DEG C, it is preferred to 35～40 DEG C.
In absorption stabilizing process of the present invention, described vapor-liquid separation tank temperature is 20～50 DEG C, it is preferred to 35～40 DEG C, and operation pressure is 1～2Mpa, it is preferred to 1.2～1.5Mpa.
In absorption stabilizing process of the present invention, described absorption tower tower top temperature is 40～45 DEG C, and stage casing, absorption tower arranges 1～3 intercooler, makes the temperature on absorption tower be maintained between 30～50 DEG C.
In absorption stabilizing process of the present invention, the first order absorption agent on described absorption tower is raw gasoline, is typically from fractionator overhead.
In absorption stabilizing process of the present invention, two grades of absorbent of described two grades of absorption reactor thermallies are the diesel oil from fractionating column side take-off, and its boiling range is 180 ~ 360 DEG C, and temperature is 30～50 DEG C.
In absorption stabilizing process of the present invention, described two grades of absorption reactor thermallies can be cyclone, rotating packed bed reactor or absorption tower, it is preferred to rotating packed bed reactor.The operating condition of described two grades of absorption reactor thermallies is temperature is 30～50 DEG C, and liquid-gas ratio (absorbent and lean gas mass ratio) is 5～40, and operation pressure is 1.0 ~ 1.5Mpa.
In absorption stabilizing process of the present invention, described desorbing reactor can be cyclone, rotating packed bed reactor or flash tank, it is preferred to rotating packed bed reactor.Described rich absorbent oil temperature after heating is 50～100 DEG C, it is preferred to 60～70 DEG C, and desorbing reactor is vacuumizing, and operation pressure is 5～50Kpa, it is preferred to 15～20Kpa.
In absorption stabilizing process of the present invention, two grades of absorbent after described regeneration are the diesel oil eliminating light end, and its initial boiling point is more than 200 DEG C, it is preferable that more than 205 DEG C, and after cooling, temperature is 30～50 DEG C.
The present invention also provides for a kind of energy-saving absorbing-stabilizing system, and described system includes rich gas compressor, knockout drum, absorption tower, desorber, stabilizer, two grades of absorption reactor thermallies, desorbing reactor, vacuum pumps；At the bottom of rich gas compressor outlet, absorbing tower, liquid-phase outlet, desorber tower top outlet condensed device respectively is connected with knockout drum, and knockout drum liquid-phase outlet is connected with desorber through pipeline, and desorber liquid-phase outlet is connected with stabilizer；Knockout drum gaseous phase outlet is connected with bottom, absorption tower, absorption tower tower top outlet connects through pipeline and two grades of absorption reactor thermallies, two grades of absorption reactor thermally liquid-phase outlets are connected with desorbing reactor through heat exchanger, desorbing reactor liquid-phase outlet divides two-way, wherein two grades of absorbent entrances of a cooled device in road and two grades of absorption reactor thermallies connect, another road is connected with product storage tank, and desorbing reactor gaseous phase outlet is connected with rich gas compressor entrance through vacuum pump.
In absorbing-stabilizing system of the present invention, described two grades of absorption reactor thermallies can be cyclone, rotating packed bed reactor or absorption tower, it is preferred to rotating packed bed reactor.
In absorbing-stabilizing system of the present invention, described desorbing reactor can be cyclone, rotating packed bed reactor or flash tank, it is preferred to rotating packed bed reactor.
In absorbing-stabilizing system of the present invention, stage casing, absorption tower is provided with 1～3 intercooler.
In absorbing-stabilizing system of the present invention, described high-gravity rotating bed absorption, stripping apparatus, all kinds in prior art can be used high-gravity rotating bed, high-gravity rotating bed scale and form can be determined according to the scale of device and operating condition, specifically can include parallel type, reverse-flow and cross-current type, and preferentially select reverse-flow high-gravity rotating bed.
The present invention adopts the high-gravity rotating bed absorption equipment as absorbing-stabilizing system, hypergravity absorption equipment utilizes rotor to rotate the hypergravity effect produced, liquid is stretched or tears, produce the huge area that contacts, drastically increasing mass transfer rate coefficient, compared to traditional filler or tower tray, mass tranfer coefficient can improve 1 ~ 3 order of magnitude, absorption process theoretical stage is greatly improved, substantially increases the diesel oil absorbent assimilation effect to liquefied gas.The present invention makes full use of the feature that high-gravity rotating bed devolatilization function is strong, uses it for the desorption process of two grades of absorbent, substantially increases desorption efficiency and degree of desorption, improves the quality of absorbent regeneration, and makes energy consumption be greatly reduced.
The present invention is by adopting efficient mass transfer equipment, establish proprietary re-absorption blood circulation, eliminate supplementary this internal recycle of stable gasoline absorbent of former absorbing-stabilizing system, the energy consumption making system is greatly reduced, and liquefied gas entrainment rate is reduced to 1% (v) below in the product that makes to bring about the desired sensation, substantially increase the economic benefit of device, additionally for old device, it is also possible to device disposal ability is greatly improved.
The present invention utilizes the devolatilization function of overweight revolving bed cleverly, eliminates the gasoline fraction in diesel oil, it is achieved that the clear cutting of diesel oil and gasoline, has reached the purpose of increasing gasoline yield, has significantly increased device economic benefit.And using high-gravity rotating bed as absorption equipment, tower problem is rushed in the sudden liquid flooding that the tower of solving over causes because diesel oil absorbent easily foams, and has ensured device long period safe operation.
Accompanying drawing explanation
Fig. 1 is ventional absorption stabilisation systems process chart.
Fig. 2 is absorbing-stabilizing system process chart of the present invention.
Detailed description of the invention
The present invention provides a kind of energy-saving absorbing-stabilizing system, and in conjunction with Fig. 2, described system includes rich gas compressor 24, knockout drum 9, absorption tower 2, desorber 11, stabilizer 25, two grades of absorption reactor thermallies 16, desorbing reactor 20, vacuum pumps 23；Rich gas compressor 24 exports, liquid-phase outlet, desorber 11 tower top outlet condensed device 7 respectively at the bottom of the tower of absorption tower 2 is connected with knockout drum 9, and knockout drum 9 liquid-phase outlet is connected with desorber 11 through pipeline, and desorber 11 liquid-phase outlet is connected with stabilizer 25；Knockout drum 9 gaseous phase outlet is connected with bottom, absorption tower 2, absorption tower 2 tower top outlet connects through pipeline and two grades of absorption reactor thermallies 16, two grades of absorption reactor thermally 16 liquid-phase outlets are connected with desorbing reactor 20 through heat exchanger 26, desorbing reactor 20 liquid-phase outlet divides two-way, wherein a cooled device 25 in road 19 is connected with two grades of absorbent entrances of two grades of absorption reactor thermallies 16, product storage tank is removed through pipeline in another road 27, and desorbing reactor gaseous phase outlet is connected with rich gas compressor 23 entrance through vacuum pump.
In conjunction with Fig. 2, absorption stabilizing process flow process of the present invention is further illustrated, and the rich gas 3 from fractionating column absorbs liquid 5 after rich gas compressor 24 supercharging and mixes and enter vapor-liquid separation tank 9 after cooled device 7 one-level condensing cooling with the richness at the bottom of the stripping gas 6 of desorber 11 tower top and absorption tower 2 tower；After vapor-liquid separation tank separates, separate the liquid phase 10 obtained and enter desorber 11 from the top of desorber, the stripping gas 6 that desorber 11 tower top is discharged returns vapor-liquid separation tank 9 after cooling, and desorber 11 materials at bottom of tower 12 enters stabilizer 25, obtains liquefied gas 14 and stable gasoline 13 after separation；nullVapor-liquid separation tank 9 separates the gas phase 4 obtained and enters the bottom on absorption tower 2，React with first order absorption agent raw gasoline 1 counter current contacting entered from top, absorption tower 2，Stage casing, described absorption tower arranges one-level interconderser 8，The reacted rich cooled device of liquid 57 that absorbs cools down laggard knockout drum 9，The lean gas 15 that goes out from absorption tower 2 top row and two grades of absorbent (mixture of diesel oil 22 and partial regeneration absorbent from fractionating column) haptoreaction in two grades of absorption reactor thermallies 16，The gas phase being obtained by reacting is dry gas 17，Liquid phase rich absorbent oil 18 enters desorbing reactor 20 after heat exchanger 26 heats up and realizes the regeneration of two grades of absorbent，Two grades of absorbent after regeneration can divide two-way，A wherein outer row in road 27，The cooled device 25 in another road 19 cools down Posterior circle and returns two grades of absorption reactor thermallies 16，The gas phase 21 that desorbing reactor is discharged returns rich gas compressor entrance through vacuum pump 23.
Method provided by the invention will be further described by the following examples, but therefore the present invention is not restricted.
Embodiment 1
For the absorbing-stabilizing system of certain 500,000 tons/year of catalytic cracking unit domestic, ASPENPLUS process simulation software is adopted respectively present invention process and traditional handicraft to be simulated:
Adopt present invention process key process parameter as follows: compressor delivery pressure 1.4MPa, vapor-liquid separation tank operation temperature 35 DEG C, desorber liquid phase feeding temperature 35 DEG C, absorption tower arranges an intermediate reboiler and returns tower temperature 35 DEG C, removing oil ethane content 0.1%w at the bottom of desorber tower, reflux ratio 2.2 determined by stabilizer, diesel oil internal recycle amount 20t/h, diesel regenerated initial boiling point 205 DEG C, catalytic diesel oil inlet amount 13.2t/h, desorbing bed vacuum 15KPa, dry gas yield 2.5t/h, liquefied gas yield 14t/h, stable gasoline yield 28t/h.
Comparative example 1
Adopt the conventional process flow described in Fig. 1, however it remains stable gasoline internal recycle and diesel oil resorption process, stable gasoline internal recycle amount 30t/h, reabsorber diesel feed amount 11t/h.
Energy consumption comparative result such as table 1.
Table 1 observable index is relatively
| Project | Traditional handicraft | Present invention process |
| Desorption tower reboiler | 2543 KW | 1798 KW |
| Stabilizer reboiler | 4933 KW | 2755 KW |
| Supplement gasoline absorbent circulating load | 30 t/h | 0 t/h |
| Absorbent flow | 10 t/h | 30 t/h |
| Vacuum pump energy consumption | - | 100 KW |
| Energy consumption of compressor | - | Increase by 80 KW |
| C in dry gas3 +Content (V%) | 2.8% | 1.0% |
As can be seen from Table 1: adopt present invention process, it is possible to make C in dry gas3 +Content significantly reduces, and system energy consumption is greatly reduced.Additionally result of calculation shows, employing present invention process can increasing gasoline yield 0.4t/h.
Claims (16)
1. an energy-saving absorption stabilizing process, described technique includes herein below: enter vapor-liquid separation tank after absorbing liquid mixing condensed cooling from the richness at the bottom of the compression rich gas of rich gas compressor, the stripping gas of desorber tower top and absorbing tower；After vapor-liquid separation tank separates, separating the liquid phase obtained and enter desorber from the top of desorber, the stripping gas that desorber tower top is discharged returns vapor-liquid separation tank after cooling, and desorber materials at bottom of tower enters stabilizer, obtains liquefied gas and stable gasoline after separation；Vapor-liquid separation tank separates the gas phase obtained and enters the bottom on absorption tower, react with the first order absorption agent counter current contacting entered from top, absorption tower, the reacted rich liquid that absorbs enters knockout drum after cooling, the lean gas gone out from absorption tower top row and two grades of absorbent haptoreactions in two grades of absorption reactor thermallies, the gas phase being obtained by reacting is dry gas, enter desorbing reactor after liquid phase rich absorbent oil is heated and realize the regeneration of two grades of absorbent, arrange outside two grades of absorbent parts after regeneration, part returns two grades of absorption reactor thermallies after cooling, the gas phase that desorbing reactor is discharged returns rich gas compressor entrance through vacuum pump.
2. the technique described in claim 1, it is characterized in that: absorb liquid mixing and after one-level condensing cooling from the richness at the bottom of the compression rich gas of rich gas compressor, the stripping gas of desorber tower top and absorbing tower, temperature of charge is 25～50 DEG C, it is preferred to 35～40 DEG C.
3. the technique described in claim 1, it is characterised in that: described vapor-liquid separation tank temperature is 20～50 DEG C, and operation pressure is 1～2Mpa, it is preferable that temperature is 35～40 DEG C, and operation pressure is 1.2～1.5Mpa.
4. the technique described in claim 1, it is characterised in that: described absorption tower tower top temperature is 40～45 DEG C, and stage casing, absorption tower arranges 1～3 intercooler, makes the temperature on absorption tower be maintained between 30～50 DEG C.
5. the technique described in claim 1, it is characterised in that: the first order absorption agent on described absorption tower is raw gasoline.
6. the technique described in claim 1, it is characterised in that: two grades of absorbent of described two grades of absorption reactor thermallies are diesel oil.
7. the technique described in claim 6, it is characterised in that: two grades of absorbent of described two grades of absorption reactor thermallies are the diesel oil from fractionating column side take-off, and its boiling range is 180 ~ 360 DEG C, and temperature is 30～50 DEG C.
8. the technique described in claim 1, it is characterised in that: described two grades of absorption reactor thermallies are cyclone, rotating packed bed reactor or absorption tower, it is preferred to rotating packed bed reactor.
9. the technique described in claim 1, it is characterised in that: the operating condition of described two grades of absorption reactor thermallies is temperature is 30～50 DEG C, and liquid-gas ratio is 5～40, and operation pressure is 1.0 ~ 1.5Mpa.
10. the technique described in claim 1, it is characterised in that: described desorbing reactor is cyclone, rotating packed bed reactor or flash tank, it is preferred to rotating packed bed reactor.
11. the technique described in claim 1, it is characterised in that: described rich absorbent oil temperature after heating is 50～100 DEG C, it is preferred to 60～70 DEG C.
12. the technique described in claim 1, it is characterised in that: described desorbing reactor is vacuumizing, and operation pressure is 5～50Kpa, it is preferred to 15～20Kpa.
13. adopt in claim 1 to 12 the energy-saving absorbing-stabilizing system of absorption stabilizing process described in any claim, described system includes rich gas compressor, knockout drum, absorption tower, desorber, stabilizer, two grades of absorption reactor thermallies, desorbing reactor, vacuum pumps；At the bottom of rich gas compressor outlet, absorbing tower, liquid-phase outlet, desorber tower top outlet condensed device respectively is connected with knockout drum, and knockout drum liquid-phase outlet is connected with desorber through pipeline, and desorber liquid-phase outlet is connected with stabilizer；Knockout drum gaseous phase outlet is connected with bottom, absorption tower, absorption tower tower top outlet connects through pipeline and two grades of absorption reactor thermallies, two grades of absorption reactor thermally liquid-phase outlets are connected with desorbing reactor through heat exchanger, two grades of absorbent entrances of the cooled device of desorbing reactor liquid-phase outlet and two grades of absorption reactor thermallies connect, and desorbing reactor gaseous phase outlet is connected with rich gas compressor entrance through vacuum pump.
14. the system described in claim 1, it is characterised in that: described two grades of absorption reactor thermallies are cyclone, rotating packed bed reactor or absorption tower, it is preferred to rotating packed bed reactor.
15. the system described in claim 1, it is characterised in that: described desorbing reactor can be cyclone, rotating packed bed reactor or flash tank, it is preferred to rotating packed bed reactor.
16. the system described in claim 1, it is characterised in that: stage casing, absorption tower is provided with 1～3 intercooler.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105733663A (en) * | 2014-12-06 | 2016-07-06 | 中国石油化工股份有限公司 | Absorption stable process and system |
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| EP0023745B1 (en) * | 1977-12-01 | 1985-05-08 | Imperial Chemical Industries Plc | Process and apparatus for effecting mass transfer |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105733663A (en) * | 2014-12-06 | 2016-07-06 | 中国石油化工股份有限公司 | Absorption stable process and system |
| CN105733663B (en) * | 2014-12-06 | 2017-12-22 | 中国石油化工股份有限公司 | A kind of absorption stabilizing process and system |
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