CN202215452U - Device for preventing chilling water pump from cavitating in coal-based methanol to propylene process - Google Patents
Device for preventing chilling water pump from cavitating in coal-based methanol to propylene process Download PDFInfo
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- CN202215452U CN202215452U CN 201120230335 CN201120230335U CN202215452U CN 202215452 U CN202215452 U CN 202215452U CN 201120230335 CN201120230335 CN 201120230335 CN 201120230335 U CN201120230335 U CN 201120230335U CN 202215452 U CN202215452 U CN 202215452U
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- Prior art keywords
- quenching column
- pipeline
- water
- preparatory
- heavy hydrocarbon
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 95
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 title claims abstract description 45
- 238000000034 method Methods 0.000 title claims abstract description 21
- 125000004805 propylene group Chemical group [H]C([H])([H])C([H])([*:1])C([H])([H])[*:2] 0.000 title claims abstract description 16
- 239000003245 coal Substances 0.000 title claims abstract description 14
- QQONPFPTGQHPMA-UHFFFAOYSA-N propylene Natural products CC=C QQONPFPTGQHPMA-UHFFFAOYSA-N 0.000 title claims abstract description 14
- 150000002430 hydrocarbons Chemical class 0.000 claims abstract description 70
- 239000004215 Carbon black (E152) Substances 0.000 claims abstract description 68
- 229930195733 hydrocarbon Natural products 0.000 claims abstract description 68
- 238000010791 quenching Methods 0.000 claims description 96
- 230000000171 quenching effect Effects 0.000 claims description 76
- 238000005516 engineering process Methods 0.000 claims description 13
- 230000000903 blocking effect Effects 0.000 abstract 1
- 239000007788 liquid Substances 0.000 description 7
- 230000015572 biosynthetic process Effects 0.000 description 6
- 238000000926 separation method Methods 0.000 description 6
- 230000006835 compression Effects 0.000 description 4
- 238000007906 compression Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 230000009466 transformation Effects 0.000 description 4
- 238000000605 extraction Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 241000282326 Felis catus Species 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000009191 jumping Effects 0.000 description 1
- 238000010327 methods by industry Methods 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 230000026676 system process Effects 0.000 description 1
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- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
- Production Of Liquid Hydrocarbon Mixture For Refining Petroleum (AREA)
Abstract
The utility model provides a device for preventing a chilling water pump from cavitating in a coal-based methanol to propylene process. The device comprises a pre-chilling tower and a chilling tower, wherein the top of the pre-chilling tower is provided with a chilling water injecting pipeline and a gaseous hydrocarbon leading-out pipeline, the bottom of the pre-chilling tower is provided with a process water leading-out pipeline and a heavy hydrocarbon leading-out pipeline, and the middle part of the pre-chilling tower is provided with a product gas feeding pipeline; the top of the chilling tower is provided with a chilling water injecting pipeline and a gaseous hydrocarbon leading-out pipeline, and the bottom of the chilling tower is provided with a process water leading-out pipeline and a heavy hydrocarbon leading-out pipeline; the gaseous hydrocarbon leading-out pipeline at the top of the pre-chilling tower is communicated with the middle part of the chilling tower; and process water discharge openings at the bottoms of the pre-chilling tower and the chilling tower are respectively provided with an anti-swirl baffle; the bottoms of collector downcomers in the pre-chilling tower and the chilling tower are slightly lower than the interface of water/heavy hydrocarbon; the collector downcomers are provided with blocking plates used for closing bottom openings; and the inner sides of the lower parts of the collector downcomers are provided with discharge grooves. By adopting the device, the problem of cavitation of the chilling water pump in the coal-based methanol to propylene process can be solved, so a chilling system can run smoothly.
Description
Technical field
The utility model relates to coal-based methanol system propylene manufacturing process, more particularly, is a kind of device that prevents Quench pump cavitation in the coal-based methanol system propylene technology.
Background technique
First in the world cover is produced 500000 tons coal-based propylene unit per year, is the trial first of preparing propylene from methanol (MTP) process engineering industrial applications.In the MTP device running, the oil-water separation problem is the bottleneck of puzzlement device smooth running always.Oil-water separation relates generally to quenching column and preparatory quenching column, oxide extraction tower and extraction tower.Wherein quenching column merits attention with the oil-water separation problem of preparatory quenching column most.The bad chilled water pump intake band oil cavitation that possibly cause of quenching column oil-water separation is jumped car, and then causes hydrocarbon compressor inlet temperature height and the accident of jumping car.
The design of Quench system process is considered not enough to needs of production; Analysis for Quench system Quench pump cavitation problem; Mainly contain following 2 reasons: 1) liquid medium gets into the formation vortex that circles round when taking over, and the turbulent flow of formation and eddy flow possibly bring such as unfavorable factors such as pipeline vibrations, and eddy current is brought bubble into; Cause cavitation, reduce pump performance; 2) at the bottom of the straight-through tower of the design of down comer, cause water/heavy hydrocarbon waiting time insufficient, heavy hydrocarbon is brought into chilled water pump intake pipeline, causes the pump cavitation, and then possibly cause full device fluctuation even parking accident.
In order to address the above problem, guarantee the safety and steady operation of coal-based methanol system propylene unit, need adopt an effective measure prevents the cavitation of Quench water pump in the preparing propylene from methanol technology.
Summary of the invention
The purpose of the utility model is: a kind of device that prevents Quench pump cavitation in the coal-based methanol system propylene technology is provided.
The utility model provided is used for preventing that the device of coal-based methanol system propylene technology Quench pump cavitation from comprising:
A preparatory quenching column, the top of this preparatory quenching column are provided with chilled water and inject the gentle attitude hydrocarbon of pipeline and draw pipeline, and the bottom is provided with that process water is drawn pipeline and heavy hydrocarbon is drawn pipeline, and the middle part is provided with product gas feeding line;
A quenching column, the top of this quenching column are provided with chilled water and inject the gentle attitude hydrocarbon of pipeline and draw pipeline, and the bottom is provided with that process water is drawn pipeline and heavy hydrocarbon is drawn pipeline; The gaseous hydrocarbon at said preparatory quenching column top is drawn pipeline and is communicated with said quenching column middle part;
Wherein, the process water exhaust port place of said preparatory quenching column and quenching column bottom is provided with anti-swirl baffle respectively; The bottom of the trap down comer in said preparatory quenching column and the quenching column is a little less than water/heavy hydrocarbon interface, and the trap down comer is provided with the closure plate that is used for the closed bottom outlet, and trap down comer lower inside fluting.
In the utility model; The formation vortex circles round when liquid medium gets into preparatory quenching column and the adapter of quenching column bottom; And then avoid in the interior liquid level upper gas possibility of the container suction pump; Reduce pump performance, reduce turbulent flow and possibly bring such as unfavorable factors such as pipeline vibrations, the anti-swirl baffle at the process water exhaust port place bottom preparatory quenching column and the quenching column is transformed with eddy flow.After the transformation, the diameter of quenching column anti-swirl baffle and quenching column diameter ratio are 1: 4-6, the vertical height of anti-swirl baffle and quenching column diameter ratio are 1: 18-20.The diameter of quenching column anti-swirl baffle is 1 with preparatory quenching column diameter ratio in advance: 3-5, the vertical height of anti-swirl baffle is 1 with preparatory quenching column diameter ratio: 12-14.Improved quenching column is ring structure with the preparatory anti-swirl baffle of quenching column, and the inside of said ring structure is provided with two orthogonal dividing plates, and the two ends of dividing plate are fixedly connected with the inwall of said ring structure.
In the utility model,, the trap down comer is transformed according to the hydrodynamic performance of down comer operation and Effect on Performance to column plate itself; To improve flow pattern, select suitable down comer round, increase water/heavy hydrocarbon waiting time; Increase water/heavy hydrocarbon circle position; Avoid heavy hydrocarbon to be brought into chilled water pump intake pipeline, avoid chilled water pump cavitation, and then avoid causing the complete unit fluctuation.
Before technological transformation, the design of trap down comer is at the bottom of the straight-through tower, makes water/heavy hydrocarbon fully separate as yet, and the water that is entrained with heavy hydrocarbon is just by discharge at the bottom of the tower.Thereby cause the part heavy hydrocarbon to be brought into chilled water pump intake pipeline inevitably with water, cause the pump cavitation, and then possibly cause full device fluctuation even parking accident.
In the utility model; Trap down comer in said preparatory quenching column and the quenching column is transformed, and the down comer short transverse is partly excised, and makes the down comer bottom a little less than water/heavy hydrocarbon circle position; For example, the down comer bottom is positioned under water/heavy hydrocarbon circle position 0.5-4 centimetre.The down comer bottom installs closure plate additional, makes water/heavy hydrocarbon mixture directly not arrive at the bottom of the water side tower, avoids heavy hydrocarbon to be brought into chilled water pump intake pipeline with water.At the lower inside fluting of down comer, that is, above closure plate, open some grooves near the equipment center side; For example, be provided with drain tank 4-20, preferred 8-14 along the down comer Vertical direction; Water/heavy hydrocarbon is flowed out by said fluting; Increase water/heavy hydrocarbon waiting time as far as possible, increase water/heavy hydrocarbon circle position, avoid heavy hydrocarbon to be brought into chilled water pump intake pipeline.The quantity that the utility model is slotted for the down comer bottom, shape etc. do not have specific (special) requirements, can calculate through common process and confirm.
Compared with prior art, the utility model obviously improves Quench system oil-water separation to quenching column and the transformation of quenching column anti-swirl baffle and trap down comer in advance, has properly settled finding time, entering the mouth with the problem of oily cavitation of Quench water pump.
Anti-swirl baffle is transformed, and avoids liquid medium to get into the formation vortex that circles round when taking over, reduce that turbulent flow and eddy flow possibly bring such as unfavorable factors such as pipeline vibrations.Anti-swirl baffle can stop the formation eddy current to bring bubble into, avoids pump depletion to cause cavitation.The trap down comer is transformed, and will increase water/heavy hydrocarbon waiting time, effectively reduces heavy hydrocarbon and is brought into chilled water pump intake pipeline, avoids the Quench pump cavitation, and then possibly cause the complete unit fluctuation.
The utility model has solved the problem of Quench system Quench pump cavitation in the coal-based methanol system propylene technology, and tower spare and technological transformation scheme are provided, and the replenishment of process flow process realizes the smooth running of Quench system.
Description of drawings
Fig. 1 is the process flow diagram of Quench system in the coal-based methanol system propylene technology;
Fig. 2 is the structural representation of quenching column;
Fig. 3 is the structural representation of preparatory quenching column;
Fig. 4 is according to the utility model structural representation of anti-swirl baffle preferred embodiment;
Fig. 5 is according to the utility model structural representation of trap down comer preferred embodiment.
Embodiment
Further specify the utility model below in conjunction with accompanying drawing, but therefore the utility model does not receive any restriction.
In coal-based methanol system propylene technology (MTP), quenching column is that the water in the MTP reactor product gas is separated with hydrocarbon compound with the main effect of quenching column in advance.Shown in Fig. 1-3, the MTP reactor outlet product gas that is cooled at first gets into preparatory quenching column 1, and under the effect of the process water that injects from cat head, part water and heavy hydrocarbon are condensed, and arrives tower bottom through trap down comer 7.Water and heavy hydrocarbon form water/heavy hydrocarbon circle position through sedimentation separation.When the liquid level of heavy hydrocarbon exceeded bypass channel 8, heavy hydrocarbon overflowed to the hydrocarbon side, realized that water/heavy hydrocarbon separates.Heavy hydrocarbon is delivered to subsequent compression unit 18 through heavy hydrocarbon discharge pipe 4.The chilled water that said preparatory quenching column bottom water side need be discharged, the anti-swirl baffle 5 of flowing through is after 6 discharges of chilled water transfer line.Gaseous hydrocarbon leaves from preparatory quenching column top, is sent to through gaseous hydrocarbon transfer line 3 and carries out condensation once more in the quenching column 2, and water and heavy hydrocarbon further are condensed.Water and heavy hydrocarbon arrive tower bottom water side through the trap down comer in the quenching column 8, carry out water/heavy hydrocarbon and separate, and water is separated from hydrocarbon.When the liquid level of heavy hydrocarbon exceeded bypass channel 10, heavy hydrocarbon overflowed to the hydrocarbon side, realized that water/heavy hydrocarbon separates.Heavy hydrocarbon is delivered to subsequent compression unit 18 through heavy hydrocarbon discharge pipe 4 '.The chilled water that said quenching column bottom water side need be discharged, the anti-swirl baffle 5 ' of flowing through is after the 6 ' discharge of chilled water transfer line.Gaseous hydrocarbon enters into subsequent compression unit 18 from Quench top of tower pipeline 9.Compression unit mainly is further to remove water in the Quench unit gaseous hydrocarbon, avoids that water removal effect is bad causes except that water pressure for follow-up rectification cell, even possibly cause that water exceeds standard in the product.
Process water also gets into preparatory quenching column and quenching column unlike MTP reactor outlet product gas successively, but is divided into two strands, squeezes into preparatory quenching column and quenching column top by technology water pump 11 respectively through process water pipeline 12 and 13.The water-setting liquid (chilled water) of quenching column and quenching column bottom is carried through Quench water pump 14 through pipeline 6 and 6 ' respectively in advance; Deliver to rectification cell separator reboiler 15 and be used as the use of circulation chilled water; This chilled water finally is cooled in Quench air cooling device 16 and quenching column precooler 17, and most of circuit chilled water is sent in preparatory quenching column and the quenching column again.
After employing the utility model carried out technology and Plant reconstruction plant modernization, the structure of anti-swirl baffle was as shown in Figure 4.The diameter of quenching column anti-swirl baffle and quenching column diameter ratio are 1: 4-6, the vertical height of anti-swirl baffle and quenching column diameter ratio are 1: 18-20.The diameter of quenching column anti-swirl baffle is 1 with preparatory quenching column diameter ratio in advance: 3-5, the vertical height of anti-swirl baffle is 1 with preparatory quenching column diameter ratio: 12-14.Improved quenching column is ring structure with the preparatory anti-swirl baffle of quenching column, and the inside of said ring structure is provided with two orthogonal dividing plates 20, and the two ends of dividing plate are fixedly connected with the inwall of said ring structure.After anti-swirl baffle is transformed, can stop the formation eddy current to bring bubble into, avoid pump depletion to cause cavitation.
Before employing the utility model carries out technology and Plant reconstruction plant modernization; At the bottom of the straight-through tower of the design of trap down comer (shown in dotted line among Fig. 2-3); Make water/heavy hydrocarbon fully not separate, just by discharging at the bottom of the tower, heavy hydrocarbon is brought into chilled water pump intake pipeline with water to water; Cause the pump cavitation, and then possibly cause full device fluctuation even parking accident.After employing the utility model carries out technology and Plant reconstruction plant modernization; As shown in Figure 5; The down comer short transverse is partly excised, make the down comer bottom a little less than water/heavy hydrocarbon circle position, the bottom installs closure plate 19 additional; Make water/heavy hydrocarbon mixture directly not arrive at the bottom of the water side tower, avoid heavy hydrocarbon to be brought into chilled water pump intake pipeline with water.Some grooves 21 are opened near the equipment center side in the closure plate top, and water/heavy hydrocarbon is gone out by some concentrated flows of increase, increases water/heavy hydrocarbon waiting time as far as possible, increase water/heavy hydrocarbon circle position, avoid heavy hydrocarbon to be brought into chilled water pump intake pipeline.
Claims (6)
1. device that prevents Quench pump cavitation in the coal-based methanol system propylene technology, this device comprises:
A preparatory quenching column, the top of this preparatory quenching column are provided with chilled water and inject the gentle attitude hydrocarbon of pipeline and draw pipeline, and the bottom is provided with that process water is drawn pipeline and heavy hydrocarbon is drawn pipeline, and the middle part is provided with product gas feeding line;
A quenching column, the top of this quenching column are provided with chilled water and inject the gentle attitude hydrocarbon of pipeline and draw pipeline, and the bottom is provided with that process water is drawn pipeline and heavy hydrocarbon is drawn pipeline; The gaseous hydrocarbon at said preparatory quenching column top is drawn pipeline and is communicated with said quenching column middle part;
It is characterized in that the process water exhaust port place of said preparatory quenching column and quenching column bottom is provided with anti-swirl baffle respectively; The bottom of the trap down comer in said preparatory quenching column and the quenching column is a little less than water/heavy hydrocarbon interface, and the trap down comer is provided with the closure plate that is used for the closed bottom outlet, and trap down comer lower inside is provided with drain tank.
2. device according to claim 1 is characterized in that, the diameter of said preparatory quenching column anti-swirl baffle is 1 with preparatory quenching column diameter ratio: 3-5, the vertical height of anti-swirl baffle is 1 with preparatory quenching column diameter ratio: 12-14.
3. device according to claim 2 is characterized in that, the diameter of said quenching column anti-swirl baffle and quenching column diameter ratio are 1: 4-6, the vertical height of anti-swirl baffle and quenching column diameter ratio are 1: 18-20.
4. device according to claim 3; It is characterized in that; Said quenching column is ring structure with the preparatory anti-swirl baffle of quenching column, and the inside of said ring structure is provided with two orthogonal dividing plates, and the two ends of dividing plate are fixedly connected with the inwall of said ring structure.
5. device according to claim 4 is characterized in that, above said trap down comer closure plate, is provided with drain tank 4-20 along the down comer Vertical direction.
6. device according to claim 5 is characterized in that, above said trap down comer closure plate, is provided with drain tank 8-14 along the down comer Vertical direction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201120230335 CN202215452U (en) | 2011-06-30 | 2011-06-30 | Device for preventing chilling water pump from cavitating in coal-based methanol to propylene process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201120230335 CN202215452U (en) | 2011-06-30 | 2011-06-30 | Device for preventing chilling water pump from cavitating in coal-based methanol to propylene process |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202215452U true CN202215452U (en) | 2012-05-09 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201120230335 Expired - Lifetime CN202215452U (en) | 2011-06-30 | 2011-06-30 | Device for preventing chilling water pump from cavitating in coal-based methanol to propylene process |
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| Country | Link |
|---|---|
| CN (1) | CN202215452U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102345578A (en) * | 2011-06-30 | 2012-02-08 | 神华集团有限责任公司 | Method and device used for preventing cavitation of chilling water pump in process of preparing propylene from coal-based methanol |
-
2011
- 2011-06-30 CN CN 201120230335 patent/CN202215452U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102345578A (en) * | 2011-06-30 | 2012-02-08 | 神华集团有限责任公司 | Method and device used for preventing cavitation of chilling water pump in process of preparing propylene from coal-based methanol |
| CN102345578B (en) * | 2011-06-30 | 2014-09-03 | 神华集团有限责任公司 | Method and device used for preventing cavitation of chilling water pump in process of preparing propylene from coal-based methanol |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20120509 |