CN105779026B - Methanol washes system - Google Patents
Methanol washes system Download PDFInfo
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- CN105779026B CN105779026B CN201610141286.4A CN201610141286A CN105779026B CN 105779026 B CN105779026 B CN 105779026B CN 201610141286 A CN201610141286 A CN 201610141286A CN 105779026 B CN105779026 B CN 105779026B
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- heat exchanger
- methanol
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- filter
- gas
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10K—PURIFYING OR MODIFYING THE CHEMICAL COMPOSITION OF COMBUSTIBLE GASES CONTAINING CARBON MONOXIDE
- C10K1/00—Purifying combustible gases containing carbon monoxide
- C10K1/08—Purifying combustible gases containing carbon monoxide by washing with liquids; Reviving the used wash liquors
- C10K1/16—Purifying combustible gases containing carbon monoxide by washing with liquids; Reviving the used wash liquors with non-aqueous liquids
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Combustion & Propulsion (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Organic Chemistry (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
The present invention provides a kind of methanol to wash system, including filter and heat exchanger, the feed inlet of filter is passed through pipeline with methanol and connect, the import of the discharge port and heat exchanger of filter connects, methanol washes system further include: gas blasts pipeline, gas blasts the upstream that the import of heat exchanger is arranged in pipeline, the impurity on inner wall for blasting gas into heat exchanger to remove heat exchanger.Methanol in the application is washed system structure and is simple and convenient to operate, and can more easily be cleaned online heat exchanging device, and the operating cost of device where the methanol washes system is reduced, and reduces the repair and maintenance expense of heat exchanger.
Description
Technical field
The present invention relates to purified synthesis gas fields, wash system in particular to a kind of methanol.
Background technique
Generally, low-temp methanol wash the methanol loop system in purified synthesis gas device heat exchanger usage amount it is larger, in work
When skill designs, in order to reduce heat exchanger volume, plant construction occupied area is reduced, while improving system heat exchanger heat transfer effect,
The heat exchanger of reduction system loss of refrigeration capacity, methanol loop components of system as directed is designed using wound tube heat exchanger.
Since coiled heat exchanger has perishable, easy fouling, susceptible to plugging own structural characteristics, low-temp methanol washing process
In technological design, the fouling of heat exchangers of methanol loop system even stopping state occurs when to reduce system operation, is recycling
The rich or poor methanol region of methanol system is respectively provided with the different methanol filtration facility of filtering accuracy.
However, washing in actual moving process in low-temp methanol, heat exchanger usually can still occur to some extent in the system
Fouling even stopping state.In the rectisol system using single-filter, overhaul terminates to establish methanol for the first time to follow this point
After ring, performance it is particularly evident.At this point, since the fluid flow rate in the shell side of heat exchanger is usually slow, the corrosion of system internal cause
And a large amount of solid deposits (sulfide of iron) peeled off, it is gathered in the shell side of heat exchanger, heat exchanger heat transfer effect starts
It reduces, when reaching a certain level, heat exchanger fluid negotiability is restricted, and the operating load of device will be by compared with the day of one's doom
System.
Heat exchanger blocking the case where occur after, each Chemical Manufacture enterprise usually to blocking heat exchanger take physics cleaning,
The method that chemical cleaning or both combines carries out, though the above method can also play centainly the improvement of blocking heat exchanger negotiability
Good effect, but since the above method is required to carry out after system shut-down, to influence device production task
It completes.In chemical cleaning, cleaning process parameter adjusts not the probability that chemical attack occurs in heat exchanger at that time and leads to interior leakage
It will greatly increase.This point is especially to the process units for taking woods moral low-temp methanol washing process, since its wound tube heat exchanger is
Vertical structure, to improve heat exchange efficiency, heat exchanger tube generallys use thin-wall tube design, and chemical cleaning is taken to generate the interior risk meeting leaked
It further increases.
Summary of the invention
The main purpose of the present invention is to provide a kind of methanol to wash system, washes system not to solve methanol in the prior art
Problem easy to clean.
The present invention provides a kind of methanol to wash system, including filter and heat exchanger, and the feed inlet and methanol of filter are logical
Enter pipeline connection, the import of the discharge port and heat exchanger of filter connects, and methanol washes system further include: gas blasts pipeline, gas
Body blasts the upstream that the import of heat exchanger is arranged in pipeline, and the inner wall of heat exchanger is removed for blasting gas into heat exchanger
Impurity.
Further, gas blasts pipeline connection on the filter.
Further, the lower end of filter is arranged in the feed inlet of filter, and the discharge port of filter is arranged in filter
Upper end, and gas blasts the top that pipeline is connected to filter.
Further, it is nitrogen access that gas, which blasts pipeline,.
Further, gas, which blasts, is equipped with the first on-off control valve on pipeline.
Further, gas, which blasts, is equipped with first flow regulating valve on pipeline.
Further, heat exchanger includes shell and cold recovery pipeline, and cold recovery pipeline runs through shell, and heat exchanger
Import and the outlet of heat exchanger are separately positioned on shell, and the import of heat exchanger and the outlet of heat exchanger are separately positioned on cooling capacity
The corresponding side of recovery line.
Further, the extending direction of cold recovery pipeline and the extending direction of shell are identical, and along the extension side of shell
The outlet of import and heat exchanger to heat exchanger is separately positioned on the both ends of shell.
Further, the methanol system of washing further includes stripping tower, and the outlet of heat exchanger and the import of stripping tower connect.
Further, the methanol system of washing further includes filter bypass line, and one end of filter bypass line was connected to
On pipeline between filter and heat exchanger, the other end of filter bypass line is connected to methanol and is passed through on pipeline.
The methanol system of washing in the present invention includes that gas blasts pipeline, and heat exchanger is arranged in since the gas blasts pipeline
Upstream, in this way, can blast the gas that pipeline blasts when methanol enters in heat exchanger along with gas and enter heat exchanger together
Interior, due in gas and liquid together inflow heat exchanger, forming two-phase stream mode, and two phase flow can occur due to the difference of pressure
Slight blasting phenomena, and then the impurity on heat exchanger inner wall is made to fall off from the interior wall of heat exchanger, to reach cleaning heat exchange
The purpose of device.
Methanol in the application is washed system structure and is simple and convenient to operate, and can more easily online heat exchanging device carry out
Cleaning, reduces the operating cost of device where the methanol washes system, and reduces the repair and maintenance expense of heat exchanger.
Detailed description of the invention
The accompanying drawings constituting a part of this application is used to provide further understanding of the present invention, and of the invention shows
Examples and descriptions thereof are used to explain the present invention for meaning property, does not constitute improper limitations of the present invention.In the accompanying drawings:
Fig. 1 shows the structural schematic diagram that the methanol in the present invention washes system.
Wherein, the above drawings include the following reference numerals:
10, filter；20, heat exchanger；21, shell；22, cold recovery pipeline；30, methanol is passed through pipeline；40, gas drum
Enter pipeline；41, the first on-off control valve；42, first flow regulating valve；43, first pressure gauge；50, filter bypass line；
61, second flow regulating valve；62, third flow control valve；63, second pressure gauge；64, the 4th pressure gauge；65, filter bypass
Flow control valve.
Specific embodiment
It should be noted that in the absence of conflict, the features in the embodiments and the embodiments of the present application can phase
Mutually combination.The present invention will be described in detail below with reference to the accompanying drawings and embodiments.
The present invention provides a kind of methanol to wash system, referring to FIG. 1, the methanol system of washing includes filter 10 and heat exchanger
20, the feed inlet of filter 10 is passed through pipeline 30 with methanol and connect, and the discharge port of filter 10 is connect with the import of heat exchanger 20,
Methanol cleaning device further include: gas blasts pipeline 40, and gas blasts the upstream that the import of heat exchanger 20 is arranged in pipeline 40, uses
In blasting gas into heat exchanger 20 to remove the impurity on the inner wall of heat exchanger 20.
The methanol system of washing in the present invention includes that gas blasts pipeline 40, is being exchanged heat since the gas blasts the setting of pipeline 40
The upstream of device 20, in this way, when methanol enters in heat exchanger 20, can be blasted along with gas gas that pipeline 40 blasts together into
Enter in heat exchanger 20, due in gas and liquid together inflow heat exchanger 20, forming two phase flow state, two phase flow is due to pressure
Slight blasting phenomena can occur for the difference of power, and then take off the impurity on 20 inner wall of heat exchanger from the interior wall of heat exchanger 20
It falls, to achieve the purpose that clean heat exchanger.
Methanol in the application is washed system structure and is simple and convenient to operate, can more easily online heat exchanging device 20 into
Row cleaning, reduces the operating cost of device where the methanol washes system, and reduces the repair and maintenance expense of heat exchanger.
Preferably, as shown in Figure 1, gas blasts pipeline 40 is connected on filter 10.In this way, gas blasts the drum of pipeline 40
The gas entered can enter in heat exchanger 20 together with the methanol filtered out through filter 10, and then realize the friendship of two phase flow
It converges.
Preferably, the lower end of filter 10 is arranged in the feed inlet of filter 10, and the discharge port of filter 10 is arranged in mistake
The upper end of filter 10, and gas blasts the top that pipeline 40 is connected to filter 10.It is provided with the formation conducive to two phase flow in this way,
Make the gas entered in heat exchanger 20 that explosion occur under the action of pressure difference, accelerates flow disturbance effect, thus by heat exchanger 20
Impurity generation on inner wall loosens.
Preferably, it is nitrogen access that gas, which blasts pipeline 40,.Nitrogen is inert gas, is passed through nitrogen, can prevent the gas
Body reacts with the substance in methanol, and then influences the purity of methanol.
Preferably, as shown in Figure 1, gas, which blasts, is equipped with the first on-off control valve 41 on pipeline 40.Pass through setting first
On-off control valve 41 can more easily control the gas and blast the on-off that pipeline 40 is passed through gas.
Preferably, gas, which blasts, is equipped with first flow regulating valve 42 on pipeline 40.By the way that first flow regulating valve is arranged
42, it can more easily control the size for the air-flow that gas blasts in pipeline 40.
Preferably, heat exchanger 20 includes shell 21 and cold recovery pipeline 22, and cold recovery pipeline 22 runs through shell 21, and
The import of heat exchanger 20 and the outlet of heat exchanger 20 be separately positioned on shell 21, and import and the heat exchanger 20 of heat exchanger 20
Outlet is separately positioned on the corresponding side of cold recovery pipeline 22.In this way, the heat exchanger can be improved largely
Heat exchange efficiency.
Preferably, the extending direction of cold recovery pipeline 22 is identical as the extending direction of shell 21, and prolonging along shell 21
The outlet of the import and heat exchanger 20 of stretching direction heat exchanger 20 is separately positioned on the both ends of shell 21.
Preferably, the methanol system of washing further includes stripping tower, and the outlet of heat exchanger 20 and the import of stripping tower connect.In this way,
It can more easily realize the gas proposed in methanol to be cleaned.
Preferably, the methanol system of washing further includes filter bypass line 50, and one end of filter bypass line 50 is connected to
On pipeline between filter 10 and heat exchanger 20, the other end of filter bypass line 50 is connected to methanol and is passed through pipeline 30
On.By the way that filter bypass line 50 is arranged, filter bypass flow control valve can be opened when filter 10 blocks
65 keep the methanol flux for entering heat exchanger 20.
In this application, it as shown in Figure 1, gas, which blasts, is equipped with first pressure gauge 43 on pipeline 40, filter 10 and changes
Second flow regulating valve 61 is installed, methanol, which is passed through on pipeline 30, is equipped with third flow control valve on the pipeline between hot device 20
62, methanol, which is passed through on pipeline 30, is equipped with second pressure gauge 63, is equipped with the 4th on the pipeline between heat exchanger 20 and stripping tower
Pressure gauge 64, filter bypass line 50 can open filter bypass flow control valve 65 when filter 10 blocks
Keep the methanol flux for entering heat exchanger 20.
It is an object of that present invention to provide a kind of methanol to wash system, reduces the instant parking process bring of each device of system
Loss, to improve and continue to device normal operating condition.
After the appearance of heat exchanger stopping state, each Chemical Manufacture enterprise usually takes progress physics clear on blocking heat exchanger
The method that reason, chemical cleaning or both combine carries out, and can play certain good effect to the improvement of blocking heat exchanger negotiability.
But since the above method is required to carry out after system shut-down, the completion of device production task certainly will be influenced；Taking
When learning cleaning measure, the adjustment of cleaning process parameter is improper, and the probability that chemical attack and interior leakage occur for heat exchanger will greatly increase.This
A little especially to the process units for taking woods moral low-temp methanol washing process, since its wound tube heat exchanger is vertical structure, to mention
High heat exchange efficiency, heat exchanger tube generally use thin-wall tube and are related to, and take chemical cleaning to generate the interior risk leaked and further increase.
In view of the foregoing, it is an object of that present invention to provide a kind of cleaning system for capableing of Hand scarf heat exchanger, subtract
The instant parking process bring loss of device is lacked, to improve and continue to device operating status.
To achieve the goals above, present invention design is realized by following technology contents:
(1) increasing an interim drum nitrogen pipeline around heat exchange of heat pipe entrance, nitrogen pipeline caliber regards heat exchanger entrance pipe
Road flux determines that nitrogen pressure and system pressure difference should be higher than that 1.0MPa, to guarantee to blast larger amount of nitrogen in time.
(2) nitrogen, which blasts, takes batch process, should follow that the time is short, fireballing principle when blasting.Scene is taken when blasting
Surveillance and control measure when preventing nitrogen amount excessive, causes pipe vibration larger and equipment superpressure situation.
(3) it by downstream regulation measure, blasts in nitrogen with constantly, cooperation takes the quick heat exchanger circulation that changes to arrange
It applies, further enhances Hydrodynamic turbulence degree in heat exchanger, improve practical disturbance effect after nitrogen is added.
(4) before nitrogen blasts, each methanol filter is in and comes into operation state in holding system, so as to can be by the miscellaneous of above-mentioned bulging
Matter is timely purged, and prevents from accumulating at other positions of system.
Compared with prior art, present invention tool has the advantage that and good effect:
(1) methanol for providing a kind of wound tube heat exchanger blocking online process processing washes system, improves heat exchanger and changes
Heat and circulation effect, avoid unnecessary device and stop immediately, reduce device operating cost；
(2) after reducing wound tube heat exchanger blocking, the heat exchanger for frequently taking chemical cleaning method to be easy to cause corrodes
Interior danger of leaking out, reduces equipment repair and maintenance expense caused by and.
It is carried out below with reference to DCL/Direct coal liquefaction project coal hydrogen manufacturing low temperature washing device for methanol-methanol cooler plugging handling example
Illustrate:
It is 450t/h that low temperature washing device for methanol, which designs normal methanol loop amount, and methanol cooler entrance normal pressure difference is
0.135MPa.The heat exchanger shell pass starts methanol flux limited situation occur within 2 months 2012, and system methanol loop is maximum when serious
Flux is reduced to only 330t/h, and heat exchanger inlet and outlet pressure difference is up to 0.45MPa.For this purpose, taking this device and in May, 2012 specially
The benefit following processing method:
Operating procedure is as follows:
1) at rich methanol filtering outlet (methanol cooler entrance), first with addition of 5.2MPa nitrogen pipeline (caliber: DN50),
Increase nitrogen flow simultaneously and adjusts hand valve.
2) after the completion of, using above-mentioned nitrogen flow adjust hand valve coordinated control pressure PI003 pressure 2.0~2.5MPa with
On, coarse adjustment nitrogen flow to 200~400m3/h。
3) while nitrogen blasts, by adjusting methanol cooler outlet control valve, substantially change methanol in heat exchanger
Circulation, and then enhance nitrogen blast methanol solution turbulence situation in rear heat exchanger.
3) after the above-mentioned nitrogen of holding is with addition of 3~5min of time, drum nitrogen valve is closed.
4) according to it is above-mentioned 2), 3) step, so recycle 2~5 times.
It can be seen from the above description that the above embodiments of the present invention realized the following chievements:
After taking this above-mentioned technical method processing, system methanol loop flux peak is improved to 400t/H the present invention, is changed
Hot device inlet outlet pressure differential is reduced to 0.25MPa or so, and operating performance of plant is clearly better.And repeatedly occur in the heat exchanger later
When flux declines situation, after taking this technology method to handle, heat exchanger flux limitation problem is alleviated significantly.Taking this place
When reason method, low temperature washing device for methanol further takes strengthen the system methanol solution management measure, better effect.
The foregoing is only a preferred embodiment of the present invention, is not intended to restrict the invention, for the skill of this field
For art personnel, the invention may be variously modified and varied.All within the spirits and principles of the present invention, made any to repair
Change, equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.
Claims (8)
1. a kind of methanol washes system, including filter (10) and heat exchanger (20), the feed inlet and methanol of the filter (10)
It is passed through pipeline (30) connection, the discharge port of the filter (10) is connect with the import of the heat exchanger (20), which is characterized in that
The methanol washes system further include:
Gas blasts pipeline (40), and the gas blasts pipeline (40) setting in the upstream of the import of the heat exchanger (20), uses
In to blasting gas to remove the impurity on the inner wall of the heat exchanger (20) in the heat exchanger (20)；
The gas blasts pipeline (40) and is connected on the filter (10)；
The methanol system of washing further includes filter bypass line (50), and one end of the filter bypass line (50) is connected to
On pipeline between the filter (10) and the heat exchanger (20), the other end of the filter bypass line (50) is connected
It is passed through on pipeline (30) in the methanol.
2. methanol according to claim 1 washes system, which is characterized in that the feed inlet of the filter (10) is arranged in institute
The lower end of filter (10) is stated, the discharge port of the filter (10) is arranged in the upper end of the filter (10), and the gas
Body blasts the top that pipeline (40) is connected to the filter (10).
3. methanol according to claim 1 washes system, which is characterized in that it is logical for nitrogen that the gas blasts pipeline (40)
Road.
4. methanol according to claim 1 washes system, which is characterized in that the gas, which blasts, is equipped on pipeline (40)
One on-off control valve (41).
5. methanol according to claim 1 washes system, which is characterized in that the gas, which blasts, is equipped on pipeline (40)
One flow control valve (42).
6. methanol according to claim 1 washes system, which is characterized in that the heat exchanger (20) includes shell (21) and cold
Measure recovery line (22), the cold recovery pipeline (22) run through the shell (21), and the import of the heat exchanger (20) and
The outlet of the heat exchanger (20) is separately positioned on the shell (21), and the import and the heat exchange of the heat exchanger (20)
The outlet of device (20) is separately positioned on the corresponding side of the cold recovery pipeline (22).
7. methanol according to claim 6 washes system, which is characterized in that the extending direction of the cold recovery pipeline (22)
It is identical as the extending direction of the shell (21), and along the import of heat exchanger (20) described in the extending direction of the shell (21) and
The outlet of the heat exchanger (20) is separately positioned on the both ends of the shell (21).
8. methanol according to claim 1 washes system, which is characterized in that the methanol system of washing further includes stripping tower, institute
The outlet for stating heat exchanger (20) is connect with the import of the stripping tower.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610141286.4A CN105779026B (en) | 2016-03-11 | 2016-03-11 | Methanol washes system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610141286.4A CN105779026B (en) | 2016-03-11 | 2016-03-11 | Methanol washes system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105779026A CN105779026A (en) | 2016-07-20 |
| CN105779026B true CN105779026B (en) | 2019-04-09 |
Family
ID=56393320
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610141286.4A Active CN105779026B (en) | 2016-03-11 | 2016-03-11 | Methanol washes system |
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| EP0651042A1 (en) * | 1993-10-28 | 1995-05-03 | RUHR OEL GmbH | Process for cleaning pressurized gases |
| CN102003915A (en) * | 2010-11-10 | 2011-04-06 | 天脊煤化工集团股份有限公司 | Device and method for processing pressure difference rise of low-temperature methanol washing crude gas precooling systems |
| CN102008847A (en) * | 2010-07-02 | 2011-04-13 | 陕西神木化学工业有限公司 | Cleaning method of bag filter used in low temperature methanol washing process |
| CN103115521A (en) * | 2012-11-11 | 2013-05-22 | 安徽金禾实业股份有限公司 | Device and method for tube type heat exchanger on-line washing |
| CN203469766U (en) * | 2013-09-03 | 2014-03-12 | 安徽淮化股份有限公司 | Deeply-desorbing and cold energy regenerating device for low-temperature methanol washing process |
| CN204447493U (en) * | 2015-01-14 | 2015-07-08 | 东华工程科技股份有限公司 | Rinse trapezoidal methyl alcohol filter thoroughly |
-
2016
- 2016-03-11 CN CN201610141286.4A patent/CN105779026B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0651042A1 (en) * | 1993-10-28 | 1995-05-03 | RUHR OEL GmbH | Process for cleaning pressurized gases |
| CN102008847A (en) * | 2010-07-02 | 2011-04-13 | 陕西神木化学工业有限公司 | Cleaning method of bag filter used in low temperature methanol washing process |
| CN102003915A (en) * | 2010-11-10 | 2011-04-06 | 天脊煤化工集团股份有限公司 | Device and method for processing pressure difference rise of low-temperature methanol washing crude gas precooling systems |
| CN103115521A (en) * | 2012-11-11 | 2013-05-22 | 安徽金禾实业股份有限公司 | Device and method for tube type heat exchanger on-line washing |
| CN203469766U (en) * | 2013-09-03 | 2014-03-12 | 安徽淮化股份有限公司 | Deeply-desorbing and cold energy regenerating device for low-temperature methanol washing process |
| CN204447493U (en) * | 2015-01-14 | 2015-07-08 | 东华工程科技股份有限公司 | Rinse trapezoidal methyl alcohol filter thoroughly |
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| 《不同甲醇洗工艺对设备选型的影响》;谢卫雄;《小氮肥》;20120731;第40卷(第7期);第25页右栏倒数第1段-第26页左栏第1段 |
| 《低温甲醇洗在壳牌煤制氢装置应用浅谈》;徐龙龙;《内蒙古石油化工》;20130930(第17期);第21页左栏第4段 |
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| CN105779026A (en) | 2016-07-20 |
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