CN203469519U - Rectifying tower circulating system for removing light fraction coking in reboiler through intermittent forced convection - Google Patents
Rectifying tower circulating system for removing light fraction coking in reboiler through intermittent forced convection Download PDFInfo
- Publication number
- CN203469519U CN203469519U CN201320620654.5U CN201320620654U CN203469519U CN 203469519 U CN203469519 U CN 203469519U CN 201320620654 U CN201320620654 U CN 201320620654U CN 203469519 U CN203469519 U CN 203469519U
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- China
- Prior art keywords
- reboiler
- tower
- knockout tower
- separating
- circulating pump
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- Expired - Lifetime
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- 238000004939 coking Methods 0.000 title claims abstract description 17
- 239000000463 material Substances 0.000 claims description 23
- 238000000605 extraction Methods 0.000 claims description 9
- 238000001704 evaporation Methods 0.000 claims description 2
- 238000007599 discharging Methods 0.000 abstract 3
- 230000002035 prolonged effect Effects 0.000 abstract 2
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 description 24
- 238000000034 method Methods 0.000 description 9
- 238000006116 polymerization reaction Methods 0.000 description 9
- 230000000694 effects Effects 0.000 description 8
- 230000008569 process Effects 0.000 description 8
- 239000007788 liquid Substances 0.000 description 4
- 239000002994 raw material Substances 0.000 description 4
- 238000007670 refining Methods 0.000 description 4
- BZLVMXJERCGZMT-UHFFFAOYSA-N Methyl tert-butyl ether Chemical compound COC(C)(C)C BZLVMXJERCGZMT-UHFFFAOYSA-N 0.000 description 3
- 150000001336 alkenes Chemical class 0.000 description 3
- 238000009835 boiling Methods 0.000 description 3
- 230000007423 decrease Effects 0.000 description 3
- JRZJOMJEPLMPRA-UHFFFAOYSA-N olefin Natural products CCCCCCCC=C JRZJOMJEPLMPRA-UHFFFAOYSA-N 0.000 description 3
- 238000007789 sealing Methods 0.000 description 3
- 238000000926 separation method Methods 0.000 description 3
- KAKZBPTYRLMSJV-UHFFFAOYSA-N Butadiene Chemical compound C=CC=C KAKZBPTYRLMSJV-UHFFFAOYSA-N 0.000 description 2
- 239000004215 Carbon black (E152) Substances 0.000 description 2
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 2
- VQTUBCCKSQIDNK-UHFFFAOYSA-N Isobutene Chemical compound CC(C)=C VQTUBCCKSQIDNK-UHFFFAOYSA-N 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 150000002148 esters Chemical class 0.000 description 2
- 238000011010 flushing procedure Methods 0.000 description 2
- 229930195733 hydrocarbon Natural products 0.000 description 2
- 150000002430 hydrocarbons Chemical class 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 238000011144 upstream manufacturing Methods 0.000 description 2
- VXNZUUAINFGPBY-UHFFFAOYSA-N 1-Butene Chemical group CCC=C VXNZUUAINFGPBY-UHFFFAOYSA-N 0.000 description 1
- BKOOMYPCSUNDGP-UHFFFAOYSA-N 2-methylbut-2-ene Chemical group CC=C(C)C BKOOMYPCSUNDGP-UHFFFAOYSA-N 0.000 description 1
- -1 C 4 olefin Chemical class 0.000 description 1
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 150000001335 aliphatic alkanes Chemical class 0.000 description 1
- 239000006105 batch ingredient Substances 0.000 description 1
- 239000011324 bead Substances 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 150000001993 dienes Chemical class 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 230000032050 esterification Effects 0.000 description 1
- 238000005886 esterification reaction Methods 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000005194 fractionation Methods 0.000 description 1
- 235000003642 hunger Nutrition 0.000 description 1
- 238000005984 hydrogenation reaction Methods 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 150000002576 ketones Chemical class 0.000 description 1
- 229920002521 macromolecule Polymers 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 230000035484 reaction time Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000007363 ring formation reaction Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- GQKZRWSUJHVIPE-UHFFFAOYSA-N sec-amyl acetate Natural products CCCC(C)OC(C)=O GQKZRWSUJHVIPE-UHFFFAOYSA-N 0.000 description 1
- DCKVNWZUADLDEH-UHFFFAOYSA-N sec-butyl acetate Chemical compound CCC(C)OC(C)=O DCKVNWZUADLDEH-UHFFFAOYSA-N 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
Abstract
The utility model relates to a rectifying tower circulating system for removing light fraction coking in a reboiler through intermittent forced convection. The rectifying tower circulating system comprises a separating tower, a reboiler-to-separating-tower pipe, the reboiler, a separating-tower-to-reboiler pipe, a circulating pump, a control system and a separating tower kettle matter discharging port. The separating tower kettle matter discharging port is connected to the separating-tower-to-reboiler pipe, the control system comprises three turbine ball valves and a filter, two of the three turbine ball valves are connected with the other turbine ball valve in parallel, the filter is connected between the two turbine ball valves connected in parallel, a branch pipe is arranged on the separating-tower-to-reboiler pipe in a dividing mode to be connected with the circulating pump, and an outlet of the circulating pump is connected with the control system and then connected to the end, where the reboiler is located, of the separating-tower-to-reboiler pipe. According to the rectifying tower circulating system, the running period of the rectifying tower can be prolonged, the operation temperature of the rectifying tower can be reduced, the heat exchange efficiency of the reboiler can be improved, the heavy fraction discharging period can be shortened, and the running period of the reboiler can be prolonged.
Description
Technical field
The utility model relates to a kind of intermittent forced convertion and solves the rectifying column circulatory system of light fraction coking in reboiler.
Background technology
Coking all exists in all firing equipments, and just the difference due to temperature and medium makes coking degree have certain difference.
By-product C-4-fraction when hydrocarbon cracking ethene processed (main component is C 4 olefin and alkane) and acetic acid are the synthetic SBA(2-butyl acetate of raw material) reaction in, what utilize is n-butene, maleic, the anti-butylene of hydrocarbon fraction in C-4-fraction, isobutene in C-4-fraction is at MTBE(methyl tertiary butyl ether(MTBE)) device in reacted, in raw material, remnants are probably 0.03% left and right; In addition, in C-4-fraction, also contain mass fraction be about 0.1% butadiene cannot separated and utilization, through one-stage hydrogenation, process and its content can be down to 0.01% left and right, remaining activity is higher and what can produce light fraction is exactly that content is probably at 0.2% left and right iso-amylene.In raw material, unsaturated olefin enters after reactor, under the effect of catalyst, there is very high activity, wherein a part of alkene and acetic acid have carried out addition esterification generation product ester, and active high alkadienes carries out polymerization and cyclization generates the higher light fraction of boiling point.These light fractions that boiling point is relatively high under normal pressure (more than 150 ℃) cannot be separated in the elementary step of separation of products, is bound to enter acetic acid refining tower with acetic acid; And the operating temperature of the tower reactor of acetic acid refining tower (normal pressure) is 130 ℃ of left and right, under this operating condition, light fraction meeting is accumulated in acetic acid refining tower tower reactor.Acquire a certain degree and can cause the separating effect of tower to decline, in order to maintain the separating effect of the separated tower reactor of acetic acid, operating temperature needs continuous raising.Light fraction can be caused in this process in, as autohemagglutination and the polymerization of the component that contains insatiable hunger key, generate the heavy distillat that molten boiling point is higher; And be attached to light fraction on tube wall as ester, ketone, ether at high temperature interior molecules be combined to form high molecular heavy distillat.These macromolecules can constantly be accumulated and be attached on pipeline and heat exchanger tube in tower reactor, when the lower and pipe flow speed of tower reactor liquid level is slower, will dewater and form burnt shape thing, cause the fluctuation of service of knockout tower and the heat transfer effect of heat exchanger to reduce, increase energy consumption, when serious, need that whole rectifying knockout tower is stopped to tower and clean tower reactor and heat exchanger tube.In industrial processes, the autohemagglutination of light fraction and polymerization are inevitable, on the one hand can be by requiring upstream enterprise strictly to control the generation that component in raw material C-4-fraction reduces light fraction, the opposing party can only the intermittent separating stable that heavy distillat extraction at the bottom of tower reactor is maintained to tower.In whole SBA process units, all heavy distillat nearly all comes from autohemagglutination and the polymerization of light fraction in acetic acid refining process, these heavy distillat are on installing the stable important impact that has, upstream enterprise is that unsettled and intermittent discharge heavy distillat enhances the workload that has added operating personnel on the one hand to the control of component, does not fundamentally solve on the other hand the problem that heat exchanger thermal conductivity factor that heat exchanger tube coking causes declines.Therefore how alleviating light fraction autohemagglutination and polymerization is an important step that improves the heat exchanger production cycle.
Chinese patent ZL200620170299.6 discloses the forced circulation system that reduces reboiler polymerization in a kind of C5 separation.In this patent, proposed to add a circulating pump at the bottom of tower reactor, with pump by the mass transport of tower reactor in reboiler, force the material of tower reactor and the forced circulation of reboiler, the tower reactor making is similar with reboiler material composition, the reaction time of unsaturated olefin autohemagglutination and polymerization in minimizing material.
This technology is for reducing the forced circulation system of reboiler polymerization in C5 separation.This system has added circulating pump in system as a common equipment, in order to maintain the stable operation of tower, must be provided with a stand-by pump and have flow-control at delivery side of pump, prevents that the liquid level of tower reactor is evacuated, and affects the stable operation of tower; This type selecting to the material of pipeline and pump of words that reboiler outlet temperature reaches the operation steady in a long-term of 120 ℃ of needs has higher requirement; Under the running of pump, the pressure decreased of tower reactor, can be long-term lower this separative efficiency on tower of tower reactor pressure has important impact.In SBA device, very fast due to light fraction autohemagglutination and polymerization in the reboiler of the reason knockout tower of temperature and content, but coking process is slow.Therefore the forced circulation of continuation there is no need completely.
Utility model content
Problem to be solved in the utility model is the service cycle that increases rectifying column, lowers the operating temperature of rectifying column, improves the heat exchange efficiency of reboiler, reduces the discharge cycle of heavy distillat, extends the cycle of operation of reboiler.
The utility model object is to provide a kind of intermittent forced convertion and solves the rectifying column circulatory system of light fraction coking in reboiler, it comprises: knockout tower, reboiler removes knockout tower pipeline, reboiler, knockout tower removes reboiler pipeline, circulating pump, control system and knockout tower tower reactor material extraction mouth, wherein, knockout tower tower reactor material extraction mouth is connected in knockout tower and goes on reboiler pipeline, control system comprises three turbine ball valves and a filter, two in three turbine ball valves (, first and second) with another (, the 3rd) be connected in parallel, (filter is connected to two turbine ball valves in parallel, first and second) between, at knockout tower, going to separate an arm on reboiler pipeline is connected with circulating pump, circulation delivery side of pump is connected with control system, and then be connected to the reboiler end that knockout tower removes reboiler pipeline.
According to device of the present utility model, at knockout tower, removing the arm being connected with circulating pump separating on reboiler pipeline is after knockout tower tower reactor material extraction mouth.
In the utility model, in the tower reactor of rectifying column, go the upper forced convertion system that increases of pipeline (after tower reactor re-scheduling cut valve) of reboiler, comprise pipeline, turbine ball valve, circulating pump.By this forced convertion system, can carry out intermittent startup circulating pump by the control of turbine ball valve.For example, be in operation, with the temperature at the bottom of knockout tower tower, be designated as foundation, due to the accumulation of light fraction, the operating temperature at the bottom of knockout tower tower can rising.According to tower sill strip part, determine, general operation temperature is 128～129 ℃, just can start circulating pump and carry out forced convertion when temperature increases to 133～134 ℃.When starting circulating pump, can first allow material walk circulating-pump outlet not with the pipeline of filter, operation is after 6 hours at most, minimum every 4～5 hours of this stage just must be cleared up filter, also can be extended by the situation of pump and filter the utility time of filter.Because the material after light fraction coking can only circulate between pipeline or precipitation under tower reactor and reboiler, by intermittent circulating pump and the intermittent switchable pump outlet conduit of opening, can to greatest extent the coking material in pipeline and reboiler tube bank be run up in filter, therefore we only need to just reach by filter rinsed the object of pure and fresh reboiler and knockout tower tower reactor, this has increased the cycle of operation of knockout tower greatly, increase convection current, flushing pipe and the heat exchanger tube of tower reactor and reboiler class material.
The utility model is controlled forced convertion by control system 6, and this part has the various situations that three turbine ball valves and filter can be processed knockout tower, maintains to the full extent the stable of knockout tower.Selecting of turbine ball valve, considers that tower reactor and reboiler batch ingredients are complicated, and density and viscosity conversion are large, and washes away polymer beads that pipeline produces while starting circulating pump and easily at valve place, assemble and cause valve opening difficulty.Turbine ball valve has the following advantages: 1, fluid resistance is little, and its resistance coefficient equates with the pipeline section of same length.2, simple in structure, volume is little, lightweight, closely reliable.3, easy to operate, open and close rapidly, from standard-sized sheet to complete shut-down, need only half-twist, it is convenient to control.4, easy to maintenance, ball-valve structure is simple, and sealing ring is all generally movable, and dismounting and change is all more convenient.5,, when standard-sized sheet or full cut-off, the sealing surface of spheroid and valve seat and medium isolation, when medium passes through, can not cause the erosion of valve sealing face.
In addition, in different operating modes, if if in knockout tower tower reactor in material heavy distillat so easily do not remove, in the downstream of circulating pump, increase an evaporating kettle or settling tank, as the pretreatment of component.
Advantage of the present utility model:
1. by increasing control system 6, this facility can intermittently be moved, make it can solve operation knockout tower simultaneously and say light fraction coking problem in the reboiler running into, increase the service cycle of reboiler and the stability of knockout tower.
2. in the ordinary course of things, take reboiler inlet temperature in indication judgement tower reactor heavy distillat number.Start pump operating cycle and by original condensate drain valve, heavy distillat be discharged in the system of the way of escape and recycle after a period of time, if heavy distillat viscosity is large, can its circulating pump control by ball valve come discharged to way of escape system.The setting of filter also guarantees the burnt body particle under washing away in reboiler tube bank to tackle, and does not reenter in reboiler and is again attached in tube bank.
Accompanying drawing explanation
Fig. 1 is the schematic diagram that intermittent forced convertion solves the rectifying column circulatory system of light fraction coking in reboiler, wherein: 1 is knockout tower, 2 remove knockout tower pipeline for reboiler, 3 is reboiler, 4 for knockout tower removes reboiler pipeline, and 5 is circulating pump, and 6 is control system, 7 is knockout tower tower reactor material extraction mouth, and control system 6 comprises three turbine ball valves 8 and a filter 9.
The specific embodiment
The utility model provides a kind of intermittent forced convertion to solve the rectifying column circulatory system of light fraction coking in reboiler, it comprises knockout tower 1, reboiler removes knockout tower pipeline 2, reboiler 3, knockout tower removes reboiler pipeline 4, circulating pump 5, control system 6, knockout tower tower reactor material extraction mouth 7, control system 6 comprises three turbine ball valves 8 and a filter 9.
The object that this circulatory system is set is to slow down the coking of light fraction in knockout tower, and by the pipeline between intermittent forced circulation flushing reboiler and knockout tower and the tube side of reboiler.Control by pipeline and valve has formed the circulatory system that can enable at any time, circulating pump general one just passable.
Embodiment
Pipeline to the entrance of the reboiler 3 of knockout tower 1 is transformed, and having increased a flow is 59m
3/ h, the control system 6 that comprises three turbine ball valves 8 and filter 9 of the circulating pump 5 that lift is 10m and circulating-pump outlet.Make knockout tower 1 tower reactor material enter reboiler 3 after circulating pump 5 and turbine ball valve 8.Be in operation, when knockout tower goes the pipe temperature indication of reboiler pipeline 4 higher, close knockout tower and remove reboiler pipeline 4 place's valves, start circulating pump 5, allow 1 place's material enter in reboiler 3 by control system 6.In early stage of forced convertion, by the valve closing of the first and second positions, 8 place, open the 3rd valve.Circulating pump 5 after 6 hours a period of times of operation by first and second valve opens at three turbine ball valve 8 places, close the 3rd valve, allow material from filter 9 processes, state with material process filter 9 moves 18 hours, wherein need every 4～5 hours needs filter rinsed, in the time of filter rinsed, just material can be switched to the pipeline without filter, general about 24 hours of the time of whole startup circulating pump is just passable, and the 4 place's temperature of take decline 4～5 ℃ as determining the time of termination of pumping.By control system 6, can intermittently the material of coking in tower reactor and reboiler be gone out to rectification method system by 9 cleaning filters.The process conditions that maintain knockout tower 1 are constant, 4～5 ℃ of reboiler inlet temperature declines detected and maintain the required steam decline 80～100kg/h of knockout tower liquid level reboiler, and energy-saving effect is obvious.The system that does not add control system of the present invention and circulating pump with same condition operation.The results are shown in Table 1～2.
Table 1 reboiler has been changed tube bank but has not been added circulating pump and control system
Tower is cleaned in table 2 shut-down and heat exchanger tube adds circulating pump
From table 1 and the contrast of table 2, can see, according to system of the present utility model, the practical cycle of reboiler has obviously increased, and maintains the minimizing that the required steam flow of tower reactor liquid level also has certain degree, and energy conservation and consumption reduction effects is obvious.
Below understand specifically system of the present utility model, yet, being understandable that, those of ordinary skills can make various modification on disclosed basis of the present utility model.Various modification within not departing from purport of the present utility model are also included in protection domain of the present utility model.
Claims (3)
1. an intermittent forced convertion solves the rectifying column circulatory system of light fraction coking in reboiler, it is characterized in that comprising: knockout tower, reboiler removes knockout tower pipeline, reboiler, knockout tower removes reboiler pipeline, circulating pump, control system and knockout tower tower reactor material extraction mouth, wherein, knockout tower tower reactor material extraction mouth is connected in knockout tower and goes on reboiler pipeline, control system comprises three turbine ball valves and a filter, two in three turbine ball valves are connected in parallel with another, filter is connected between two turbine ball valves in parallel, at knockout tower, going to separate an arm on reboiler pipeline is connected with circulating pump, circulation delivery side of pump is connected with control system, and then be connected to the reboiler end that knockout tower removes reboiler pipeline.
2. the rectifying column circulatory system according to claim 1, is characterized in that: at knockout tower, removing the arm being connected with circulating pump separating on reboiler pipeline is after knockout tower tower reactor material extraction mouth.
3. the rectifying column circulatory system according to claim 1 and 2, is characterized in that: at Increasing exports pretreated evaporating kettle or settling tank as component for circulating pump.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320620654.5U CN203469519U (en) | 2013-10-09 | 2013-10-09 | Rectifying tower circulating system for removing light fraction coking in reboiler through intermittent forced convection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320620654.5U CN203469519U (en) | 2013-10-09 | 2013-10-09 | Rectifying tower circulating system for removing light fraction coking in reboiler through intermittent forced convection |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203469519U true CN203469519U (en) | 2014-03-12 |
Family
ID=50217938
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320620654.5U Expired - Lifetime CN203469519U (en) | 2013-10-09 | 2013-10-09 | Rectifying tower circulating system for removing light fraction coking in reboiler through intermittent forced convection |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203469519U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108261795A (en) * | 2018-01-13 | 2018-07-10 | 安徽金禾实业股份有限公司 | The circular heating method and its device of reboiler in pyrrolidones production |
-
2013
- 2013-10-09 CN CN201320620654.5U patent/CN203469519U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108261795A (en) * | 2018-01-13 | 2018-07-10 | 安徽金禾实业股份有限公司 | The circular heating method and its device of reboiler in pyrrolidones production |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| C53 | Correction of patent of invention or patent application | ||
| CB03 | Change of inventor or designer information |
Inventor after: Gan Jian Inventor after: Li Yuanyuan Inventor after: Zhang Jie Inventor after: Liu Cheng Inventor before: Gan Jian Inventor before: Li Yuanyuan Inventor before: Zhang Jie Inventor before: Liu Cheng |
|
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20140312 |