CN204233807U - A kind of thermal bypass rectifying tower top control pressurer system - Google Patents
A kind of thermal bypass rectifying tower top control pressurer system Download PDFInfo
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- CN204233807U CN204233807U CN201420715326.8U CN201420715326U CN204233807U CN 204233807 U CN204233807 U CN 204233807U CN 201420715326 U CN201420715326 U CN 201420715326U CN 204233807 U CN204233807 U CN 204233807U
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- pipeline
- thermal bypass
- return tank
- tower top
- condenser
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Abstract
The utility model provides a kind of thermal bypass rectifying tower top control pressurer system.This thermal bypass rectifying tower top control pressurer system, it is characterized in that, at least comprise: thermal bypass pipeline, stop valve, condenser, condensate liquid control valve, return tank and reflux pump, condensator outlet pipeline is connected to return tank top condensate inlet and is provided with condensate liquid control valve on this pipeline, one end of thermal bypass pipeline is connected to by threeway the pipeline that condenser is connected with rectifying column, the other end is connected to thermal bypass gas access, return tank top, and stop valve is provided with on this thermal bypass pipeline, return tank outlet at bottom is connected to rectifying column tower top by pipeline through reflux pump, return tank top is provided with return tank Stress control pipeline.Control valve is arranged on cool condenser outlet line by this tower top pressure control system, thermal bypass pipeline is no longer established control valve only establish hand stop valve, has that control valve size is little, pipe arrangement is relatively short, tower operating pressure is low and arrange the advantages such as smooth and easy.
Description
Technical field
The utility model is about a kind of rectifying tower top control pressurer system, specifically about a kind of thermal bypass rectifying tower top control pressurer system, belongs to petroleum and chemical industry technical field.
Background technology
Rectifying column is the common device in petrochemical plant, is used to the equipment realizing a kind of mass transport process that mixture is separated.Oil or the chemical products of different size can be obtained by rectifying column operation.The pressure of rectifying column is one of important parameter of distillation operation, and pressure oscillation can destroy the vapor liquid equilibrium in tower, and then affects the material balance in tower, thus affects the separation accuracy of tower, therefore, selects a good Rectification column pressure control program most important.
The pressure control strategy of rectifying column has multiple, need do consider according to its material properties, product and operating condition etc.Wherein thermal bypass pressure control strategy is mainly used in the operating mode of the full condensation of top gaseous phase under normal operating condition.So-called thermal bypass be exactly top gaseous phase not all by overhead condenser, but have sub-fraction to enter return tank of top of the tower by tower top without condensation, the pipeline carrying this sub-fraction gas phase to enter return tank is called thermal bypass pipeline.
Illustrate the scheme of two kinds of traditional hot vapor bypass control rectifying tower top pressure below.As shown in Figure 1, in the scheme of a kind of traditional hot vapor bypass control rectifying tower top pressure wherein, when the tower top pressure of rectifying column 5 is less than setting value, hot vapor bypass control valve 2 aperture increases, the thermal bypass gas flow being entered return tank 3 by thermal bypass pipeline 1 is increased, temperature between gas, liquid two-phase interface raises, and makes return tank 3 pressure P
draise.Due to return tank 3 liquid level H
dby the control of fluid level control valve, can think and remain unchanged, and condenser 4 pressure P
ealso substantially remain unchanged in adjustment process.According to Bernoulli equation, ignoring friction loss and at H
d, P
ewhen remaining unchanged, condenser 4 liquid level H
ewith P
draise and rise, describe along with hot vapor bypass control valve 2 aperture increases, in return tank 3, liquid will flow backward in condenser 4, liquid level in condenser 4 is raised, the heat transfer area that this means to be condensed condenser 4 immersion do not have increases, vapor condensation rate reduction, make gas phase accretion of stock in rectifying column 5, and then the tower top pressure of rectifying column 5 raises gradually until reach setting value.When tower top pressure is higher than setting value, hot vapor bypass control valve 2 aperture turns down, P
dreduce, the pressure reduction between condenser 4 and return tank 3 increases, and more condensate liquid is by force feed in return tank 3, and in condenser 4, liquid level declines, and condensation of gas speed strengthens, and makes tower top pressure be reduced to setting value.
As shown in Figure 2, in the system of the comparatively conventional traditional hot vapor bypass control rectifying tower top pressure of another kind, adopt the scheme of setting up control valve on condensate liquid pipeline.In this scenario, when overhead product purity is very high, condensator outlet pipeline is set up a condensate liquid control valve 6 to improve regulating effect.When tower pressure drop is low, condensate liquid control valve 6 aperture on condensator outlet pipeline turns down, and hot vapor bypass control valve 2 aperture on thermal bypass pipeline 1 increases, and makes liquid level in condenser increase fast, and condensation of gas speed declines, and tower is pressed and increases.Otherwise when tower pressure increases, make that condensate liquid control valve 6 aperture is opened greatly, hot vapor bypass control valve 2 aperture turns down, liquid level decline in condenser, condensing rate increases, and makes tower drops thereupon.Owing to adopting two control valves jointly to regulate, it regulates sensitivity to increase substantially.
Traditional hot vapor bypass control is that the condensing surface by controlling condenser amasss control tower pressure, and its advantage is: return tank is placed on condenser, can be supplied to the net positive suction head that reflux pump is higher; Condenser needs can be placed in ground during frequent clean; Control valve is arranged on thermal bypass pipeline, and its size can significantly reduce.Traditional hot vapor bypass control tower pressing system has less expensive, practical advantage, but it has harsher requirement to technical flow design, if design improper, also can cause and control unsuccessfully.
The system of traditional hot vapor bypass control tower top pressure is arranged on by control valve on thermal bypass pipeline, and operating temperature is tower top outlet temperature, makes the operation of control valve and design temperature all relatively high like this.For some oil refining and chemical plant installations tower system more, major part top gaseous phase non-fully is solidifying or close to normal pressure, have employed other control program, and only have one or two tower to adopt the situation of traditional hot vapor bypass control system, overhead condenser is arranged in ground floor, especially adopt air cooler and quantity more time, certain influence can be caused to the uniformity of Plant arrangement and operation.
Utility model content
For solving the problems of the technologies described above, the purpose of this utility model is to provide a kind of thermal bypass rectifying tower top control pressurer system.Control valve is arranged on cool condenser outlet line by this tower top pressure control system, and thermal bypass pipeline is no longer arranged control valve stop valve is only set, this system has that control valve size is little, pipe arrangement is relatively short, tower operating pressure is low and arrange the advantages such as smooth and easy.
For achieving the above object, the utility model provides a kind of thermal bypass rectifying tower top control pressurer system, and it is characterized in that, this system at least comprises: thermal bypass pipeline, stop valve, condenser, condensate liquid control valve, return tank and reflux pump; Wherein, the entrance of condenser is connected to rectifying tower top discharging opening by pipeline, and the outlet of condenser is connected to return tank top condensate inlet by pipeline and is provided with condensate liquid control valve on this pipeline;
One end of thermal bypass pipeline is connected to by threeway the pipeline that condenser is connected with rectifying column, and the other end of thermal bypass pipeline is connected to thermal bypass gas access, return tank top, and is provided with stop valve on this thermal bypass pipeline;
Return tank outlet at bottom is connected to rectifying column tower top feed back entrance by pipeline, and is provided with reflux pump on this pipeline;
The top of return tank arranges return tank Stress control pipeline.
In above-mentioned thermal bypass rectifying tower top control pressurer system, overhead product pipeline can be connected to by threeway the pipeline be connected with rectifying column tower top bottom return tank.
In above-mentioned thermal bypass rectifying tower top control pressurer system, preferably, outlet liquid-column height H>=(the △ P of described condenser
1+ △ P
f1+ △ P
2-△ P
3-△ P
f2)/ρ g; Wherein △ P
1for condenser pressure drop, Pa, △ P
f1; △ P
f2the resistance of ducting being respectively overhead condensation pipeline and thermal bypass pipeline is fallen, Pa; △ P
2for the pressure drop of condensate liquid control valve, Pa; △ P
3for stop valve pressure drop, Pa; ρ is condensate liquid density, kg/m
3; G is acceleration of gravity, m/s
2; H is the outlet liquid-column height of condenser, m.Condensate liquid control valve is arranged near return tank as far as possible, and the outlet line of condenser is inserted to bottom return tank preferably by return tank top condensate inlet, and preferably insert below liquid level, now H is the discrepancy in elevation between condensator outlet to return tank high liquid level.If return tank top condensate inlet does not insert below liquid level, H is that condensator outlet to return tank is risen difference or can be considered as roughly being that condensator outlet is to the condensate liquid control valve discrepancy in elevation.According to Bernoulli equation, tower top thermal bypass line pressure is calculated, has P
t-△ P
3-△ P
f2=P
d, wherein P
tfor tower top pressure, P
dfor return tank pressure.Overhead condensation line pressure is calculated, then has P
t-△ P1-△ P
f1-△ P2+ ρ gH
0=P
d, wherein H
0for the liquid-column height calculated, m.When tower top thermal bypass and condensate line all have a Flow of Goods and Materials, tower top falls identical to the two-way pipe resistance of return tank parallel connection, i.e. △ P
3+ △ P
f2=△ P
1+ △ P
f1+ △ P
2-ρ gH
0, arrange, ρ gH
0=△ P
1+ △ P
f1+ △ P
2-△ P
3-△ P
f2, namely condensate line liquid level pressure reduction can overcome the resistance difference of two-way pipeline, and the liquid-column height H that final design requires is than calculated value H
0bigger, there is certain rich amount, have deviation in case calculate with actual, control to impact to tower top pressure.During pipe arrangement, should also be noted that condensate liquid control valve is arranged near return tank as far as possible, ensure that overhead condenser exports between condensate liquid control valve and has certain liquid level, the liquid level difference formed is depressed into few pressure drop that can overcome condensate liquid control valve, such liquid can flow in return tank smoothly, and modulability is better.
In above-mentioned thermal bypass rectifying tower top control pressurer system, preferably, described condenser is air cooler, water cooler or other type condenser.
In thermal bypass tower top pressure control system, the determination of thermal bypass caliber is the key factor that tower pressure-controlled is stable.Many situations are because thermal bypass pipeline bore is chosen unreasonable and causes tower pressing system abnormal.In thermal bypass pipeline, the flow of material is tried to achieve by following heat content equilibrium equation, determines suitable caliber again according to this flow: X=(H3-H2)/(H1-H2), in formula: H1 is the enthalpy of the overhead gas entering condenser, kJ/kg; H2 is the enthalpy of condensator outlet subcooled liquid, kJ/kg; H3 is the liquid enthalpy under the saturation temperature corresponding to return tank design pressure, kJ/kg; X is thermal bypass flow rate, accounts for the ratio of overhead gas.
When implementing thermal bypass control pressurer system of the present utility model, when tower top pressure raises, condensate liquid control valve is opened greatly, and condensation number increases, and condensation rate increases, and tower pressure drop is low; When tower top pressure reduces, condensate liquid control valve turns down, and condensation number reduces, and condensation rate reduces, thus tower voltage rise is high.By when pressure oscillation, change condensate liquid control valve aperture, regulate condensation number, to reach the effect of stabilizer pressure.Condensate liquid was cold when leaving condenser, condensate liquid enters the bottom of return tank, thermal bypass gas enters from the top of return tank, the condensation in return tank of so a part of thermal bypass gas, on gas-liquid interface, just set up the liquid film of thin layer, the temperature of this liquid film is higher than the body temperature of return tank liquid.Gas in this liquid film and return tank reaches one and balances each other, thus realizes the Stress control to tower top.
In thermal bypass control pressurer system of the present utility model, the outlet line of overhead condenser is provided with control valve with controlled pressure, and thermal bypass pipeline is provided with stop valve.The effect of stop valve on thermal bypass pipeline, one turns down this valve when being and going into operation contributes to setting up return tank liquid level; Two is when the suction line resistance drop of overhead condenser is larger, and by turning down this stop valve, increase gas phase pressure-drop in pipeline, two-way pipe resistance is fallen can be mated better, adds operating flexibility.
Thermal bypass tower top pressure control system of the present utility model establishes a thermal bypass pipeline to be connected to return tank of top of the tower in rectifying tower top, tower top small part gas phase enters return tank top through thermal bypass pipeline, major part gas phase enters bottom return tank after overhead condenser condensation, the outlet line of condenser is arranged condensate liquid control valve, its aperture is regulated by tower top pressure, thus control condensation rate, thermal bypass pipeline is only provided with a stop valve and control valve is not set, two-way pipe resistance is fallen can mate better, finally reach the effect of stabilizer pressure.
In petroleum and chemical industry Rectification Tower Design, often have the full condensation of overhead product, tower needs the situation of pressurized operation, and this situation can adopt tower top pressure control system of the present utility model.To seal with nitrogen or compared with the control mode such as other sealing gland, tower top pressure control system of the present utility model does not have the consumption of sealing gas.If product purity requires higher, adopt nitrogen or other gas control tower pressure on top surface can cause the situation of certain influence to product purity, adopt the advantage of thermal bypass tower top pressure control system of the present utility model then more outstanding.
Control valve is arranged on cool condenser outlet line by thermal bypass rectifying tower top control pressurer system of the present utility model, and thermal bypass pipeline is no longer arranged control valve stop valve is only set, its advantage mainly comprises: control valve moves on condensator outlet pipeline, size is less, temperature is lower, and the control valve eliminated on thermal bypass pipeline, investment reduction; Pipe arrangement distance is shorter, reduces pipe resistance and falls, if the overhead condenser outlet liquid phase discrepancy in elevation is enough, stop valve on thermal bypass pipeline can standard-sized sheet, tower top pressure can think roughly consistent with return tank pressure, can reduce the operating pressure of tower like this, thus reduces the operation energy consumption of tower; Equipment can be arranged by height on earth by flow process, more smooth and easy, can with device in adopt the tower system style of other control pressurer system unified.
Accompanying drawing explanation
Fig. 1 is a kind of structural representation of traditional thermal bypass rectifying tower top control pressurer system.
Fig. 2 is the structural representation of another kind of traditional thermal bypass rectifying tower top control pressurer system.
Fig. 3 is the structural representation of thermal bypass rectifying tower top control pressurer system of the present utility model.
Primary clustering symbol description:
Thermal bypass pipeline 1 hot vapor bypass control valve 2 return tank 3 condenser 4 rectifying column 5 condensate liquid control valve 6 stop valve 7 reflux pump 8
Detailed description of the invention
In order to there be understanding clearly to technical characteristic of the present utility model, object and beneficial effect, existing following detailed description is carried out to the technical solution of the utility model, but can not be interpreted as to of the present utility model can the restriction of practical range.
In a detailed description of the invention, thermal bypass rectifying tower top control pressurer system of the present utility model is applied to a certain object fractionating column pressure on top surface and controls, and this tower is used for separation and obtains the products such as gasoline, diesel oil, wax oil, does not have light component, the full condensation of tower top in tower charging.
As shown in Figure 3, this thermal bypass rectifying tower top control pressurer system comprises: thermal bypass pipeline 1, stop valve 7, condenser 4, condensate liquid control valve 6, return tank 3 and reflux pump 8; Wherein, the entrance of condenser 4 is connected to rectifying column 5 tower top discharging opening by pipeline, the outlet of condenser 4 is connected to return tank 3 top condensate inlet by pipeline and is provided with condensate liquid control valve 6 on this pipeline, and described condensate liquid control valve 6 is near described return tank 3; One end of thermal bypass pipeline 1 is connected to by threeway the pipeline that condenser 4 is connected with rectifying column 5, and the other end of thermal bypass pipeline 1 is connected to thermal bypass gas access, return tank 3 top, and is provided with stop valve 7 on this thermal bypass pipeline 1; Return tank 3 outlet at bottom is connected to rectifying column 5 tower top material reflux inlet by pipeline, and is provided with reflux pump 8 on this pipeline; The top of return tank 3 is provided with return tank Stress control pipeline.Overhead product pipeline can be connected to by threeway the pipeline be connected with rectifying column 5 tower top bottom return tank 3.
In the present embodiment, consider for fire safety, if tower top has fixed gas not allow directly to discharge air, need to enter flare system, the operating pressure of return tank is decided to be 0.05MPa, and overhead condensation adopts air cooler.Because tower top thermal bypass pipe resistance falls with condensate line line length suitable, hundred meters of resistance drops are more or less the same, and calculate for simplifying, overhead condensation line and thermal bypass line resistance drop are cancelled out each other and disregarded, and on thermal bypass pipeline, during stop valve standard-sized sheet, resistance is less, also ignores.After calculating, thermal bypass amount accounts for 12% of tower overhead gas phasor, air cooler pressure drop 21.1kPa, condensate liquid control valve pressure drop 15kPa, condensate liquid density 709kg/m
3, condensator outlet liquid-column height is minimum is 5.19m, and under this project return tank inlet tube does not insert liquid level, when finally determining pipe arrangement, condensate liquid control valve is arranged near return tank as far as possible, and air cooler is exported to the condensate liquid control valve discrepancy in elevation and is not less than 6m.
When implementing, when tower top pressure raises, condensate liquid control valve is opened greatly, and condensation number increases, and condensation rate increases, and tower pressure drop is low; When tower top pressure reduces, condensate liquid control valve turns down, and condensation number reduces, and condensation rate reduces, thus tower voltage rise is high.By when pressure oscillation, change condensate liquid control valve aperture, regulate condensation number, to reach the effect of stabilizer pressure.The effect of stop valve on thermal bypass pipeline, one turns down this valve when being and going into operation contributes to setting up return tank liquid level; Two is when the suction line resistance drop of overhead condenser is larger, and by turning down this stop valve, increase gas phase pressure-drop in pipeline, two-way pipe resistance is fallen can be mated better.
Claims (5)
1. a thermal bypass rectifying tower top control pressurer system, is characterized in that, this system at least comprises: thermal bypass pipeline, stop valve, condenser, condensate liquid control valve, return tank and reflux pump; Wherein, the entrance of condenser is connected to rectifying tower top discharging opening by pipeline, and the outlet of condenser is connected to return tank top condensate inlet by pipeline and is provided with condensate liquid control valve on this pipeline;
One end of thermal bypass pipeline is connected to by threeway the pipeline that condenser is connected with rectifying column, and the other end of thermal bypass pipeline is connected to thermal bypass gas access, return tank top, and is provided with stop valve on this thermal bypass pipeline;
Return tank outlet at bottom is connected to rectifying column tower top feed back entrance by pipeline, and is provided with reflux pump on this pipeline;
The top of return tank is provided with return tank Stress control pipeline.
2. thermal bypass rectifying tower top control pressurer system according to claim 1, is characterized in that, outlet liquid-column height H>=(the △ P of described condenser
1+ △ P
f1+ △ P
2-△ P
3-△ P
f2)/ρ g; Wherein △ P
1for condenser pressure drop, Pa; △ P
f1, △ P
f2the resistance of ducting being respectively overhead condensation pipeline and thermal bypass pipeline is fallen, Pa; △ P
2for the pressure drop of condensate liquid control valve, Pa; △ P
3for stop valve pressure drop, Pa; ρ is condensate liquid density, kg/m
3; G is acceleration of gravity, m/s
2.
3. thermal bypass rectifying tower top control pressurer system according to claim 1, is characterized in that, described condensate liquid control valve is near described return tank.
4. thermal bypass rectifying tower top control pressurer system according to claim 1, is characterized in that, the outlet line of described condenser is inserted to bottom return tank by return tank top condensate inlet.
5. thermal bypass rectifying tower top control pressurer system according to claim 1, is characterized in that, described condenser is air cooler or water cooler.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420715326.8U CN204233807U (en) | 2014-11-25 | 2014-11-25 | A kind of thermal bypass rectifying tower top control pressurer system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420715326.8U CN204233807U (en) | 2014-11-25 | 2014-11-25 | A kind of thermal bypass rectifying tower top control pressurer system |
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| Publication Number | Publication Date |
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| CN204233807U true CN204233807U (en) | 2015-04-01 |
Family
ID=52763363
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| CN201420715326.8U Active CN204233807U (en) | 2014-11-25 | 2014-11-25 | A kind of thermal bypass rectifying tower top control pressurer system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105589352A (en) * | 2016-03-08 | 2016-05-18 | 北京国电龙源环保工程有限公司 | Parallel control system of vapor recompression equipment and control method thereof |
| CN109603186A (en) * | 2018-12-14 | 2019-04-12 | 北京世纪隆博科技有限责任公司 | A kind of rectifying tower top temperature and return tank liquid level decoupling control method |
| CN110508022A (en) * | 2019-10-11 | 2019-11-29 | 唐山三孚电子材料有限公司 | The device and method of on-condensible gas control rectifying tower pressure is not utilized |
-
2014
- 2014-11-25 CN CN201420715326.8U patent/CN204233807U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105589352A (en) * | 2016-03-08 | 2016-05-18 | 北京国电龙源环保工程有限公司 | Parallel control system of vapor recompression equipment and control method thereof |
| CN109603186A (en) * | 2018-12-14 | 2019-04-12 | 北京世纪隆博科技有限责任公司 | A kind of rectifying tower top temperature and return tank liquid level decoupling control method |
| CN110508022A (en) * | 2019-10-11 | 2019-11-29 | 唐山三孚电子材料有限公司 | The device and method of on-condensible gas control rectifying tower pressure is not utilized |
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