CN114100322A - Methanol water tower on-line tower boiling method in low-temperature methanol washing device - Google Patents
Methanol water tower on-line tower boiling method in low-temperature methanol washing device Download PDFInfo
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- CN114100322A CN114100322A CN202111323964.6A CN202111323964A CN114100322A CN 114100322 A CN114100322 A CN 114100322A CN 202111323964 A CN202111323964 A CN 202111323964A CN 114100322 A CN114100322 A CN 114100322A
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- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 title claims abstract description 189
- GBMDVOWEEQVZKZ-UHFFFAOYSA-N methanol;hydrate Chemical compound O.OC GBMDVOWEEQVZKZ-UHFFFAOYSA-N 0.000 title claims abstract description 166
- 238000005406 washing Methods 0.000 title claims abstract description 58
- 238000009835 boiling Methods 0.000 title claims abstract description 42
- 238000000034 method Methods 0.000 title claims abstract description 25
- 239000007788 liquid Substances 0.000 claims abstract description 48
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 34
- 239000003513 alkali Substances 0.000 claims abstract description 17
- 239000013589 supplement Substances 0.000 claims abstract description 6
- 238000010438 heat treatment Methods 0.000 claims abstract description 4
- 230000008929 regeneration Effects 0.000 claims description 42
- 238000011069 regeneration method Methods 0.000 claims description 42
- 238000010992 reflux Methods 0.000 claims description 14
- 238000002955 isolation Methods 0.000 claims description 7
- 230000001502 supplementing effect Effects 0.000 claims description 6
- 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
- 238000004140 cleaning Methods 0.000 abstract description 6
- 238000005202 decontamination Methods 0.000 abstract description 3
- 230000003588 decontaminative effect Effects 0.000 abstract description 3
- 239000007789 gas Substances 0.000 description 29
- HEMHJVSKTPXQMS-UHFFFAOYSA-M sodium hydroxide Inorganic materials [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 8
- 239000010865 sewage Substances 0.000 description 6
- 239000002253 acid Substances 0.000 description 5
- 239000002351 wastewater Substances 0.000 description 5
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 3
- 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
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- 238000010521 absorption reaction Methods 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
- 229910000037 hydrogen sulfide Inorganic materials 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
- 239000000243 solution Substances 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 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
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000012267 brine Substances 0.000 description 1
- 238000005518 chemical engineering design Methods 0.000 description 1
- 239000010883 coal ash Substances 0.000 description 1
- 239000003034 coal gas Substances 0.000 description 1
- 238000004891 communication 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
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging 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
- 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
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 230000008092 positive effect Effects 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
- 239000002994 raw material Substances 0.000 description 1
- 238000005201 scrubbing Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000009469 supplementation Effects 0.000 description 1
- -1 suspended matters Substances 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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- 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
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
The invention belongs to the technical field of methanol water tower cleaning, and particularly relates to an online tower boiling method for a methanol water tower in a low-temperature methanol cleaning device. The method comprises the following steps: step 1: reducing the liquid level in the methanol water tower and the tail gas washing tower to the lowest liquid level; step 2: stopping a methanol water tower feeding pump of 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 system and a rear system; and step 3: the discharged liquid of the methanol-water tower is replaced by desalted water, and after the content of methanol in the replaced liquid is less than 0.5 percent, the desalted water is continuously supplemented into the tower until the liquid level of the tower kettle is 70 to 80 percent, and then the water supplement is suspended; and 4, step 4: adding alkali liquor into the methanol water tower until the pH value of liquid in the tower kettle is controlled to be 8-10, and stopping adding the alkali liquor; and 5: and after confirming that the pressure of the methanol water tower is released to the normal pressure, opening a vent at the top of the tower, heating the boiling tower, and controlling the pressure in the tower during the boiling tower to be not more than 0.2 MPa. The method realizes the decontamination of the methanol water tower by the low-temperature methanol washing device under the condition of no stop.
Description
Technical Field
The invention belongs to the technical field of methanol water tower cleaning, and particularly relates to an online tower boiling method for a methanol water tower in a low-temperature methanol cleaning device.
Background
The low-temperature methanol washing device has mature technology, has good application effect in industry, and is widely applied to gas purification such as ammonia synthesis, methanol synthesis and other oxo synthesis, city gas, industrial hydrogen production, natural gas desulfurization and the like. The device takes cold methanol as an absorption solvent, and utilizes the methanol to treat acid gas (CO) at low temperature2、H2S, COS, etc.) and the acid gas in the raw material gas is removedThe acid gas removing method is a physical absorption method and has the characteristic that other desulfurization and decarburization technologies cannot replace the method.
The methanol water tower in the low-temperature methanol washing device is a sieve plate tower, and has the main functions of: the water content in the circulating methanol is enabled to be within 1% by the water in the rectification separation system, so that the washing effect of the low-temperature methanol washing device is ensured, and the methanol in the washing water of the tail gas washing tower is recycled to reduce the alcohol consumption of the device. The crude coal gas of the coal gasification device, which is the front system of the low-temperature methanol washing device, carries a trace of coal ash and other impurities, and meanwhile, the washing water sent by the tail gas washing tower contains a trace of fusel oil. After long-period operation, stains of coal slime and oil organic matters are easily accumulated on a sieve plate of the methanol water tower to block the sieve plate, 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 methanol water tower is flooded seriously, so that the water content in methanol steam at the top exceeds the standard, further the water content of system circulating methanol is high, and the decarbonization and desulfurization effects of a crude gas (or raw gas) washing tower are influenced. And simultaneously, the heavy components of the tower kettle of the methanol water tower exceed the standard, once the heavy components of the tower kettle exceed the standard, COD (chemical oxygen demand) of the discharged wastewater exceeds the standard, and environmental protection accidents are easily caused to a sewage treatment system.
In the prior art, when a methanol water tower is cleaned, a tower plate of the methanol water tower needs to be detached and then sent to the outside of the tower for cleaning under the condition that a device is stopped, for example, the following contents are disclosed in a scheme of 'blockage solution of a tower tray of a low-temperature methanol water washing tower' (the scheme of blockage of the tower tray of the low-temperature methanol water washing tower [ J ] chemical engineering design communication, 2020, v.46; No.212(02):15-16 >): firstly, preparing, and then carrying out the following steps: (1) two manholes (M2, M3/M4) in the middle are disassembled, the two manholes are divided into 4 pairs of disassembled trays, the protective articles are worn and then the trays are conveyed to the methanol water tower, the middle tower plate in the methanol water tower is disassembled, and the disassembled tower plate is conveyed to the outside of the tower to be cleaned. (2) The tower trays on two sides which are not disassembled are cleaned by using the steel wire brushes and are washed by fire water, and the disassembled tower trays are assembled again after being cleaned by the steel wire brushes on the ground. (3) If the tower plate in the tower is damaged and falls off, the tower plate is repaired. (4) And (5) immediately returning to the manhole after the treatment is finished, extracting the blind plate, and preparing for driving the methanol water tower. The above-mentioned decontamination work is carried out under the condition that the device is stopped, and the economic benefit is seriously influenced.
Disclosure of Invention
The invention provides an online boiling method of a methanol water tower, which aims to realize the decontamination of the methanol water tower under the condition that a low-temperature methanol washing device does not stop.
In order to solve the technical problems, the invention adopts the technical scheme that:
step 1: the liquid levels in the methanol water tower and the tail gas washing tower are reduced to the minimum liquid level. This step of lowering the liquid level is to discharge the methanol-containing liquid from the methanol water tower and the tail gas washing tower.
Step 2: and stopping a methanol water tower feeding pump going 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 the front system and the rear system.
Specifically, closing and isolating a valve on a methanol steam heat removal regeneration tower pipeline at the top of the methanol water tower; stopping the tail gas washing tower from going to a washing liquid delivery pump of the methanol water tower, and closing an inlet valve and an outlet valve of the washing liquid delivery pump to isolate the washing liquid of the tail gas washing tower from going to a methanol water tower pipeline; 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 make the methanol water tower not 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 on the side of the methanol water tower for isolation; after a return line valve of the methanol water tower is closed, a blind plate is added on the side of the methanol water tower for isolation.
And step 3: and (3) replacing the discharged liquid of the methanol-water tower by desalted water, and continuing to supplement desalted water into the tower until the liquid level of the tower kettle reaches 70-80% after the content of methanol in the replaced liquid is less than 0.5%.
Wherein, the demineralized water is replaced by supplementing demineralized water into the tower through the methanol water tower feeding pipeline and the methanol water tower reflux pipeline respectively. The desalted water is pure water obtained after impurities in water such as suspended matters, colloid, inorganic cations and anions are removed through processes such as reverse osmosis and ion exchange resin.
And 4, step 4: and (3) 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 then stopping adding the alkali liquor.
Wherein the alkali liquor is supplemented into the tower through a methanol water tower alkali liquor supplementing pipeline connected to the methanol water tower.
And 5: and after confirming that the pressure of the methanol water tower is released to the normal pressure, opening a vent at the top of the tower, heating the boiling tower, and controlling the pressure in the tower during the boiling tower to be not more than 0.2 MPa.
Wherein the tower boiling time is 18-24 hours.
During the online boiling tower of methanol water tower 02, discharging the methanol water at the bottom of the thermal regeneration tower to the dirty alcohol tank of the methanol rectification device, thereby ensuring that the methanol water content in the thermal regeneration tower is qualified by controlling the discharge amount.
The invention has the positive and beneficial effects that:
1. the invention ensures that the pressure difference of the methanol water tower of the low-temperature methanol washing device stably operates at 15-20 KPa, thereby ensuring the normality of other parameter indexes.
2. The invention avoids the problem that the methanol device is cut off and stopped due to high pressure difference of the methanol water tower, improves the operation period of the methanol device and further improves the economic benefit of a company. According to the long-period operation condition of the methanol water tower of the low-temperature methanol washing device, the methanol water tower needs to be internally cleaned once every year, the problem of shutdown treatment caused by high pressure difference of the methanol water tower can be effectively solved by online boiling and cleaning, the shutdown consumption and maintenance cost are about 150 ten thousand each time, and therefore the cost can be saved by about 150 ten thousand each year.
Drawings
FIG. 1 is a schematic diagram of the thermal regeneration column, methanol water tower and tail gas washing column 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 supplement pipeline, 5 is a methanol water tower feeding pipeline, 51 is a methanol water tower feeding pump, 6 is a washing liquid methanol removal water tower pipeline, 61 is a washing liquid delivery pump, 7 is a sewage pipeline, 8 is a poor methanol pump inlet pipeline, 9 is a poor methanol pump reflux pipeline, 10 is a heat regeneration tower reboiler tube pass outlet pipeline, 11 is a heat regeneration tower reboiler tube pass inlet pipeline, 12 is a supplement brine 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-rich methanol feeding pipeline, 17 is a heat regeneration tower section acid gas flash gas outlet pipeline, 18 is a methanol water tower reboiler tube pass outlet pipeline, and 19 is a methanol water tower reboiler tube pass inlet pipeline.
Detailed Description
The present invention will be described in more detail with reference to the following embodiments for understanding the technical solutions of the present invention, but the present invention is not limited to the scope of the present invention.
Example 1
In this embodiment, the connecting lines among the heat regeneration tower, the methanol water tower and the tail gas washing tower involved in the methanol water tower on-line boiling process are first described with reference to fig. 1.
As shown in figure 1, a thermal 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, methanol steam of the methanol water tower 02 enters the thermal regeneration tower 01 through a methanol steam heat removal regeneration tower pipeline 1 arranged at the top, and a vent 2 is further arranged at the top of the methanol water tower 02. Methanol water tower 02's upper portion is provided with methanol water tower return line 3, and the bottom is provided with methanol water tower reboiler tube side entry pipeline 19 and sewage line 7, and one side of methanol water tower 02 still is provided with methanol water tower reboiler tube side export pipeline 18, methanol water tower feed line 5, methanol water tower alkali lye make-up pipeline 4 and washing liquid go methanol water tower pipeline 6.
Methanol steam heat removal regeneration tower pipeline 1 at the top of methanol water tower 02 is connected with the side of heat regeneration tower 01, methanol water tower feed pipeline 5 at one side of methanol water tower 02 is connected with the bottom of heat regeneration tower 01, and methanol water tower feed pump 51 is arranged on methanol water tower feed pipeline 5. The washing liquid that methanol water tower 02 one side goes methanol water tower pipeline 6 and is connected with the bottom of tail gas scrubbing tower 03, is provided with washing liquid delivery pump 61 on the washing liquid goes methanol water tower pipeline 6.
The bottom of the heat regeneration tower 01 is also connected with a heat regeneration tower reboiler through a heat regeneration tower reboiler tube side inlet pipeline 11, and the heat regeneration tower reboiler is connected with the lower part of the heat regeneration tower 01 through a heat regeneration tower reboiler tube side outlet pipeline 10. One side of the thermal regeneration tower 01 is provided with a poor methanol pump inlet pipeline 8, a poor methanol pump reflux pipeline 9, a thermal regeneration tower reflux pump reflux methanol feeding pipeline 14 and a thermal regeneration tower prewashing flash evaporation methanol feeding pipeline 15, the upper part of the thermal regeneration tower 01 is provided with a thermal regeneration tower rich hydrogen sulfide methanol feeding pipeline 16, and the top part of the thermal regeneration tower 01 is provided with a thermal regeneration tower first-stage acid gas flash evaporation gas 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 methanol water tower on-line boiling method in the low-temperature methanol washing device comprises the following steps:
1. and (4) reducing the liquid level at the bottom of the methanol water tower 02 and the liquid level of the tail gas washing tower 03 to the lowest liquid level according to the operation rules. And the discharged waste liquid is delivered to a sewage treatment plant on the premise that the waste water is qualified.
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 methanol water tower 02 side on the methanol steam heat removal regeneration tower pipeline 1 for isolation;
stopping the tail gas washing tower washing liquid delivery pump 61, closing relevant valves at the inlet and the outlet of the pump to isolate the washing liquid of the tail gas washing tower 03 from entering the methanol water tower pipeline 6, and stopping sending methanol water 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 the methanol water tower;
the valve of the methanol water tower reflux pipeline 3 is closed, and a blind plate is added on the side of the methanol water tower 02 on the methanol water tower reflux pipeline 3 for isolation.
3. And (3) liquid drainage replacement of a methanol water tower 02: and supplementing desalted water into the tower for replacement through a methanol water tower feeding pipeline 5 and a methanol water tower reflux pipeline 3 respectively, sending the replacement liquid to a sewage plant for treatment, and continuing to supplement desalted water into the tower until the methanol content in the replacement liquid is less than 0.5 percent, and suspending water supplementation after the desalted water is continuously supplemented to the tower until the liquid level of a tower kettle is 70-80 percent.
4. And (3) adding alkali liquor into the methanol water tower 02 through an 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 then stopping adding the alkali liquor. The alkali liquor can be prepared by using sheet sodium hydroxide and desalted water in an on-site alkali preparation tank of a methanol rectification device, and the content of the sodium hydroxide is about 2 percent.
5. Boiling the tower: after confirming that the pressure of the methanol water tower 02 is released to the normal pressure, opening a vent 2 at the top of the tower, heating by controlling steam in a tower kettle, and boiling the tower. The pressure in the tower is controlled not to exceed 0.2MPa during the boiling period. After liquid in the methanol water tower 02 boiling tower is discharged, the liquid is guided from the bottom of the methanol water tower 02 to be washed, and the washed wastewater is collected by an accident pool and then sent to a sewage plant for treatment. Wherein the tower boiling time is 18-24 hours.
6. During the online boiling of 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 rectification device, and the discharge amount is controlled 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 methanol water tower is boiled on line, the front system and the rear system are effectively isolated, and residual liquid in the methanol water tower is replaced and analyzed to be qualified, so that the safety and environmental protection accidents caused by methanol entering the methanol water tower during boiling are avoided.
2. The methanol water tower pressure is strictly controlled not to exceed 0.2MPa during the on-line boiling tower. The pressure of not more than 0.2MPa is determined according to the normal operation pressure index of the methanol water tower, and the operation pressure under the normal operation working condition is between 0.19 and 0.2 MPa.
The specific application of the on-line tower boiling method is as follows:
the staff discovers that pressure difference fluctuation frequently appears in low temperature methanol washing device methanol water tower 02 in the operation process, and the highest time pressure difference rises to 52KPa, causes that methanol water tower bottom waste water methanol content seriously exceeds standard, and water content is unqualified in the top of the tower methanol steam simultaneously, and then leads to low temperature methanol washing device system water content constantly to exceed standard, seriously threatens the safety and stability operation of device. In order to ensure the stable operation of the device, the methanol water tower 02 is subjected to online boiling treatment by an online boiling method, the normal operation of the methanol water tower is recovered the next day after the boiling operation is finished, the pressure difference of the methanol water tower 02 is reduced to be within 30kpa, the methanol content of bottom wastewater is less than or equal to 100ppm, the water content of top alcohol vapor is less than or equal to 1%, all indexes are recovered to be within the normal index range, and the safe and stable operation of the methanol device is effectively ensured.
Boiling tower condition optimization
And finally, the better effect of recovering the operation of the boiling tower after the boiling tower is added under the condition that the time of the boiling tower is 18-24 hours is obtained by exploring the operation process of the boiling tower. Specific cases are shown in the following table.
The above-described embodiments are merely preferred embodiments of the present invention, and not intended to limit the scope of the invention, so that equivalent changes or modifications in the structure, features and principles described in the present invention should be included in the claims of the present invention.
Claims (7)
1. An on-line tower boiling method for a methanol water tower in a low-temperature methanol washing device is characterized by comprising the following steps:
step 1: the liquid levels in the methanol water tower (02) and the tail gas washing tower (03) are reduced to the minimum liquid level;
step 2: stopping a methanol water tower feeding pump (51) going to the methanol water tower (02), closing and isolating a liquid inlet valve and a vapor outlet valve of the methanol water tower (02), and isolating the methanol water tower (02) from a front system and a rear system;
and step 3: the drained liquid of the methanol water tower (02) is replaced by desalted water, and after the content of methanol in the replacement liquid is less than 0.5 percent, the desalted water is continuously supplemented into the methanol water tower (02) until the liquid level of a tower kettle is 70 to 80 percent, and then the water supplement is suspended;
and 4, step 4: adding alkali liquor into the methanol water tower (02) until the pH value of liquid in the tower kettle is controlled to be 8-10, and stopping adding the alkali liquor;
and 5: after confirming that the pressure of the methanol water tower (02) is released to the normal pressure, opening a vent (2) at the top of the tower, heating the boiling tower, and controlling the pressure in the tower during the boiling tower to be not more than 0.2 MPa.
2. The on-line boiling method of the methanol water tower in the low-temperature methanol water washing device as claimed in claim 1, wherein the isolation of the methanol water tower from the front and rear systems comprises the following steps:
closing and isolating a valve on a methanol steam heat removal regeneration tower pipeline (1) at the top of the methanol water tower (02);
stopping a washing liquid delivery pump (61) of the tail gas washing tower (03) to the methanol water tower (02), and closing an inlet valve and an outlet valve of the washing liquid delivery pump (61);
stopping the feeding pump (51) of the methanol water tower, closing the inlet and outlet valves of the feeding pump (51) of the methanol water tower, and stopping feeding of the methanol water tower (02);
the valve on the reflux line (3) of the methanol water tower is closed and isolated.
3. The on-line boiling method of the methanol water tower in the low-temperature methanol water washing device according to claim 2, characterized in that after a valve on a methanol vapor heat-removal regeneration tower pipeline (1) at the top of the methanol water tower (02) is closed, a blind plate is added on the methanol water tower (02) side on the methanol vapor heat-removal regeneration tower pipeline (1) for isolation; after a valve of a return pipeline (3) of the methanol water tower is closed, a blind plate is added on the side of the methanol water tower (02) on the return pipeline (3) of the methanol water tower for isolation.
4. The on-line boiling method of the methanol water tower in the low-temperature methanol water washing device according to claim 1, wherein the desalted water is replaced by supplementing desalted water into the tower through a methanol water tower feed line (5) and a methanol water tower reflux line (3); the desalted water is pure water obtained after suspended matters, colloid and inorganic cations and anions are removed by a reverse osmosis or ion exchange resin process.
5. The on-line boiling method for the methanol water tower in the low-temperature methanol water washing device according to claim 1, wherein the alkali liquor is supplemented into the tower through a methanol water tower alkali liquor supplementing pipeline (4) connected to the methanol water tower.
6. The on-line boiling method for the methanol water tower in the low-temperature methanol water washing device as claimed in claim 1, wherein the boiling time is 24-30 hours.
7. The method for boiling the methanol water tower in the low-temperature methanol washing device in the online manner as claimed in claim 1, wherein 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 methanol tank of the methanol rectification device, and the discharge amount is controlled so as to ensure that the methanol water content in the thermal regeneration tower is qualified.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
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