CN204727794U - For adjusting the system of ethylene yield - Google Patents
For adjusting the system of ethylene yield Download PDFInfo
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- CN204727794U CN204727794U CN201520275848.5U CN201520275848U CN204727794U CN 204727794 U CN204727794 U CN 204727794U CN 201520275848 U CN201520275848 U CN 201520275848U CN 204727794 U CN204727794 U CN 204727794U
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Abstract
The utility model provides a kind of system for adjusting ethylene yield, comprise: rectifying tower (1) and be connected to the cyclic ethylene pipeline (2) at rectifying tower (1) top, wherein, the tower top of rectifying tower (1) is provided with pressure unit (3), be in series with cyclic ethylene pipeline variable valve (4) in cyclic ethylene pipeline (2), and pressure unit (3) is electrically connected with cyclic ethylene pipeline variable valve (4).The purpose of this utility model is to provide a kind of system for adjusting ethylene yield, at least to realize the operation of stable ethylene distillation, to guarantee ethylene product quality, ethylene yield can be adjusted flexibly again simultaneously, reduce the investment of ethene storage facility, avoid the waste of ethene resource.
Description
Technical field
The utility model relates to a kind of system for adjusting ethylene yield.
Background technology
In existing distillation system, when the demand of the gas-phase product obtained carrying out rectifying has larger change, frequently by adjustment, it is derived flow and adapts to this demand.But this method probably causes the change of the tower top internal pressure of rectifying tower, thus affect the stability of rectifying tower operation, and then have influence on the quality of gas-phase product.
Such as, in preparing propylene from methanol (MTP) technique, if downstream is supporting device ethylene requirements amount being existed to larger change, such as polypropylene plant, this process control schemes just shows fatal defect.Because the different polypropylene trades mark requires that the ethene adding different ratios is as comonomer, there is change by a relatively large margin to the demand of ethene in polypropylene plant, this just requires that the ethylene product output of MTP output and polypropylene plant demand match.When downstream matching requirements changes ethylene feed load, ethylene product flow changes, the change of Rectification column pressure.The pressure of ethylene rectification tower is an important parameter in ethylene distillation operation, the change of tower pressure will cause the change of vapor-liquid equilibrium condition on gas phase flow rate and column plate in tower, result can make operational condition change, and has influence on the quality of product the most at last, destroys the stability of rectifying tower operation.
For above-mentioned situation, process aspect adopts two schemes traditionally:
Scheme one, the load of adjustment whole system.The program, technologist is needed to carry out setting again to the parameter of whole Controlling System, again adjust, complex operation, and ethylene distillation system has less turndown ratio, if polypropylene plant exists change by a relatively large margin to ethylene requirements amount, be also difficult to realize processing requirement even if change Controlling System parameter.
Scheme two, does not change ethene quantum of output, is undertaken cushioning, allocating by the excessive ethylene product of output by storing and transporting system.And due to ethene boiling point extremely low and there is the characteristics such as inflammable, explosive, condition of storage is harsh and storage cost is expensive.
Utility model content
For Problems existing in correlation technique, the purpose of this utility model is to provide a kind of system for adjusting ethylene yield, at least to realize the operation of stable ethylene distillation, to guarantee ethylene product quality, ethylene yield can be adjusted flexibly again simultaneously, reduce the investment of ethene storage facility, avoid the waste of ethene resource.
For achieving the above object, the utility model provides a kind of system for adjusting ethylene yield, comprise: rectifying tower and the cyclic ethylene pipeline being connected to rectifying tower top, wherein, the tower top of rectifying tower is provided with pressure unit, be in series with cyclic ethylene pipeline variable valve in cyclic ethylene pipeline, and pressure unit is electrically connected with cyclic ethylene pipeline variable valve.
According to the utility model, also comprise the return tank with reflux inlet and bypass outlet, wherein, rectifying tower top is communicated with reflux inlet by reflux inlet pipeline, and bypass outlet is communicated with rectifying tower sidewall by bypass outlet pipeline.
According to the utility model, in bypass outlet pipeline, be connected with ethylene product pipeline, wherein, in ethylene product pipeline, be in series with the flow regulator of band variable valve.
According to the utility model, be in series with condenser in reflux inlet pipeline, wherein, condenser is provided with cryogen inflow pipe, cryogen inflow pipe is in series with flow control valve, is provided with liquid level emasuring device in return tank, wherein, liquid level emasuring device is electrically connected with flow control valve.
According to the utility model, be provided with quantity of reflux setting control power element in the pipeline section that bypass outlet pipeline is communicated with rectifying tower sidewall, wherein, quantity of reflux setting control power element is configured to the variable valve that can carry out quantity of reflux adjustment.
According to the utility model, in bypass outlet pipeline, be also in series with reflux pump.
According to the utility model, rectifying tower sidewall is also provided with feeding pipe, wherein, is in series with inlet amount setting control power element in feeding pipe, and inlet amount setting control power element is configured to the variable valve that can carry out inlet amount adjustment.
According to the utility model, pressure unit is all electrically connected with the pressure control system setter be arranged in DCS system with cyclic ethylene pipeline variable valve, wherein, pressure unit is electrically connected with the Analog input mModule of pressure control system setter, and the signal output part of pressure control system setter is electrically connected with the Valve positioner of cyclic ethylene pipeline variable valve.
According to the utility model, cyclic ethylene pipeline variable valve is for regulating ball valve.
According to the utility model, flow regulator is configured to be connected with the proportional integral adjustment module in DCS system, flow regulator with variable valve be configured to regulate ball valve.
Advantageous Effects of the present utility model is:
In the utility model, provide the system for adjusting ethylene yield, by increasing the tower top pressure regulation system be made up of pressure unit and cyclic ethylene pipeline variable valve, fine adjustment is carried out to the cyclic ethylene be used as beyond product ethene, ensure the Recycling and reuse of Excess ethylene, solve the problem that cannot regulate ethylene product load in original control program, realize ethylene yield accurate adjustment in designed capacity 0 ~ 100% load range, flexible adaptation downstream unit is to the demand of ethene.Simultaneously comparatively traditional technology control program is compared, not only when stable operation without the need to changing the load of rectifying tower system, also reduce the dependence to ethene storage facility, cost-saving.
In addition, stablizing Rectification column pressure by arranging pressure proper value regulating in cyclic ethylene pipeline, eliminating the disturbance of tower pressure to the impact of rectifying tower operational stability and product purity.When upstream device requires to change to ethylene yield, change the set(ting)value of flow regulator on ethylene product pipeline, change the aperture of variable valve on ethylene product pipeline, and then change ethylene product flow, because inlet amount and quantity of reflux adopt fixed set point control system, produced quantity changes and causes return tank liquid level to change, by regulating cryogen stability of flow return tank liquid level in cryogen inflow pipe.Now, tower pressure can be caused to change because condensation number changes, tower top pressure regulates adoption rate integral control, remaining poor in QA elimination simultaneously, by regulating cyclic ethylene flow, effectively ensure that tower pressure, while stable rectifying tower operation ensures quality product, according to downstream, ethene flow is changed to the requirement of ethylene yield, achieve the technological process of adjustment ethylene yield flexibly.
Accompanying drawing explanation
Fig. 1 is that the utility model is for adjusting the structural representation of the system of ethylene yield.
Embodiment
Now by reference to the accompanying drawings the utility model is described.As shown in Figure 1, illustrate for the utility model is for adjusting the structural representation of the system of ethylene yield, this system comprises rectifying tower 1 and is connected to the cyclic ethylene pipeline 2 at rectifying tower 1 top.
More specifically, the tower top of rectifying tower 1 is provided with pressure unit 3, and is in series with cyclic ethylene pipeline variable valve 4 in cyclic ethylene pipeline 2, and pressure unit 3 is electrically connected with cyclic ethylene pipeline variable valve 4 in addition.
Continue with reference to Fig. 1, in a preferred embodiment, system of the present utility model also comprises the return tank 5 with reflux inlet and bypass outlet.For return tank 5, reflux inlet is communicated with rectifying tower 1 top by reflux inlet pipeline 6, and bypass outlet is communicated with rectifying tower 1 sidewall by bypass outlet pipeline 7.In bypass outlet pipeline 7, be connected with ethylene product pipeline 8, and in ethylene product pipeline 8, be also in series with the flow regulator 9 of band variable valve.
In addition in a preferred embodiment, condenser 10 is in series with in reflux inlet pipeline 6.Particularly, condenser 10 is provided with cryogen inflow pipe 11, and cryogen inflow pipe 11 is in series with flow control valve, is provided with liquid level emasuring device 12 and liquid level emasuring device 12 is electrically connected with flow control valve in return tank.
In a preferred embodiment, be provided with quantity of reflux setting control power element 13 in the pipeline section that bypass outlet pipeline 7 is communicated with rectifying tower 1 sidewall, and quantity of reflux setting control power element 13 is configured to the variable valve that can carry out quantity of reflux adjustment.With accordingly above-mentioned, the sidewall of rectifying tower 1 is also provided with feeding pipe 15, is in series with inlet amount setting control power element 16 in feeding pipe 15, and inlet amount setting control power element 16 is configured to the variable valve that can carry out inlet amount adjustment.In addition in an alternate embodiment of the invention, reflux pump 14 can also be in series with in bypass outlet pipeline 7.
In concrete application, pressure unit 3 and cyclic ethylene pipeline variable valve 4 all be arranged on the intrasystem pressure control system setter of DCS (distributed AC servo system) and be electrically connected, wherein, pressure unit 3 is electrically connected with the Analog input mModule of pressure control system setter, and the signal output part of pressure control system setter is electrically connected with the Valve positioner of cyclic ethylene pipeline variable valve 4.
In an alternate embodiment of the invention, cyclic ethylene pipeline variable valve 4 can for regulating ball valve.In addition, flow regulator 9 can be configured to be connected with the proportional integral adjustment module in DCS system, under meter in flow regulator 9 can selected range than the Mass Flow Meter be such as 100:1, flow meter signal is delivered in DCS system, DCS system by control signal output with regulated valve.In addition, this flow regulator 9 with above-mentioned variable valve can be configured to regulate ball valve.Specifically, flow regulator 9 entirety can be made up of Valve positioner and above-mentioned variable valve as power element, wherein Valve positioner is connected with the proportional integral adjustment module signal in DCS system thus receives all kinds of executive signals that DCS system sends, and Valve positioner is also connected with variable valve thus carrys out the adjustment of regulating and controlling valve opening according to above-mentioned executive signal simultaneously.
Now in conjunction with said structure and the accompanying drawing of the utility model system, the control process of the utility model for the system adjusting ethylene yield is described.Should be understood that, the part be not described in FIG, parts or equipment and Controlling System of the prior art same or similar, therefore these parts, parts or equipment are not described in detail in the utility model.
As shown in Figure 1, ethene, ethane parallel feeding enter ethylene rectification tower 1 by certain flow by feeding pipe 15, ethene is steamed from ethylene rectification tower 1 tower top, this Ethylene vapor part enters return tank 5 after condenser 10 all condensation, and liquid phase ethylene at the bottom of the tank of return tank 5 is undertaken refluxing and carrying out ethylene product extraction by ethylene product pipeline 8 by bypass outlet pipeline 7; Rest part ethylene gas is returned the MTP reactor of the utility model system front portion after subsequent recovery cold by cyclic ethylene pipeline 2 as cyclic ethylene, be converted into propylene through methanation reaction process.
In based on above-mentioned prior art Controlling System basis on, the utility model has newly increased the pressure regulating system be made up of pressure unit 3 and cyclic ethylene pipeline variable valve 4.Pressure unit 3 is installed on rectifying tower 1 tower top, thus can fast direct ground connection reaction tower pressure, and tower pressure value is converted to the analog quantity current value such as within the scope of 4 ~ 20mA and sends into the Analog input mModule of DCS system by further pressure unit 3.
Further, pressure control system setter is provided with in DCS system, the controlled plant of gaseous tension is Dan Rong, have self-balance ability and time constant is less, therefore above-mentioned pressure control system setter does not need derivative element, in addition because tower pressure-controlled requires do not have remaining difference, so tower pressure adjustment control can adoption rate integral adjustment.
In a preferred embodiment, for the cyclic ethylene pipeline variable valve 4 on cyclic ethylene pipeline 2, this variable valve can select such as regulating ratio be the wide range ratio of 200:1 V-type regulate ball valve, 4 ~ 20mA signal that controller exports exports in the Valve positioner of cyclic ethylene pipeline variable valve 4, regulate the flow of cyclic ethylene in cyclic ethylene pipeline 2 by changing valve opening, and then reach the object controlling rectifying tower 1 tower pressure.
Fine adjustment to be realized corresponding under meter in the ethylene product Controlling System of ethylene product pipeline 8, process adds up the function with machine with wide range, therefore need to select the mass flowmeter that precision is higher, range ratio is larger; Ethylene stream adjustable valve for this flow system then to take into account regulate with high regulating ratio scope, therefore the variable valve of flow regulator 9 select such as regulating ratio be the wide range ratio of 200:1 V-type regulate ball valve.In a preferred embodiment, flow regulator 9 can select proportional integral to regulate, and it is with accumulation function.
In the utility model, according to the polypropylene plant of the utility model system downstream to the requirement of ethylene usage, the set(ting)value of flow regulator 9 can be adjusted flexibly according to concrete service condition, thus adjust the ethylene product flow flowed out by ethylene product pipeline 8.
Further, inlet amount setting control power element 16 and quantity of reflux setting control power element 13 are all connected to be carried out presetting of charging value/backflow value by DCS system with the corresponding controllers in DCS system, that is, control to be set as setting control by the default above-mentioned inlet amount/quantity of reflux that makes of DCS system.But according to rectifying tower 1 material balance, the return tank level value measured by liquid level emasuring device 12 of return tank 5 will change, and change rectifying section ethylene product condensation number by adjust flux variable valve, with stable return tank liquid level.The change of condensation number can cause the change of tower pressure in rectifying tower 1, now pressure unit 3 is for ensureing that in rectifying tower 1, tower pressure is stable, change the aperture of cyclic ethylene pipeline variable valve 4 in cyclic ethylene pipeline 2, Excess ethylene is looped back the reactive system of the utility model system front portion by cyclic ethylene pipeline 2, carry out methanation reaction.So while stabilizer tower pressure ensures quality product, achieve the function of adjustment ethylene yield flexibly.
In sum, of the present utility model for adjusting in the system of ethylene yield, by increasing the tower top pressure regulation system be made up of pressure unit 3 and cyclic ethylene pipeline variable valve 4, fine adjustment is carried out to the cyclic ethylene be used as beyond product ethene, ensure the Recycling and reuse of Excess ethylene, solve the problem that cannot regulate ethylene product load in original control program, realize ethylene yield accurate adjustment in designed capacity 0 ~ 100% load range, flexible adaptation downstream unit is to the demand of ethene.Simultaneously comparatively traditional technology control program is compared, not only when stable operation without the need to changing the load of rectifying tower system, also reduce the dependence to ethene storage facility, cost-saving.
In addition, stablizing Rectification column pressure by arranging pressure proper value regulating in ethylene product pipeline 8, eliminating the disturbance of tower pressure to the impact of rectifying tower 1 operational stability and product purity.When upstream device requires to change to ethylene yield, change the set(ting)value of flow regulator 9 on ethylene product pipeline, change the aperture of variable valve on ethylene product pipeline, and then change ethylene product flow, because inlet amount and quantity of reflux adopt fixed set point control system, produced quantity changes and causes return tank 5 liquid level to change, by regulating cryogen stability of flow return tank 5 liquid level in cryogen inflow pipe 11.Now, the tower pressure of rectifying tower 1 can be caused to change because condensation number changes, tower top pressure regulates adoption rate integral control, remaining poor in QA elimination simultaneously, by regulating cyclic ethylene flow, effectively ensure that tower pressure, while stable rectifying tower 1 operates guarantee quality product, according to downstream, ethene flow is changed to the requirement of ethylene yield, achieve the technological process of adjustment ethylene yield flexibly.
The foregoing is only preferred embodiment of the present utility model, be not limited to the utility model, for a person skilled in the art, the utility model can have various modifications and variations.All within spirit of the present utility model and principle, any amendment done, equivalent replacement, improvement etc., all should be included within protection domain of the present utility model.
Claims (10)
1. for adjusting a system for ethylene yield, it is characterized in that, comprising: rectifying tower (1) and be connected to the cyclic ethylene pipeline (2) at described rectifying tower (1) top,
Wherein, the tower top of described rectifying tower (1) is provided with pressure unit (3), be in series with cyclic ethylene pipeline variable valve (4) in described cyclic ethylene pipeline (2), and described pressure unit (3) is electrically connected with described cyclic ethylene pipeline variable valve (4).
2. system according to claim 1, is characterized in that, also comprises the return tank (5) with reflux inlet and bypass outlet,
Wherein, described rectifying tower (1) top is communicated with described reflux inlet by reflux inlet pipeline (6), and described bypass outlet is communicated with described rectifying tower (1) sidewall by bypass outlet pipeline (7).
3. system according to claim 2, is characterized in that, is connected with ethylene product pipeline (8) in described bypass outlet pipeline (7),
Wherein, the flow regulator (9) of band variable valve is in series with in described ethylene product pipeline (8).
4. the system according to Claims 2 or 3, is characterized in that, is in series with condenser (10) in described reflux inlet pipeline (6),
Wherein, described condenser (10) is provided with cryogen inflow pipe (11), described cryogen inflow pipe (11) is in series with flow control valve, is provided with liquid level emasuring device (12) in described return tank,
Wherein, described liquid level emasuring device (12) is electrically connected with described flow control valve.
5. the system according to Claims 2 or 3, is characterized in that, is provided with quantity of reflux setting control power element (13) in the pipeline section that described bypass outlet pipeline (7) is communicated with described rectifying tower (1) sidewall,
Wherein, described quantity of reflux setting control power element (13) is configured to the variable valve that can carry out quantity of reflux adjustment.
6. system according to claim 5, is characterized in that, in described bypass outlet pipeline (7), be also in series with reflux pump (14).
7. the system according to Claims 2 or 3, is characterized in that, described rectifying tower (1) sidewall is also provided with feeding pipe (15),
Wherein, be in series with inlet amount setting control power element (16) in described feeding pipe (15), described inlet amount setting control power element (16) is configured to the variable valve that can carry out inlet amount adjustment.
8. system according to claim 1, is characterized in that, described pressure unit (3) is all electrically connected with the pressure control system setter be arranged in DCS system with described cyclic ethylene pipeline variable valve (4),
Wherein, described pressure unit (3) is electrically connected with the Analog input mModule of described pressure control system setter, and the signal output part of described pressure control system setter is electrically connected with the Valve positioner of described cyclic ethylene pipeline variable valve (4).
9. the system according to any one of claim 1,2,3,8, is characterized in that, described cyclic ethylene pipeline variable valve (4) is for regulating ball valve.
10. system according to claim 3, it is characterized in that, described flow regulator (9) is configured to be connected with the proportional integral adjustment module in DCS system, described flow regulator (9) with variable valve be configured to regulate ball valve.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520275848.5U CN204727794U (en) | 2015-04-30 | 2015-04-30 | For adjusting the system of ethylene yield |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201520275848.5U CN204727794U (en) | 2015-04-30 | 2015-04-30 | For adjusting the system of ethylene yield |
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| CN204727794U true CN204727794U (en) | 2015-10-28 |
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| CN201520275848.5U Active CN204727794U (en) | 2015-04-30 | 2015-04-30 | For adjusting the system of ethylene yield |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104844407A (en) * | 2015-04-30 | 2015-08-19 | 中国石油集团东北炼化工程有限公司吉林设计院 | System for adjusting ethylene output |
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2015
- 2015-04-30 CN CN201520275848.5U patent/CN204727794U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104844407A (en) * | 2015-04-30 | 2015-08-19 | 中国石油集团东北炼化工程有限公司吉林设计院 | System for adjusting ethylene output |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20201009 Address after: 132002 3-6 and 9-13 floors of Block A, Jihua Economic and Trade Center, Tongtan Road, Changyi District, Jilin Province Patentee after: PetroChina Jilin Chemical Engineering Co.,Ltd. Address before: 132002, Jilin, Jilin Province tung Chi Road East Economic and Trade Building Patentee before: JILIN DESIGNING INSTITUTE OF CNPC NORTHEAST REFINING & CHEMICAL ENGINEERING Co.,Ltd. |
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| TR01 | Transfer of patent right |