CN109851475A - A kind of online paraffin removal method of methanol-fueled CLC - Google Patents
A kind of online paraffin removal method of methanol-fueled CLC Download PDFInfo
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- CN109851475A CN109851475A CN201811641394.3A CN201811641394A CN109851475A CN 109851475 A CN109851475 A CN 109851475A CN 201811641394 A CN201811641394 A CN 201811641394A CN 109851475 A CN109851475 A CN 109851475A
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- methanol
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- paraffin removal
- methyl alcohol
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Abstract
The present invention discloses a kind of online paraffin removal method of methanol-fueled CLC, first system for methanol synthesis is stopped, methyl alcohol synthetic reactor and drum keep liquid level, simultaneously after the logical low-pressure nitrogen of synthesis compression entrance is qualified by effective gas displacement in system, stops synthesic gas compressor, close and import and export stop valve, keep system for methanol synthesis pressure, methanol separator is vented methanol, dismantles methanol separator outlet and is shorted, connects temporary valve and pipeline de-waxing；Medium pressure nitrogen gas blind plate is connected in system for methanol synthesis again, slowly opens medium pressure nitrogen air valve, while keeping system for methanol synthesis pressure；It is vented the water of desalination water preheater, methanol water cooler；The blind plate of steam, slowly opens and is passed through steam into system, make desalination water preheater to methanol separator pipeline temperature rise before conducting desalination water preheater；Temporary pipeline valve de-waxing is opened again, judges whether system for methanol synthesis paraffin removal terminates by discharge rate；The online paraffin removal method of the present invention has the characteristics that the system shutdown time is short, at low cost, paraffin removal is thorough.
Description
Technical field
The present invention relates to methanol synthesis technology field more particularly to a kind of online paraffin removal methods of methanol-fueled CLC.
Background technique
The impurity contents such as iron, nickel, sodium are excessive in methanol synthesis catalyst or catalyst using later period CO too high levels and
The too high or too low side reaction that can promote to synthesize wax deposition of nominal situation lower operating temps, the paraffin main component for reacting generation are
Some Long carbon chain higher alkane classes, i.e. aliphatic hydrocarbon, molecular formula CnH2n+2, such fat hydrocarbon are lower than 85 DEG C in temperature
Solid-state and viscous liquid can be condensed into synthesis desalination water cooler, synthetic water heat-exchange tube of cooler inner wall when following, seriously
The normal heat exchange for influencing heat exchanger, will lead to methanol content substantial increase in circulating air, and it is anti-to be not only degrading methanol-fueled CLC
It answers, while will cause compressor seriously band liquid accident, so paraffin removal operation must be carried out in time when synthesis system wax deposition is serious.
There are mainly two types of the methods of industrial system for methanol synthesis paraffin removal, and one is the heating after parking to blow down method, another
Kind is online Hot-strip Method.Compare two kinds of paraffin removal methods, the more serious operating condition of heating blowing method suitable system wax deposition, its advantage is that removing
Wax more thoroughly, except the paraffin gone out can clear out of system in time, will not impact, the disadvantage is that when parking paraffin removal to the operation of rear system
Between it is longer uneconomical；Hot-strip Method paraffin removal is mainly suitable for the slighter operating condition of system wax deposition, its advantage is that system does not need to be stopped
Vehicle, the paraffin removal time is short, the disadvantage is that paraffin removal is not thorough, compressor out temperature can be increased significantly, circulating air after temperature increases
Middle methanol content substantial increase is degrading methanol synthesis reaction, and side reaction increases, while compressor has the risk with liquid, except out
Paraffin cannot be cleared out of in time system, into alcohol point after will cause liquid level valve blocking, it is full that cleaning will cause alcohol point not in time
Liquid, a large amount of paraffin enter after rectifying and can also assemble in low-temperature space, influence whether rectifying normal operation and refined methanol product quality, meeting
Block wastewater of rectification cooler and waste water pump screen.Therefore, this kind of be particularly important is solved the problems, such as.
Summary of the invention
In view of the deficiencies of the prior art, the present invention provides a kind of online paraffin removal methods of methanol-fueled CLC, have system shutdown
Time short, at low cost, paraffin removal is thorough feature.
In order to realize above-mentioned technical proposal, the present invention provides a kind of online paraffin removal method of methanol-fueled CLC, methanol-fueled CLC systems
The equipment that system uses includes compressor, heat exchanger, methyl alcohol synthetic reactor, drum, desalination water preheater, methanol water cooler, methanol
Separator and flash tank, the synthesis gas come from compressor is after heat exchanger is warming up to certain temperature, into methyl alcohol synthetic reactor, in first
In alcohol synthetic tower, gas flows through reaction tube from top to bottom, under the action of catalyst, CO, CO2 is reacted with H2 respectively and generate first
Alcohol, reaction heat are transmitted to the boiled water of shell side, and by drum by-product middle pressure steam, the synthesis gas after methyl alcohol synthetic reactor is in heat exchanger out
It is reduced with temperature after methyl alcohol synthetic reactor gas exchanges heat is entered, then successively after desalination water preheater, methanol water cooler are cooled to 40 DEG C,
Through methanol separator gas-liquid separation, liquid phase crude carbinol removes the further gas-liquid separation of flash tank, the online paraffin removal method packet of methanol-fueled CLC
Include following steps:
Step 1: system for methanol synthesis is stopped, and methyl alcohol synthetic reactor opens injector and temperature is maintained 180 DEG C -260 DEG C, methanol
Synthetic tower and drum keep liquid level, while in synthesis compression entrance logical low-pressure nitrogen that effective gas displacement in system is qualified
Afterwards, stop synthesic gas compressor, close inlet and outlet stop valve, and system for methanol synthesis pressure is kept into 30-50kPa pressure, together
When methanol separator be vented methanol, dismantle methanol separator outlet be shorted, connect temporary valve and pipeline de-waxing；
Step 2: medium pressure nitrogen gas blind plate is connected in system for methanol synthesis, slowly opens medium pressure nitrogen air valve, while keeping methanol-fueled CLC
System pressure；
Step 3: the water of emptying desalination water preheater, methanol water cooler；
Step 4: the blind plate of 2.5MPa steam before conducting desalination water preheater is slowly opened and is passed through steam into system, so that de-
Brine preheater is to methanol separator pipeline temperature rise；
Step 5: opening temporary pipeline valve de-waxing, judge whether system for methanol synthesis paraffin removal terminates by discharge rate, after
Stop steam and close nitrogen valve, blind plate is resetted.
Further improvement lies in that: in step 1, leads to low-pressure nitrogen and effective gas in system is replaced to qualified, criterion of acceptability
It is effective gas in system less than 0.5% (percent by volume).
Further improvement lies in that: in step 2, the pressure that system for methanol synthesis is kept is in 30-50KPa.
Further improvement lies in that: in step 4, desalination water preheater to methanol separator pipeline temperature rise is to 80 DEG C -120
℃。
Further improvement lies in that: the methyl alcohol synthetic reactor includes the first methyl alcohol synthetic reactor and the second methyl alcohol synthetic reactor, institute
It states the first methyl alcohol synthetic reactor and the second methyl alcohol synthetic reactor is interconnected.
The beneficial effects of the present invention are: paraffin removal of the present invention is more thoroughly, except the paraffin gone out can clear out of system in time, by connecing
Temporary valve and pipeline carry out de-waxing, can thorough paraffin removal, and the paraffin removal time is short, will not impact to the operation of rear system,
Present system down time is short simultaneously, will not deteriorate methanol synthesis reaction.
Detailed description of the invention
Fig. 1 is the process flow chart of system for methanol synthesis of the invention.
Wherein: 1- compressor, 2- heat exchanger, 3- methyl alcohol synthetic reactor, 4- drum, 5- desalination water preheater, 6- methanol water cooling
Device, 7- methanol separator, 8- flash tank.
Specific embodiment
In order to deepen the understanding of the present invention, the present invention is further described below in conjunction with embodiment, the present embodiment
For explaining only the invention, it is not intended to limit the scope of the present invention..
According to Fig. 1, a kind of online paraffin removal method of methanol-fueled CLC is present embodiments provided, what system for methanol synthesis used
Equipment includes compressor 1, heat exchanger 2, methyl alcohol synthetic reactor 3, drum 4, desalination water preheater 5, methanol water cooler 6, methanol point
From device 7 and flash tank 8, from the synthesis gas of compressor 1 after heat exchanger 2 is warming up to certain temperature, into methyl alcohol synthetic reactor 3；
In methyl alcohol synthetic reactor 3, gas flows through reaction tube from top to bottom, under the action of catalyst, CO, CO2 is reacted with H2 respectively and given birth to
At methanol, reaction heat is transmitted to the boiled water of shell side, and by 4 by-product middle pressure steam of drum, the synthesis gas after methyl alcohol synthetic reactor 3 is being changed out
Temperature reduces in hot device 2 and after entering the heat exchange of methyl alcohol synthetic reactor gas, then successively cooling through desalination water preheater 5, methanol water cooler 6
To after 40 DEG C, through 7 gas-liquid separation of methanol separator, liquid phase crude carbinol goes the further gas-liquid separation of flash tank 8, and methanol-fueled CLC is online
Paraffin removal method the following steps are included:
Step 1: system for methanol synthesis is stopped, and methyl alcohol synthetic reactor opens injector and temperature is maintained 220 DEG C, methyl alcohol synthetic reactor
Liquid level is kept with drum, while after the logical low-pressure nitrogen of synthesis compression entrance is qualified by effective gas displacement in system, being stopped
Synthesic gas compressor closes inlet and outlet stop valve, and system for methanol synthesis pressure is kept 30-50kPa pressure, while methanol point
It is vented methanol from device, methanol separator outlet is dismantled and is shorted, connect temporary valve and pipeline de-waxing；
Step 2: medium pressure nitrogen gas blind plate is connected in system for methanol synthesis, slowly opens medium pressure nitrogen air valve, while keeping methanol-fueled CLC
System pressure；
Step 3: the water of emptying desalination water preheater, methanol water cooler；
Step 4: the blind plate of 2.5MPa steam before conducting desalination water preheater is slowly opened and is passed through steam into system, so that de-
Brine preheater is to methanol separator pipeline temperature rise；
Step 5: opening temporary pipeline valve de-waxing, judge whether system for methanol synthesis paraffin removal terminates by discharge rate, after
Stop steam and close nitrogen valve, blind plate is resetted.
In step 1, leads to low-pressure nitrogen for effective gas in system and replace qualification, criterion of acceptability is effective in system
Gas is less than 0.5% (percent by volume).In step 2, the pressure that system for methanol synthesis is kept is in 30-50KPa.In step 4
In, desalination water preheater to methanol separator pipeline temperature rise is to 100 DEG C.The methyl alcohol synthetic reactor 3 includes the first methanol-fueled CLC
Tower and the second methyl alcohol synthetic reactor, first methyl alcohol synthetic reactor and the second methyl alcohol synthetic reactor are interconnected.
Paraffin removal of the present invention more thoroughly, except go out paraffin can clear out of system in time, by connect temporary valve and pipeline come into
Row de-waxing, can thorough paraffin removal, and the paraffin removal time is short, will not impact to the operation of rear system, while present system stops
Time is short, will not deteriorate methanol synthesis reaction.
Claims (5)
1. a kind of online paraffin removal method of methanol-fueled CLC, the equipment that system for methanol synthesis uses includes compressor (1), heat exchanger
(2), methyl alcohol synthetic reactor (3), drum (4), desalination water preheater (5), methanol water cooler (6), methanol separator (7) and flash tank
(8), the synthesis gas come from compressor (1) is after heat exchanger (2) is warming up to certain temperature, into methyl alcohol synthetic reactor (3)；In methanol
In synthetic tower (3), gas flows through reaction tube from top to bottom, under the action of catalyst, CO, CO2 is reacted with H2 respectively and generate first
Alcohol, reaction heat are transmitted to the boiled water of shell side, and by drum (4) by-product middle pressure steam, the synthesis gas after methyl alcohol synthetic reactor (3) is being changed out
Temperature reduces in hot device (2) and after entering the heat exchange of methyl alcohol synthetic reactor gas, then successively through desalination water preheater (5), methanol water cooler
(6) after being cooled to 40 DEG C, through methanol separator (7) gas-liquid separation, liquid phase crude carbinol goes flash tank (8) further gas-liquid separation,
It is characterized in that, the online paraffin removal method of methanol-fueled CLC the following steps are included:
Step 1: system for methanol synthesis is stopped, and methyl alcohol synthetic reactor opens injector and temperature is maintained 180 DEG C -260 DEG C, methanol
Synthetic tower and drum keep liquid level, while in synthesis compression entrance logical low-pressure nitrogen that effective gas displacement in system is qualified
Afterwards, stop synthesic gas compressor, close inlet and outlet stop valve, and system for methanol synthesis pressure is kept into 30-50kPa pressure, together
When methanol separator be vented methanol, dismantle methanol separator outlet be shorted, connect temporary valve and pipeline de-waxing；
Step 2: medium pressure nitrogen gas blind plate is connected in system for methanol synthesis, slowly opens medium pressure nitrogen air valve, while keeping methanol-fueled CLC
System pressure；
Step 3: the water of emptying desalination water preheater, methanol water cooler；
Step 4: the blind plate of 2.5MPa steam before conducting desalination water preheater is slowly opened and is passed through steam into system, so that de-
Brine preheater is to methanol separator pipeline temperature rise；
Step 5: opening temporary pipeline valve de-waxing, judge whether system for methanol synthesis paraffin removal terminates by discharge rate, after
Stop steam and close nitrogen valve, blind plate is resetted.
2. a kind of online paraffin removal method of methanol-fueled CLC according to claim 1, it is characterised in that: in step 1, lead to low
Nitrogen is pressed to replace effective gas in system qualified, criterion of acceptability is effective gas in system less than 0.5% (percent by volume).
3. a kind of online paraffin removal method of methanol-fueled CLC according to claim 1, it is characterised in that: in step 2, methanol
The pressure that synthesis system is kept is in 30-50KPa.
4. a kind of online paraffin removal method of methanol-fueled CLC according to claim 1, it is characterised in that: in step 4, desalination
Water preheater is to methanol separator pipeline temperature rise to 80 DEG C -120 DEG C.
5. a kind of online paraffin removal method of methanol-fueled CLC according to claim 1, it is characterised in that: the methyl alcohol synthetic reactor
It (3) include the first methyl alcohol synthetic reactor and the second methyl alcohol synthetic reactor, first methyl alcohol synthetic reactor and the second methyl alcohol synthetic reactor phase
It is intercommunicated.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811641394.3A CN109851475A (en) | 2018-12-29 | 2018-12-29 | A kind of online paraffin removal method of methanol-fueled CLC |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811641394.3A CN109851475A (en) | 2018-12-29 | 2018-12-29 | A kind of online paraffin removal method of methanol-fueled CLC |
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| CN109851475A true CN109851475A (en) | 2019-06-07 |
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| CN201811641394.3A Pending CN109851475A (en) | 2018-12-29 | 2018-12-29 | A kind of online paraffin removal method of methanol-fueled CLC |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112443757A (en) * | 2020-10-28 | 2021-03-05 | 中石化宁波工程有限公司 | System and method for preventing high-pressure channeling and low-pressure channeling of methanol device |
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| CN202403609U (en) * | 2011-12-28 | 2012-08-29 | 惠生（南京）清洁能源股份有限公司 | Device for paraffin deposition treatment of water cooler in methanol synthesis |
| CN203360334U (en) * | 2013-06-13 | 2013-12-25 | 陕西渭河煤化工集团有限责任公司 | Wax removing device of methanol production system |
| CN103980939A (en) * | 2014-05-13 | 2014-08-13 | 山西兰花科技创业股份有限公司 | Method of rapidly eliminating "wax precipitation" in alcoholization and alkylation systems |
| CN104402674A (en) * | 2014-12-09 | 2015-03-11 | 呼伦贝尔东能化工有限公司 | Online wax removing method for methanol synthesis system |
| CN206881687U (en) * | 2017-06-29 | 2018-01-16 | 新能能源有限公司 | A kind of methanol separator steam boiled in wax device |
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2018
- 2018-12-29 CN CN201811641394.3A patent/CN109851475A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202403609U (en) * | 2011-12-28 | 2012-08-29 | 惠生（南京）清洁能源股份有限公司 | Device for paraffin deposition treatment of water cooler in methanol synthesis |
| CN203360334U (en) * | 2013-06-13 | 2013-12-25 | 陕西渭河煤化工集团有限责任公司 | Wax removing device of methanol production system |
| CN103980939A (en) * | 2014-05-13 | 2014-08-13 | 山西兰花科技创业股份有限公司 | Method of rapidly eliminating "wax precipitation" in alcoholization and alkylation systems |
| CN104402674A (en) * | 2014-12-09 | 2015-03-11 | 呼伦贝尔东能化工有限公司 | Online wax removing method for methanol synthesis system |
| CN206881687U (en) * | 2017-06-29 | 2018-01-16 | 新能能源有限公司 | A kind of methanol separator steam boiled in wax device |
Non-Patent Citations (1)
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Cited By (1)
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| CN112443757A (en) * | 2020-10-28 | 2021-03-05 | 中石化宁波工程有限公司 | System and method for preventing high-pressure channeling and low-pressure channeling of methanol device |
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Effective date of registration: 20200103 Address after: 212006 No. 88 Qiusuo Road, Jingkou District, Zhenjiang City, Jiangsu Province Applicant after: JIANGSU SOPO CHEMICAL Co.,Ltd. Applicant after: JIANGSU SOPO ENGINEERING TECHNOLOGY CO.,LTD. Address before: No. 101, Jingkou Road, Zhenjiang, Jiangsu, Jiangsu Applicant before: JIANGSU SOPO (Group) Co.,Ltd. Applicant before: JIANGSU SOPO ENGINEERING TECHNOLOGY CO.,LTD. |
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Application publication date: 20190607 |