CN114100322B - Online tower boiling method for methanol water tower in low-temperature methanol washing device - Google Patents
Online tower boiling method for methanol water tower in low-temperature methanol washing device Download PDFInfo
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- CN114100322B CN114100322B CN202111323964.6A CN202111323964A CN114100322B CN 114100322 B CN114100322 B CN 114100322B CN 202111323964 A CN202111323964 A CN 202111323964A CN 114100322 B CN114100322 B CN 114100322B
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- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 title claims abstract description 186
- GBMDVOWEEQVZKZ-UHFFFAOYSA-N methanol;hydrate Chemical compound O.OC GBMDVOWEEQVZKZ-UHFFFAOYSA-N 0.000 title claims abstract description 164
- 238000005406 washing Methods 0.000 title claims abstract description 58
- 238000009835 boiling Methods 0.000 title claims abstract description 38
- 238000000034 method Methods 0.000 title claims abstract description 23
- 239000007788 liquid Substances 0.000 claims abstract description 48
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 33
- 239000003513 alkali Substances 0.000 claims abstract description 18
- 230000001502 supplementing effect Effects 0.000 claims abstract description 11
- 238000010438 heat treatment Methods 0.000 claims abstract description 3
- 230000008929 regeneration Effects 0.000 claims description 41
- 238000011069 regeneration method Methods 0.000 claims description 41
- 238000010992 reflux Methods 0.000 claims description 18
- 238000002955 isolation Methods 0.000 claims description 6
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 5
- NWUYHJFMYQTDRP-UHFFFAOYSA-N 1,2-bis(ethenyl)benzene;1-ethenyl-2-ethylbenzene;styrene Chemical compound C=CC1=CC=CC=C1.CCC1=CC=CC=C1C=C.C=CC1=CC=CC=C1C=C NWUYHJFMYQTDRP-UHFFFAOYSA-N 0.000 claims description 2
- 150000001450 anions Chemical class 0.000 claims description 2
- 150000001767 cationic compounds Chemical class 0.000 claims description 2
- 239000000084 colloidal system Substances 0.000 claims description 2
- 229910001412 inorganic anion Inorganic materials 0.000 claims description 2
- 229910001411 inorganic cation Inorganic materials 0.000 claims description 2
- 239000003456 ion exchange resin Substances 0.000 claims description 2
- 229920003303 ion-exchange polymer Polymers 0.000 claims description 2
- 238000001223 reverse osmosis Methods 0.000 claims description 2
- 238000007599 discharging Methods 0.000 claims 1
- 238000004140 cleaning Methods 0.000 abstract description 7
- 239000007789 gas Substances 0.000 description 29
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 6
- 239000010865 sewage Substances 0.000 description 6
- 239000002253 acid Substances 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 239000002351 wastewater Substances 0.000 description 4
- 238000006477 desulfuration reaction Methods 0.000 description 3
- 230000023556 desulfurization Effects 0.000 description 3
- 238000001704 evaporation Methods 0.000 description 3
- 230000008020 evaporation Effects 0.000 description 3
- 238000003786 synthesis reaction Methods 0.000 description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 2
- 239000003245 coal Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- ZNZNXSDPNKCWNO-UHFFFAOYSA-N S.CO Chemical compound S.CO ZNZNXSDPNKCWNO-UHFFFAOYSA-N 0.000 description 1
- 229910021529 ammonia Inorganic materials 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000010883 coal ash Substances 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000010411 cooking Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000005262 decarbonization Methods 0.000 description 1
- 238000005261 decarburization Methods 0.000 description 1
- 238000011033 desalting Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 239000001760 fusel oil Substances 0.000 description 1
- 238000002309 gasification Methods 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 229910000037 hydrogen sulfide Inorganic materials 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 239000008213 purified water Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
- B01D53/18—Absorbing units; Liquid distributors therefor
Abstract
The invention belongs to the technical field of cleaning of methanol water towers, and particularly relates to an online tower boiling method of a methanol water tower in a low-temperature methanol washing device. The method comprises the following steps: step 1: the liquid level in the methanol water tower and the tail gas washing tower is reduced to the minimum liquid level; step 2: stopping a methanol water tower feeding pump which is connected to the methanol water tower, isolating a liquid inlet valve and a vapor outlet valve of the methanol water tower, and isolating the methanol water tower from a front-back system; step 3: replacing the liquid discharged from the methanol water tower by utilizing desalted water, and stopping water supplementing after the content of methanol in the replaced liquid is less than 0.5 percent and continuously supplementing desalted water into the tower until the liquid level of the tower kettle is 70-80 percent; step 4: adding alkali liquor into the methanol water tower until the pH value of the liquid in the tower kettle is controlled to be 8-10, and stopping alkali liquor addition; step 5: after confirming that the pressure of the methanol water tower is released to normal pressure, opening a top air vent, heating the boiling tower, and controlling the pressure in the tower to be not more than 0.2MPa during the boiling period. The method realizes that the low-temperature methanol washing device can clean the methanol water tower under the condition of no stop.
Description
Technical Field
The invention belongs to the technical field of cleaning of methanol water towers, and particularly relates to an online tower boiling method of a methanol water tower in a low-temperature methanol washing device.
Background
The low-temperature methanol washing device has mature technology and good application effect in industry, and is widely applied to gas purification such as synthesis of ammonia, synthesis of methanol and other oxo-synthesis, urban gas, industrial hydrogen production, natural gas desulfurization and the like. The device takes cold methanol as an absorption solvent, and utilizes the methanol to absorb acid gas (CO) at low temperature 2 、H 2 S, COS, etc.) has extremely good solubility, and can remove acid gas from raw material gas, and the acid gas removing method is a physical absorption method, and has the characteristic that other desulfurization and decarbonization technologies cannot be substituted.
The methanol water tower in the low-temperature methanol washing device is a sieve plate tower, and has the main functions that: the water content in the rectification separation system is within 1 percent, so that the washing effect of the low-temperature methanol washing device is ensured, and meanwhile, the methanol in the washing water of the tail gas washing tower is recovered to reduce the alcohol consumption of the device. Because the raw gas of the front system of the low-temperature methanol washing device, namely the coal gasification device, carries trace coal ash and other impurities, and the washing water sent by the tail gas washing tower contains trace fusel oil. The screen plate is blocked by stains which are easy to accumulate coal slime and oil organic matters on the screen plate of the methanol water tower after long-period operation, so that the pressure difference in the methanol water tower is higher during operation, the operation efficiency of the methanol water tower is reduced, and the water content in the top methanol steam exceeds the standard when the methanol water tower is flooded seriously, so that the system circulation methanol water content is high, and the decarburization and desulfurization effects of the crude gas (or raw gas) washing tower are affected. Meanwhile, the condition that the heavy components in the tower bottom of the methanol water tower exceed the standard can occur, and once the heavy components in the tower bottom exceed the standard, the COD of the discharged wastewater exceeds the standard, so that environmental protection accidents are easily caused to a sewage treatment system.
When the prior art is used for cleaning the methanol water tower, under the condition that the device is stopped, the tower plate of the methanol water tower is detached and then sent to the outside of the tower for cleaning, for example Shi Guiqing and the like, the following contents are disclosed in a solution of blocking a tower tray of a low-temperature methanol washing methanol water tower (Shi Guiqing. Solution of blocking a tower tray of the low-temperature methanol washing methanol water tower [ J ]. Chemical design communication, 2020, v.46; no.212 (02): 15-16.): the preparation work is firstly carried out, and then the following steps are carried out: (1) The middle two manholes (M2, M3/M4) are disassembled, the two manholes are divided into 4 pairs of disassembling trays, the disassembling trays are put into a methanol water tower after protective articles are worn, the middle tray plate in the methanol water tower is disassembled, and the disassembled tray plate is sent to the outside of the tower for cleaning. (2) The trays on the two sides which are not disassembled are cleaned by using a steel wire brush and are washed by fire water, and the disassembled trays are reassembled after being cleaned by using the steel wire brush on the ground. And (3) repairing the tower plate if the tower plate in the tower is damaged and falls off. (4) And after the treatment is finished, a manhole is immediately recovered, a blind plate is extracted, and a methanol water tower is prepared for starting. The above-mentioned dirt-removing work is carried out under the condition of stopping the equipment, so that its economic benefits are seriously affected.
Disclosure of Invention
The invention provides an online tower boiling method of a methanol water tower, which can effectively remove dirt on a tower plate of the methanol water tower, improve the separation efficiency of the methanol water tower and improve the operation cycle of the low-temperature methanol washing device by using the most economical method.
In order to solve the technical problems, the invention adopts the following technical scheme:
step 1: and (3) reducing the liquid level in the methanol water tower and the tail gas washing tower to the minimum liquid level. This step lowers the liquid level in order to drain the methanol-containing liquid in the methanol water tower and the tail gas scrubber.
Step 2: and stopping a methanol water tower feeding pump which is connected to the methanol water tower, closing and isolating a liquid inlet valve and a vapor outlet valve of the methanol water tower, and isolating the methanol water tower from a front-back system.
Specifically, a valve on a pipeline of the methanol steam heat removal regeneration tower at the top of the methanol water tower is closed and isolated; stopping the washing liquid delivery pump of the tail gas washing tower to the methanol water tower, and closing the inlet and outlet valves of the washing liquid delivery pump to isolate the washing liquid of the tail gas washing tower from the pipeline of the methanol water tower; stopping the feeding pump of the methanol water tower, closing the inlet and outlet valves of the feeding pump of the methanol water tower, and stopping feeding of the methanol water tower; the methanol water tower reflux line valve is closed and isolated. The purpose of the above steps is to allow the methanol water tower to no longer receive external methanol-containing liquid.
Further, after a valve on a pipeline of the methanol steam heat removal regeneration tower at the top of the methanol water tower is closed, a blind plate is added at the side of the methanol water tower for isolation; after the valve of the methanol water tower reflux pipeline is closed, a blind plate is added at the side of the methanol water tower for isolation.
Step 3: and replacing the liquid discharged from the methanol water tower by utilizing desalted water, and stopping water supplementing after the content of methanol in the replaced liquid is less than 0.5%, continuously supplementing desalted water into the tower to 70% -80% of the liquid level of the tower kettle.
Wherein, the desalted water is fed into the tower for replacement through the guide shower of the feeding pipeline of the methanol water tower and the reflux pipeline of the methanol water tower. The desalted water is purified water obtained by removing suspended matters, colloid, inorganic cations, anions and other impurities in water through reverse osmosis, ion exchange resin and other processes.
Step 4: and (5) adding alkali liquor into the methanol water tower until the pH value of the liquid in the tower kettle is controlled to be 8-10, and stopping alkali liquor addition.
Wherein, the alkali liquor is fed into the tower through a methanol water tower alkali liquor feeding pipeline connected to the methanol water tower.
Step 5: after confirming that the pressure of the methanol water tower is released to normal pressure, opening a top air vent, heating the boiling tower, and controlling the pressure in the tower to be not more than 0.2MPa during the boiling period.
Wherein the time of the boiling tower is 18-24 hours.
During the online boiling of the methanol water tower 02, the methanol water at the bottom of the thermal regeneration tower is discharged to a dirty alcohol tank of the methanol rectifying device, and the discharge amount is controlled so as to ensure that the methanol water content in the thermal regeneration tower is qualified.
The invention has the positive beneficial effects that:
1. the invention ensures that the pressure difference of the methanol water tower of the low-temperature methanol washing device runs stably at 15-20 KPa, thereby ensuring the normal of other parameter indexes.
2. The invention avoids the problem of gas cutting and stopping of the methanol device caused by high pressure difference of the methanol water tower, improves the operation period of the methanol device, and further improves the economic benefit of companies. According to the long-period running condition of the methanol water tower of the low-temperature methanol washing device, the internal dirt cleaning treatment is needed to be carried out on the methanol water tower once every year, the problem of shutdown treatment caused by high pressure difference of the methanol water tower can be effectively avoided through online tower boiling dirt cleaning, and the consumption and maintenance cost of each time of starting and stopping are about 150 ten thousand, so that the cost can be saved by about 150 ten thousand every year.
Drawings
FIG. 1 is a schematic diagram of the heat regeneration tower, methanol water tower and tail gas scrubber of a low temperature methanol washing apparatus.
01 is a thermal regeneration tower, 02 is a methanol water tower, and 03 is a tail gas washing tower;
1 is a methanol steam heat removal regeneration tower pipeline, 2 is a vent, 3 is a methanol water tower reflux pipeline, 4 is a methanol water tower alkali liquor supplementing pipeline, 5 is a methanol water tower feeding pipeline, 51 is a methanol water tower feeding pump, 6 is a washing liquid methanol water tower removing pipeline, 61 is a washing liquid conveying pump, 7 is a sewage pipeline, 8 is a lean methanol pump inlet pipeline, 9 is a lean methanol pump reflux pipeline, 10 is a heat regeneration tower reboiler pipeline outlet pipeline, 11 is a heat regeneration tower reboiler pipeline inlet pipeline, 12 is a water supplementing pipeline, 13 is a tail gas inlet pipeline, 14 is a heat regeneration tower reflux pump reflux methanol feeding pipeline, 15 is a heat regeneration tower pre-washing flash evaporation methanol feeding pipeline, 16 is a heat regeneration tower hydrogen sulfide methanol feeding pipeline, 17 is a heat regeneration tower first-stage acid gas flash steam outlet pipeline, 18 is a methanol water tower reboiler pipeline outlet pipeline, and 19 is a methanol water tower reboiler pipeline inlet pipeline.
Detailed Description
The following detailed description of the present invention is provided to facilitate understanding of the technical solution of the present invention, but is not intended to limit the scope of the present invention.
Example 1
The connection pipelines among the thermal regeneration tower, the methanol water tower and the tail gas washing tower in the online tower boiling process of the methanol water tower are described with reference to fig. 1.
As shown in fig. 1, a heat regeneration tower 01 is arranged at the upstream of a methanol water tower 02, a tail gas washing tower 03 is arranged at the downstream of the methanol water tower 02, methanol steam of the methanol water tower 02 enters the heat regeneration tower 01 through a methanol steam heat removal regeneration tower pipeline 1 arranged at the top, and a vent 2 is also arranged at the top of the methanol water tower 02. The upper portion of the methanol water tower 02 is provided with a methanol water tower reflux pipeline 3, the bottom is provided with a methanol water tower reboiler tube side inlet pipeline 19 and a sewage pipeline 7, and one side of the methanol water tower 02 is also provided with a methanol water tower reboiler tube side outlet pipeline 18, a methanol water tower feeding pipeline 5, a methanol water tower alkali liquor supplementing pipeline 4 and a washing liquid methanol water tower removing pipeline 6.
The methanol steam heat removal regeneration tower pipeline 1 at the top of the methanol water tower 02 is connected with the side part of the heat regeneration tower 01, the methanol water tower feeding pipeline 5 at one side of the methanol water tower 02 is connected with the bottom of the heat regeneration tower 01, and the methanol water tower feeding pipeline 5 is provided with a methanol water tower feeding pump 51. A washing liquid methanol removing water tower pipeline 6 on one side of the methanol water tower 02 is connected with the bottom of the tail gas washing tower 03, and a washing liquid conveying pump 61 is arranged on the washing liquid methanol removing water tower pipeline 6.
The bottom of the thermal regeneration tower 01 is also connected with a thermal regeneration tower reboiler through a thermal regeneration tower reboiler tube side inlet pipeline 11, and the thermal regeneration tower reboiler is connected with the lower part of the thermal regeneration tower 01 through a thermal regeneration tower reboiler tube side outlet pipeline 10. One side of the thermal regeneration tower 01 is provided with a lean methanol pump inlet pipeline 8, a lean methanol pump reflux pipeline 9, a thermal regeneration tower reflux pump reflux methanol feed pipeline 14, a thermal regeneration tower pre-washing flash evaporation methanol feed pipeline 15, the upper part of the thermal regeneration tower 01 is provided with a thermal regeneration tower hydrogen sulfide-rich methanol feed pipeline 16, and the top is provided with a thermal regeneration tower primary acid gas flash evaporation steam outlet pipeline 17.
The lower part of the tail gas washing tower 03 is connected with a tail gas inlet pipeline 13, and the upper part is connected with a desalting water supplementing pipeline 12.
The online tower boiling method of the methanol water tower in the low-temperature methanol washing device comprises the following steps:
1. the liquid level at the bottom of the methanol water tower 02 and the liquid level of the tail gas washing tower 03 are reduced to the minimum liquid level according to the operation rules. And (3) on the premise that the discharged waste liquid is qualified, delivering the waste liquid to a sewage treatment plant.
2. Slowly closing a valve on a methanol steam heat removal regeneration tower pipeline 1 at the top of the methanol water tower 02, and adding a blind plate on the side of the methanol water tower 02 on the methanol steam heat removal regeneration tower pipeline 1 for isolation;
stopping the washing liquid delivery pump 61 of the tail gas washing tower, closing the valves related to the pump inlet and outlet to isolate the washing liquid of the tail gas washing tower 03 from the methanol water tower pipeline 6 and stopping the methanol water from being delivered to the methanol water tower 02;
stopping the feeding pump 51 of the methanol water tower, closing the inlet and outlet valves of the pump, and stopping feeding of the methanol water tower;
closing the valve of the methanol water tower reflux pipeline 3, and adding a blind plate on the side of the methanol water tower 02 on the methanol water tower reflux pipeline 3 for isolation.
3. Liquid discharge replacement of the methanol water tower 02: and the demineralized water is respectively fed into the tower for replacement through the guide shower of the methanol water tower feeding pipeline 5 and the guide shower of the methanol water tower reflux pipeline 3, the replacement liquid is sent to a sewage plant for treatment until the methanol content in the replacement liquid is less than 0.5 percent and is qualified, and the water is stopped after the demineralized water is continuously fed into the tower until the liquid level of the tower kettle reaches 70 to 80 percent.
4. And (3) adding alkali liquor into the methanol water tower 02 through the alkali liquor adding pipeline 4 of the methanol water tower until the pH value of the tower kettle is controlled to be 8-10, and stopping alkali liquor adding. The alkali liquor can be prepared by adopting flaky sodium hydroxide in an on-site alkali distribution tank of a methanol rectifying device by using desalted water, and the content of the sodium hydroxide is about 2 percent.
5. Boiling tower operation: after confirming that the pressure of the methanol water tower 02 is released to normal pressure, the top vent 2 is opened, and the tower kettle steam is controlled to heat and boil the tower. The pressure in the tower is controlled to be not more than 0.2MPa during the boiling period. After the liquid of the boiling tower of the methanol water tower 02 is discharged, the liquid is flushed from the guide shower position at the bottom of the methanol water tower 02, and the flushed waste water is collected by an accident pool and then is sent to a sewage plant for treatment. Wherein the time of the boiling tower is 18-24 hours.
6. During the online boiling of the methanol water tower 02, the methanol water at the bottom of the thermal regeneration tower 01 is discharged to a dirty alcohol tank of the methanol rectifying device, and the discharge amount is controlled so as to ensure that the methanol water content in the thermal regeneration tower 01 is qualified.
In the above steps, it should be noted that:
1. before the online tower of boiling of methyl alcohol water tower, ensure that the system has effectively kept apart around, the inside raffinate of methyl alcohol water tower has been replaced the analysis and is qualified, avoid boiling the methyl alcohol and cross into the methyl alcohol water tower and cause the incident of environmental protection during the tower.
2. The pressure of the methanol water tower is strictly controlled to be not more than 0.2MPa during the online tower boiling. The pressure not exceeding 0.2MPa is determined according to the normal operation pressure index of the methanol water tower, and the operation pressure is between 0.19 and 0.2MPa under the normal operation working condition.
The specific application of the online tower boiling method is as follows:
workers find that the pressure difference fluctuation frequently occurs in the operation process of the low-temperature methanol washing device and the pressure difference rises to 52KPa at the highest pressure difference, so that the methanol content of the waste water at the bottom of the methanol water tower is seriously exceeded, and meanwhile, the water content of the methanol steam at the top of the tower is unqualified, so that the water content of a system of the low-temperature methanol washing device is continuously exceeded, and the safe and stable operation of the device is seriously threatened. In order to ensure the stable operation of the device, the on-line tower boiling treatment is carried out on the methanol water tower 02 by adopting an on-line tower boiling method, the normal operation of the methanol water tower is recovered after the operation of the tower boiling is finished the next day, the pressure difference of the methanol water tower 02 is reduced to be within 30kpa, the methanol content of the bottom wastewater is less than or equal to 100ppm, the water content of the top alcohol steam is less than or equal to 1%, and all indexes are recovered to be within the normal index range, so that the safe and stable operation of the methanol device is effectively ensured.
Condition optimization of a cooking tower
Through exploring the operation process of the boiling tower, the effect of recovering operation after the boiling tower is better under the conditions that alkali liquor is added and the boiling tower time is 18-24 hours is finally obtained. Specific examples are shown in the following table.
The above-described embodiments are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention, so that all equivalent changes or modifications of the structure, characteristics and principles described in the claims should be included in the scope of the present invention.
Claims (5)
1. The online tower boiling method of the methanol water tower in the low-temperature methanol water washing device is characterized by comprising the following steps of:
step 1: the liquid level in the methanol water tower (02) and the tail gas washing tower (03) is reduced to the minimum liquid level;
step 2: stopping a methanol water tower feeding pump (51) of the methanol water tower (02), closing and isolating a liquid inlet valve and a vapor outlet valve of the methanol water tower (02), isolating the methanol water tower (02) from a front-back system, and isolating the methanol water tower from the front-back system, wherein the steps comprise the following steps:
closing and isolating a valve on a methanol steam heat removal regeneration tower pipeline (1) at the top of a methanol water tower (02);
a washing liquid delivery pump (61) of the tail gas stopping washing tower (03) which goes to the methanol water tower (02) is used for closing an inlet valve and an outlet valve of the washing liquid delivery pump (61);
stopping the methanol water tower feeding pump (51), closing the inlet and outlet valves of the methanol water tower feeding pump (51), and stopping feeding of the methanol water tower (02);
closing and isolating a valve on a methanol water tower reflux pipeline (3);
step 3: replacing the liquid discharged by the methanol water tower (02) by desalted water, and stopping water supplementing after the content of methanol in the replacement liquid is less than 0.5 percent, continuously supplementing desalted water into the methanol water tower (02) to 70-80 percent of the liquid level of the tower kettle;
step 4: adding alkali liquor into the methanol water tower (02) until the pH value of the liquid in the tower kettle is controlled to be 8-10, and stopping alkali liquor addition;
step 5: after confirming that the pressure of the methanol water tower (02) is released to normal pressure, opening a top vent (2) of the tower, heating the boiling tower, and controlling the pressure in the tower to be not more than 0.2Mpa during the boiling period;
and during the online boiling period of the methanol water tower (02), discharging the methanol water at the bottom of the thermal regeneration tower (01) to a dirty alcohol tank of the methanol rectifying device, and ensuring that the methanol water content in the thermal regeneration tower is qualified by controlling the discharge amount.
2. The on-line tower boiling method for a methanol water tower in a low-temperature methanol water washing device according to claim 1, wherein after a valve on a methanol steam desuperheating regeneration tower pipeline (1) at the top of the methanol water tower (02) is closed, a blind plate is added at the side of the methanol water tower (02) on the methanol steam desuperheating regeneration tower pipeline (1) for isolation; after the valve of the methanol water tower reflux pipeline (3) is closed, a blind plate is added on the methanol water tower (02) side on the methanol water tower reflux pipeline (3) for isolation.
3. The method for on-line boiling of a methanol water tower in a low-temperature methanol water washing device according to claim 1, wherein the desalted water is replaced by supplementing desalted water into the tower respectively through a methanol water tower feeding pipeline (5) and a methanol water tower reflux pipeline (3); the desalted water is pure water obtained by removing suspended matters, colloid and inorganic cations and anions through a reverse osmosis or ion exchange resin process.
4. The method for on-line boiling of a methanol water tower in a low-temperature methanol water washing device according to claim 1, wherein the alkali liquor is fed into the tower through a methanol water tower alkali liquor feeding pipeline (4) connected to the methanol water tower.
5. The method for on-line boiling of a methanol water tower in a low temperature methanol water washing apparatus as claimed in claim 1, wherein the boiling time is 24 to 30 hours.
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| CN210385374U (en) * | 2019-07-29 | 2020-04-24 | 河南心连心化学工业集团股份有限公司 | Acid gas methanol recovery device in low-temperature methanol washing process |
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2021
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| SU971463A1 (en) * | 1981-04-08 | 1982-11-07 | Предприятие П/Я А-1748 | Gas cleaning apparatus |
| CN101837225A (en) * | 2009-03-16 | 2010-09-22 | 和舰科技(苏州)有限公司 | System for preventing isopropanol scrubber from being clogged |
| CN104072366A (en) * | 2013-03-29 | 2014-10-01 | 池银萍 | Preparation method of dibutyl phthalate (DBP) |
| CN210385374U (en) * | 2019-07-29 | 2020-04-24 | 河南心连心化学工业集团股份有限公司 | Acid gas methanol recovery device in low-temperature methanol washing process |
| CN110791327A (en) * | 2019-11-13 | 2020-02-14 | 中建安装集团有限公司 | Device and process for deeply removing purified gas sulfide of low-temperature methanol washing system |
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