CN210448129U - Online descaling methanol-water separation system in low-temperature methanol washing process - Google Patents
Online descaling methanol-water separation system in low-temperature methanol washing process Download PDFInfo
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- CN210448129U CN210448129U CN201921378848.2U CN201921378848U CN210448129U CN 210448129 U CN210448129 U CN 210448129U CN 201921378848 U CN201921378848 U CN 201921378848U CN 210448129 U CN210448129 U CN 210448129U
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- GBMDVOWEEQVZKZ-UHFFFAOYSA-N methanol;hydrate Chemical compound O.OC GBMDVOWEEQVZKZ-UHFFFAOYSA-N 0.000 title claims abstract description 117
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 title claims abstract description 105
- 238000000926 separation method Methods 0.000 title claims abstract description 84
- 238000005406 washing Methods 0.000 title claims abstract description 17
- 239000003513 alkali Substances 0.000 claims abstract description 79
- 239000002351 wastewater Substances 0.000 claims abstract description 65
- 239000007788 liquid Substances 0.000 claims abstract description 60
- 238000000034 method Methods 0.000 claims abstract description 37
- 238000005516 engineering process Methods 0.000 claims abstract description 9
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 37
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 35
- 230000001105 regulatory effect Effects 0.000 claims description 18
- 238000012546 transfer Methods 0.000 claims description 10
- 238000012545 processing Methods 0.000 abstract description 3
- HEMHJVSKTPXQMS-UHFFFAOYSA-M sodium hydroxide Inorganic materials [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 57
- 239000002994 raw material Substances 0.000 description 12
- 239000012535 impurity Substances 0.000 description 9
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 7
- 239000010883 coal ash Substances 0.000 description 6
- 239000000126 substance Substances 0.000 description 6
- 239000012530 fluid Substances 0.000 description 5
- 238000001816 cooling Methods 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 239000010865 sewage Substances 0.000 description 4
- 238000009834 vaporization Methods 0.000 description 4
- 230000008016 vaporization Effects 0.000 description 4
- 229910021529 ammonia Inorganic materials 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000012423 maintenance Methods 0.000 description 3
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- 238000004891 communication Methods 0.000 description 2
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- 230000007547 defect Effects 0.000 description 2
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- 238000012544 monitoring process Methods 0.000 description 2
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- 238000003786 synthesis reaction Methods 0.000 description 2
- 241000894006 Bacteria Species 0.000 description 1
- 230000001476 alcoholic effect Effects 0.000 description 1
- 150000008044 alkali metal hydroxides Chemical class 0.000 description 1
- 239000012670 alkaline solution Substances 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000006056 electrooxidation reaction Methods 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 239000010881 fly ash Substances 0.000 description 1
- JEGUKCSWCFPDGT-UHFFFAOYSA-N h2o hydrate Chemical compound O.O JEGUKCSWCFPDGT-UHFFFAOYSA-N 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
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- 231100000572 poisoning Toxicity 0.000 description 1
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- 231100000331 toxic Toxicity 0.000 description 1
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Abstract
The utility model provides an online scale removal methanol-water piece-rate system in low temperature methanol washing technology, include: a methanol-water separation tower; the liquid inlet of the reboiler is communicated with the methanol water liquid outlet of the methanol water separation tower; the liquid inlet of the heat exchanger is communicated with the wastewater liquid outlet of the methanol-water separation tower; the liquid outlet is communicated with a tube pass inlet pipeline of the reboiler; the online descaling unit comprises: a lye tank; and one end of the alkali liquor conveying pipeline is communicated with a liquid outlet of the alkali liquor tank, and the other end of the alkali liquor conveying pipeline is communicated with a tube pass inlet pipeline of the reboiler. The utility model provides an online scale removal methanol-water piece-rate system can realize methanol-water piece-rate system's online scale removal, and the scale removal in-process, the low-load operation of system need not the parking and overhauls the processing, and can dredge system fast, about twenty minutes can, does not influence system's normal operating.
Description
Technical Field
The utility model relates to a technical field is washed to low temperature methyl alcohol, in particular to online scale removal methanol-water piece-rate system in low temperature methyl alcohol washing technology.
Background
The low temperature methanol washing process is a material gas purifying method developed by Lurgi company and Linde company in 20 th century and 50 th era, and is widely applied in the synthesis of ammonia, methanol and Fischer-Tropsch synthesis industry with coal and residual oil as material. The working principle is as follows: cold methanol is used as solvent, and the solubility of various components in the process gas in the methanol is greatly different, for example, the components with the solubility from large to small are sequenced into H2O、HCN、NH3、H2S、COS、CO2、CH4、CO、N2、H2The difference of the solubility of the substances in the methanol is utilized to realize gas separation, so that qualified purified gas is obtained.
The low-temperature methanol process is provided with an ammonia washing tower, but because the temperature of washing water is 40 ℃, oil and coal ash in raw material gas cannot be washed, the raw material gas enters a raw material gas wound-tube heat exchanger for cooling after exiting the ammonia washing tower, a small amount of hot methanol is sprayed into the raw material gas before entering the wound-tube heat exchanger for preventing the raw material gas from being frozen to block a pipeline and the wound-tube heat exchanger, the raw material gas sprayed with the methanol enters a raw material gas separator after being cooled to about minus 20 ℃ through the wound-tube heat exchanger, methanol water in the raw material gas is separated, the methanol water is sent to a methanol-water separation system, the methanol is separated and recovered through distillation, and wastewater after the methanol is separated is sent.
However, as described above, the temperature of the raw material gas is reduced by the coiled heat exchanger before the raw material gas enters the raw material gas separator to separate the methanol water, and impurities such as oil stains and coal ash in the raw material gas are dissolved in the methanol water due to the temperature reduction, so the methanol water entering the methanol water separation system is the methanol water with the impurities such as oil stains and coal ash, and the methanol water treated by the methanol water separation system is the methanol water with the impurities.
The methanol water entering the methanol-water separation system from the upstream working section is the methanol water with impurities, and the impurities such as oily fly ash are enriched in the liquid phase of the methanol-water separation system, so that the tube bundle of a reboiler of the methanol-water separation tower is easily blocked, the heat exchange effect is influenced, the methanol evaporation amount is reduced, and the methanol in the finally discharged alcohol-containing wastewater exceeds the standard, so that the methanol loss is caused; simultaneously, impurity such as oily coal ash can't effectively filter under 140 ℃ high temperature, and impurity such as oily coal ash is analyzed out and is adhered to on the heat exchanger slab still can lead to the heat exchanger to block up in the alcohol-containing waste water cooling process, and the cooling effect variation leads to the outer alcoholic waste water temperature of sending higher, influences sewage treatment workshop section normal operating.
In the prior art, to solve the above problems, a general processing method is as follows: 1. stopping the methanol-water separation system, and removing the reboiler for mechanical cleaning or the heat exchanger for maintenance and cleaning; the method has the defects of labor consumption, long maintenance time, incapability of treating the alcohol-containing water in the period and influence on the treatment efficiency of the alcohol-containing water system; 2. directly supplying steam into the system to raise the temperature; the method has the defects that the problem of low temperature at the bottom of the methanol-water separation tower can be solved only in a short time, the blockage of the reboiler is more serious after the time is long, the electrochemical corrosion damage equipment is caused by long-time unclean pipe bundles, the steam directly enters a methanol-water separation system, the steam is wasted, and the treatment pressure of a downstream sewage treatment section is high. Therefore, the above solutions can not solve the problem of blockage in the methanol-water separation system.
SUMMERY OF THE UTILITY MODEL
In view of this, the utility model aims at providing an online scale removal methanol-water piece-rate system in low temperature methanol washing technology. The utility model provides an online scale removal device of methanol-water separation system can realize the online scale removal to methanol-water separation system, need not the clearance of stopping the car, can clear up the jam dirt on line, makes the unblocked operation of system, has reduced the complicated operation of the maintenance clearance of stopping the car and has improved system operation efficiency.
The utility model provides an online scale removal methanol-water piece-rate system in low temperature methanol washing technology, include:
a methanol-water separation tower;
the liquid inlet of the reboiler is communicated with the methanol water liquid outlet of the methanol water separation tower;
the liquid inlet of the heat exchanger is communicated with the wastewater liquid outlet of the methanol-water separation tower;
the liquid outlet is communicated with a tube pass inlet pipeline of the reboiler;
the online descaling unit comprises:
a lye tank;
and one end of the alkali liquor conveying pipeline is communicated with a liquid outlet of the alkali liquor tank, and the other end of the alkali liquor conveying pipeline is communicated with a tube pass inlet pipeline of the reboiler.
In one embodiment of the present invention, an electric stirrer is disposed in the lye tank; and an alkali adding port is formed in the top of the alkali liquor tank.
In one embodiment of the present invention, the alkali liquor conveying line is provided with a pneumatic diaphragm pump;
the alkali liquor conveying pipeline is divided into two sections by the pneumatic diaphragm pump, a pipeline from the alkali liquor tank to the pneumatic diaphragm pump is a first section of alkali liquor conveying pipeline, and a pipeline from the pneumatic diaphragm pump to a tube pass inlet of the reboiler is a second section of alkali liquor conveying pipeline;
an alkali liquor inlet valve is arranged on the first section alkali liquor conveying pipeline;
and a pneumatic diaphragm pump pressure gauge and an alkali liquor outlet valve are arranged on the second section alkali liquor conveying pipeline.
In an embodiment of the present invention, the pneumatic diaphragm pump is communicated with an air source pipeline; and the gas source pipeline is provided with a gas source valve.
In one embodiment of the present invention, the reboiler is a vertical thermosiphon reboiler.
In an embodiment of the present invention, the heat exchanger is a plate heat exchanger.
In one embodiment of the present invention, the plate heat exchanger is in communication with a waste water outlet line of the methanol-water separation tower and is also in communication with a liquid inlet line of alcohol-containing process water.
In an embodiment of the present invention, on the liquid inlet pipeline containing alcohol process water, the pipeline section before heat exchange is provided with a process water heat exchange front valve, and the pipeline section after heat exchange is provided with a process water heat exchange rear valve;
on the waste water drain line of methanol-water separation tower, the pipeline section is provided with valve before the waste water heat transfer before the heat transfer, and the pipeline section is provided with valve and waste water sampler behind the waste water heat transfer after the heat transfer.
The utility model discloses an in the embodiment, be provided with steam control valve on the steam admission pipeline of reboiler, and be located manometer behind the preceding manometer of steam control valve and the steam control valve around the steam control valve.
In one embodiment of the utility model, the device also comprises a direct-supplementing steam pipeline;
one end of the direct compensation steam pipeline is communicated with a steam inlet pipeline of the reboiler, and the other end of the direct compensation steam pipeline is communicated with a tube side outlet pipeline of the reboiler.
The utility model provides an online scale removal methanol-water piece-rate system in low temperature methanol washing technology, include: a methanol-water separation tower; the liquid inlet of the reboiler is communicated with the methanol water liquid outlet of the methanol water separation tower; the liquid inlet of the heat exchanger is communicated with the wastewater liquid outlet of the methanol-water separation tower; the liquid outlet is communicated with a tube pass inlet pipeline of the reboiler; the online descaling unit comprises: a lye tank; and one end of the alkali liquor conveying pipeline is communicated with a liquid outlet of the alkali liquor tank, and the other end of the alkali liquor conveying pipeline is communicated with a tube pass inlet pipeline of the reboiler. The utility model provides an online scale removal methanol-water piece-rate system can realize methanol-water piece-rate system's online scale removal, and the scale removal in-process, the low-load operation of system need not the parking and overhauls the processing, and can dredge system fast, about twenty minutes can, does not influence system's normal operating. Compare in the processing method of direct supplement steam and system parking machinery clearance, the utility model discloses a solve reboiler and heat exchanger jam problem when the system does not stop, after the system takes place to block up, can carry out the scale removal mediation at any time, do not influence the normal operating of system, improved system operating efficiency greatly.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a schematic structural diagram of an online descaling methanol-water separation system in a low-temperature methanol washing process according to an embodiment of the present invention;
fig. 2 is a schematic view of the connection between the reboiler and the methanol-water separation column according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
The utility model provides an online scale removal methanol-water piece-rate system in low temperature methanol washing technology, include:
a methanol-water separation tower;
the liquid inlet of the reboiler is communicated with the methanol water liquid outlet of the methanol water separation tower;
the liquid inlet of the heat exchanger is communicated with the wastewater liquid outlet of the methanol-water separation tower;
the liquid outlet is communicated with a tube pass inlet pipeline of the reboiler;
the online descaling unit comprises:
a lye tank;
and one end of the alkali liquor conveying pipeline is communicated with a liquid outlet of the alkali liquor tank, and the other end of the alkali liquor conveying pipeline is communicated with a tube pass inlet pipeline of the reboiler.
Referring to fig. 1, fig. 1 is a schematic structural diagram of an online descaling methanol-water separation system in a low-temperature methanol washing process according to an embodiment of the present invention; wherein, 1 is a methanol-water separation tower, 1-1 is a liquid inlet pipeline of alcohol-containing water process water, 1-1a is a process water heat exchange front valve 1-1a, 1-1b is a process water heat exchange rear valve, 1-2 is a wastewater liquid outlet pipeline, 1-2a is a wastewater heat exchange front valve, 1-2b is a wastewater heat exchange rear valve, 1-2c is a wastewater sampler, and 1-2d is an alcohol-containing wastewater differential pressure meter; 2 is a reboiler, 2-1 is a reboiler tube side inlet pipeline, 2-2 is a reboiler tube side outlet pipeline, 2-3 is a steam inlet pipeline, 2-4 is a steam condensate liquid drainage pipeline, and 2-5 is a direct steam supply pipeline; 3 is a heat exchanger; 4 is an online descaling unit, 5 is an alkali liquor tank, 6 is an electric stirrer, 8 is an alkali adding port, 8-1 is a desalted water conveying pipeline, 5-1 is an alkali liquor conveying pipeline, 9 is a pneumatic diaphragm pump, 5-1-1 is a first section alkali liquor conveying pipeline, 5-1-2 is a second section alkali liquor conveying pipeline, 5-1a is an alkali liquor inlet valve, 5-1b is a pneumatic diaphragm pump pressure gauge, 5-1c is an alkali liquor outlet valve, 9-1 is an air source pipeline, and 9a is an air source valve.
The utility model discloses in, methanol-water knockout tower 1 receives the alcohol-containing process water (the methanol-water that the preorder workshop section produced promptly) that comes from the production of upper reaches workshop section to carry out the distillation, make methanol and separation of water, and then make methanol obtain retrieving. The methanol-water separation tower 1 is communicated with a liquid inlet pipeline 1-1 containing alcohol process water.
The utility model discloses in, reboiler 2 receives the methanol-water that comes from 1 exhaust of methanol-water separation tower, to its intensification vaporization, and is specific, in the reboiler, heating medium (like steam) walks the shell side, and the tube side is walked to the process medium (being methanol-water), and the heating medium through in the shell side is to the methanol-water intensification vaporization in the tube side, lets in methanol-water separation tower 1 with the vaporization thing again, realizes the separation of the methyl alcohol of vaporization and liquid methanol-water in methanol-water separation tower 1. In the utility model, the liquid inlet of the reboiler 2 is communicated with the methanol-water liquid outlet of the methanol-water separation tower 1, and the communicating pipeline is the reboiler tube side inlet pipeline 2-1; meanwhile, the gas outlet of the reboiler is communicated with the gas inlet of the methanol-water separation tower 1, and the communicating pipeline is a reboiler tube pass outlet pipeline 2-2. Namely, alcohol-containing process water enters a methanol-water separation tower 1 through a liquid inlet pipeline 1-1, is discharged from the bottom of the methanol-water separation tower 1, enters a reboiler 2 through a reboiler tube side inlet pipeline 2-1, is heated and vaporized through the reboiler 2, and enters the methanol-water separation tower 1 through a reboiler tube side outlet pipeline 2-2 to realize the separation of vaporized methanol and liquid methanol-water.
In the preferred embodiment of the present invention, the reboiler 2 is a vertical thermosiphon reboiler. Referring to fig. 2, fig. 2 is a schematic view illustrating a connection between a reboiler and a methanol-water separation column according to an embodiment of the present invention; in the reboiler, the heating medium passes through the shell pass, the process medium passes through the tube pass and is vaporized in the tube, the process medium belongs to unit operation of natural circulation, and the density difference of the fluid is circulating power, so that the process medium always flows from the methanol-water separation tower 1 to the reboiler 2. The methanol water in the methanol-water separation tower 1 is introduced into a reboiler 2 from the bottom of the tower, after the temperature is raised and the vapor is vaporized by the reboiler 2, the vapor enters the methanol-water separation tower 1 from a reboiler tube side outlet pipeline 2-2 to realize the separation of the vaporized methanol and the liquid methanol water, and the generated alcohol-containing wastewater is discharged from the bottom of the methanol-water separation tower 1 and is discharged after heat exchange.
In one embodiment of the present invention, the reboiler 2 is used for steam stripping heat supply, that is, receiving steam from an external steam supply device (not shown in the figure) as a heating medium; a steam inlet pipeline 2-3 is communicated between the reboiler 2 and an external steam supply device. In some embodiments of the present invention, a steam regulating valve 2a is disposed on the steam inlet pipeline 2-3, and a front pressure gauge 2b and a rear pressure gauge 2c are disposed around the steam regulating valve 2 a. The utility model discloses in, reboiler 2 still communicates steam condensate flowing back pipeline 2-4, and steam condensate discharges through this pipeline.
In some embodiments of the utility model, a direct-supplementing steam pipeline 2-5 is also arranged; one end of the direct steam supply pipeline 2-5 is communicated with a steam inlet pipeline 2-3 of the reboiler 2, and the other end is communicated with a tube side outlet pipeline 2-2 of the reboiler 2.
The utility model discloses in, heat exchanger 3 is linked together with methanol-water separation tower 1's waste water liquid outlet, and methanol-water separation tower 1 exhaust alcohol-containing waste water is arranged outside behind the 3 heat transfer of heat exchanger. Methanol content is less than 800ppm in the produced alcohol-containing waste water that contains in the methyl alcohol separation, and this part waste water can't be handled in the low temperature methyl alcohol washing technology, need cool down to 36 ℃ after arrange outward to sewage treatment plant handle, the utility model discloses in, utilize heat exchanger 3 to arrange outward again after cooling to alcohol-containing waste water. If the heat exchanger 3 is blocked, a bypass valve (not shown in the figure) of the heat exchanger 3 needs to be opened, the temperature of the alcohol-containing wastewater can reach 140 ℃, the operation of a subsequent sewage treatment device is influenced, the high temperature is expressed by that bacteria are killed, toxic and harmful substances are analyzed from the wastewater, the environment is polluted, and inspection and operator poisoning are caused.
In an embodiment of the present invention, the heat exchanger 3 is a plate heat exchanger. The plate heat exchanger is heat exchange equipment which is formed by welding or pressing a plurality of layers of corrugated heat transfer plates at certain intervals; thin rectangular channels are formed between various plates, heat exchange is carried out through the plates, and fluid distribution pipes and fluid collection pipes are formed at the four corners of the plates and the gaskets, so that cold and hot fluids are reasonably separated, and heat exchange is carried out through the plates.
In one embodiment of the present invention, the plate heat exchanger is communicated with a waste water outlet pipeline 1-2 of the methanol-water separation tower 1, and is simultaneously communicated with a liquid inlet pipeline 1-1 of alcohol-containing process water, see fig. 1; the waste water discharged from the alcohol-containing process water and methanol water separation tower is used as two alternate cold and hot fluid media of the plate heat exchanger, and heat exchange is carried out through the plate heat exchanger.
In an embodiment of the present invention, on the liquid inlet pipeline 1-1 containing alcohol process water, the pipeline section before heat exchange is provided with a process water heat exchange front valve 1-1a, and the pipeline section after heat exchange is provided with a process water heat exchange rear valve 1-1b, see fig. 1. The delivery of alcohol-containing process water can be controlled to be stopped and the flow rate can be controlled by two regulating valves 1-1a and 1-1 b.
In an embodiment of the present invention, on the waste water outlet pipeline 1-2 of the methanol-water separation tower 1, the pipeline section before heat exchange is provided with the waste water heat exchange front valve 1-2a, and the pipeline section after heat exchange is provided with the waste water heat exchange rear valve 1-2b and the waste water sampler 1-2c, see fig. 1. The two regulating valves 1-2a and 1-2b can control the transportation stop and the flow of the alcohol-containing wastewater discharged from the methanol-water separation tower 1. The wastewater sampler 1-2c can be used for sampling on line, so that the wastewater can be monitored in real time conveniently.
In an embodiment of the present invention, an alcohol-containing wastewater differential pressure gauge 1-2d is disposed on the wastewater outlet line 1-2 of the methanol-water separation tower 1, see fig. 1, and the alcohol-containing wastewater differential pressure gauge 1-2d is connected to the wastewater outlet line 1-2 across the heat exchanger 3 for monitoring the pressure difference between the two sections of alcohol-containing wastewater before and after heat exchange.
In the utility model, the liquid outlet of the online descaling unit 4 is communicated with the reboiler tube side inlet pipeline 2-1. The online descaling unit 4 comprises: a lye tank 5; and an alkali liquor conveying pipeline 5-1, one end of which is communicated with the liquid outlet of the alkali liquor tank 5, and the other end of which is communicated with the tube side inlet pipeline 2-1 of the reboiler. Through the research discovery of the applicant, the waste water pH value at the bottom of methanol-water separation tower 1 shows acidity, and water quality contains impurity such as greasy dirt coal ash, and the accessible adds alkali, solves reboiler tube bank jam problem, the utility model discloses in, set up online scale removal unit, alkali lye tank 5 wherein provides alkali lye, carries alkali lye through alkali lye pipeline 5-1 in to reboiler 2, dissolves impurity, mediation reboiler 2.
In one embodiment of the present invention, an electric stirrer 6 is disposed in the lye tank 5, and the liquid in the lye tank 5 is stirred by the electric stirrer 6. The connection relationship between the electric stirrer 6 and the lye tank 5 is not particularly limited, and the electric stirrer can be connected with the stirrer according to the connection mode of a common tank body, for example, the rotating shaft of the electric stirrer 6 is connected with the top plate of the lye tank 5, and the stirring head extends into the lye tank 5.
In an embodiment of the present invention, the top of the lye tank 5 is provided with an alkali adding port 8, see fig. 1, through which the alkali adding port 8 adds alkaline substances into the lye tank. In the present invention, the alkaline substance is an alkali metal hydroxide; in one embodiment, sodium hydroxide. In an embodiment of the present invention, the lye tank 5 is further communicated with a desalted water conveying pipeline 8-1, see fig. 1, desalted water is added into the lye tank 5 in advance through the desalted water conveying pipeline 8-1, alkaline substances are added through the lye adding port 8, and the materials in the lye tank 5 are mixed uniformly through the electric stirrer 6 to prepare lye with a certain pH value. The liquid level of the desalted water is determined according to the alkali adding amount and the final required concentration. In the preferred embodiment of the present invention, the pH of the alkaline solution is 10-11.
In one embodiment of the present invention, the alkali liquor conveying pipeline 5-1 is provided with a pneumatic diaphragm pump 9; the alkali liquor conveying pipeline 5-1 is divided into two sections by the pneumatic diaphragm pump 9, the pipeline from the alkali liquor tank 5 to the pneumatic diaphragm pump 9 is a first section of alkali liquor conveying pipeline 5-1-1, and the pipeline from the pneumatic diaphragm pump 9 to the reboiler tube pass inlet pipeline 2-1 is a second section of alkali liquor conveying pipeline 5-1-2; see fig. 1. Wherein, an alkali liquor inlet valve 5-1a is arranged on the first section of alkali liquor conveying pipeline 5-1-1; and a pneumatic diaphragm pump pressure gauge 5-1b and an alkali liquor outlet valve 5-1c are arranged on the second section of alkali liquor conveying pipeline 5-1-2. In one embodiment, the pneumatic diaphragm pump pressure gauge 5-1b is arranged between the lye outlet valve 5-1c and the pneumatic diaphragm pump 9.
In one embodiment of the present invention, the pneumatic diaphragm pump 9 is connected to an air source pipeline 9-1; an air source valve 9a is arranged on the air source pipeline 9-1; see fig. 1.
The blockage of the reboiler 2 is shown in that the pressure of a pressure gauge 2c behind the steam regulating valve rises until the pressure is the same as that of a pressure gauge 2b in front of the steam regulating valve, the valve position of the steam regulating valve 2a is increased, the temperature of the bottom of the methanol-water separation tower 1 is reduced, and the content of methanol in the discharged wastewater is increased; the pressure difference of the heat exchanger 3 is increased and the amount of the delivered water is reduced. Utilize the utility model provides an above-mentioned online scale removal methanol-water separation system when carrying out online scale removal can go on according to following step:
s1, adding desalted water into the lye tank 5, adding alkaline substances through the lye adding port 8, and uniformly mixing the materials in the lye tank 5 through the electric stirrer 6 to prepare lye with a certain pH value.
S2, reducing the inflow of alcohol-containing process water and the outflow of alcohol-containing wastewater, and increasing the liquid level of the methanol-water separation tower 1 to make the liquid level reach the tube bundle position of the tube pass outlet of the reboiler 2, so as to ensure that the tube bundle can be fully soaked by alkali liquor in the subsequent procedures.
S3, opening an alkali liquor inlet valve 5-1a of the pneumatic diaphragm pump 9, slowly starting an air source valve 9a of the pneumatic diaphragm pump 9, monitoring pressure through a pneumatic diaphragm pump pressure gauge 5-1b, opening an alkali liquor outlet valve 5-1c of the pneumatic diaphragm pump 9 when the outlet pressure of the pneumatic diaphragm pump 9 reaches the pressure of the methanol-water separation system, and introducing alkali liquor into a tube pass inlet pipeline of the reboiler.
S4, extracting the alcohol-containing wastewater on site through the wastewater sampler 1-2c, detecting the pH value of the alcohol-containing wastewater, and stopping adding the alkali into the alkali liquor tank when the pH value reaches 9-10.
S5, observing the valve position and pressure of a steam regulating valve of the reboiler 2, and when the valve position of the steam regulating valve in the reboiler 2 is gradually reduced and the pressure of a pressure gauge 2c behind the steam regulating valve is gradually reduced, indicating that the reboiler 2 is slowly dredged; when the pressure of the pressure gauge 2c behind the steam adjusting valve reaches the design value, opening a waste water heat exchange front valve 1-2a of the large alcohol-containing waste water, and reducing the liquid level of the methanol-water separation tower 1 to the minimum to carry away dirt dissolved in alkali liquor.
S6, observing that the pressure difference meter for the alcohol-containing wastewater is 1-2d, the pressure difference of the alcohol-containing wastewater on the two sides of the heat exchanger 3 is reduced and is restored to a normal value, and proving that the dredging effect is achieved.
The index of the descaling completion is that the pressure of the pressure gauge 2c behind the steam regulating valve is reduced to a normal operation index, the valve position of the steam regulating valve 2a is reduced to an operation valve position, and the pressure difference of the heat exchanger 3 is reduced to below 50 KPa. And after the indexes reach, suspending the online descaling device, closing the alkali liquor outlet valve 5-1c, stopping conveying the alkali liquor, recovering the input amount of the alcohol-containing process water and the output amount of the alcohol-containing wastewater, and normally operating the methanol-water separation system. The actual treatment usually achieves the unblocking of the reboiler 1 and the heat exchanger 3 about 20 minutes after the addition of the alkali.
In the online descaling process, the alcohol-containing wastewater flows through the plate heat exchanger 3, and the plate heat exchanger 3 can be dredged while the reboiler 1 is dredged. In addition, if only the plate heat exchanger 3 is blocked, the descaling operation is carried out according to the above operation, when the pH value of the wastewater taken out from the wastewater sampler 1-2c meets the requirement, the valve 1-2b after wastewater heat exchange is closed, the plate heat exchanger 3 is soaked, the valve 1-2b after wastewater heat exchange is opened after the wastewater heat exchange is about 20 minutes, and the pressure difference meter 1-2d of the wastewater containing alcohol shows that the pressure difference is reduced to be below 50KPa, which indicates that the heat exchanger 3 is dredged and returns to normal operation.
The utility model provides an online scale removal methanol-water piece-rate system in low temperature methanol washing technology, include: a methanol-water separation tower; the liquid inlet of the reboiler is communicated with the methanol water liquid outlet of the methanol water separation tower; the liquid inlet of the heat exchanger is communicated with the wastewater liquid outlet of the methanol-water separation tower; the liquid outlet is communicated with a tube pass inlet pipeline of the reboiler; the online descaling unit comprises: a lye tank; and one end of the alkali liquor conveying pipeline is communicated with a liquid outlet of the alkali liquor tank, and the other end of the alkali liquor conveying pipeline is communicated with a tube pass inlet pipeline of the reboiler. The utility model provides an online scale removal methanol-water piece-rate system can realize methanol-water piece-rate system's online scale removal, and the scale removal in-process, the low-load operation of system need not the parking and overhauls the processing, and can dredge system fast, about twenty minutes can, does not influence system's normal operating. Compare in the processing method of direct supplement steam and system parking machinery clearance, the utility model discloses a solve reboiler and heat exchanger jam problem when the system does not stop, after the system takes place to block up, can carry out the scale removal mediation at any time, do not influence the normal operating of system, improved system operating efficiency greatly. Moreover, the utility model discloses the alkali position that adds that selects to online descaling unit is best, leads at the tube side entry pipeline low point of reboiler and drenches the increase and add alkali descaling unit, and the flow is shortest, and the alkali consumption is minimum.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (10)
1. An online scale removal methanol-water separation system in low temperature methanol washing technology, which is characterized by comprising:
a methanol-water separation tower;
the liquid inlet of the reboiler is communicated with the methanol water liquid outlet of the methanol water separation tower;
the liquid inlet of the heat exchanger is communicated with the wastewater liquid outlet of the methanol-water separation tower;
the liquid outlet is communicated with a tube pass inlet pipeline of the reboiler;
the online descaling unit comprises:
a lye tank;
and one end of the alkali liquor conveying pipeline is communicated with a liquid outlet of the alkali liquor tank, and the other end of the alkali liquor conveying pipeline is communicated with a tube pass inlet pipeline of the reboiler.
2. The on-line descaling methanol-water separation system of claim 1,
an electric stirrer is arranged in the lye tank;
and an alkali adding port is formed in the top of the alkali liquor tank.
3. The on-line descaling methanol-water separation system according to claim 1 or 2, wherein a pneumatic diaphragm pump is arranged on the alkali liquor conveying line;
the alkali liquor conveying pipeline is divided into two sections by the pneumatic diaphragm pump, a pipeline from the alkali liquor tank to the pneumatic diaphragm pump is a first section of alkali liquor conveying pipeline, and a pipeline from the pneumatic diaphragm pump to a tube pass inlet of the reboiler is a second section of alkali liquor conveying pipeline;
an alkali liquor inlet valve is arranged on the first section alkali liquor conveying pipeline;
and a pneumatic diaphragm pump pressure gauge and an alkali liquor outlet valve are arranged on the second section alkali liquor conveying pipeline.
4. The on-line descaling methanol-water separation system according to claim 3, wherein the pneumatic diaphragm pump is communicated with a gas source pipeline;
and the gas source pipeline is provided with a gas source valve.
5. The on-line descaling methanol-water separation system of claim 1, wherein the reboiler is a vertical thermosiphon reboiler.
6. The on-line descaling methanol-water separation system according to claim 1, wherein the heat exchanger is a plate heat exchanger.
7. The on-line descaling methanol-water separation system of claim 6, wherein the plate heat exchanger is communicated with a waste water outlet pipeline of the methanol-water separation tower and is simultaneously communicated with a liquid inlet pipeline of alcohol-containing process water.
8. The on-line descaling methanol-water separation system of claim 7, wherein on the alcohol-containing process water liquid inlet pipeline, the pipeline section before heat exchange is provided with a process water heat exchange front valve, and the pipeline section after heat exchange is provided with a process water heat exchange rear valve;
on the waste water drain line of methanol-water separation tower, the pipeline section is provided with valve before the waste water heat transfer before the heat transfer, and the pipeline section is provided with valve and waste water sampler behind the waste water heat transfer after the heat transfer.
9. The on-line descaling methanol-water separation system according to claim 1, wherein a steam regulating valve, a pressure gauge before the steam regulating valve and a pressure gauge after the steam regulating valve are arranged on a steam inlet line of the reboiler, and the pressure gauge before the steam regulating valve and the pressure gauge after the steam regulating valve are arranged in front of and behind the steam regulating valve.
10. The on-line descaling methanol-water separation system of claim 1 or 9, further comprising a direct steam supply line;
one end of the direct compensation steam pipeline is communicated with a steam inlet pipeline of the reboiler, and the other end of the direct compensation steam pipeline is communicated with a tube side outlet pipeline of the reboiler.
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| CN201921378848.2U CN210448129U (en) | 2019-08-23 | 2019-08-23 | Online descaling methanol-water separation system in low-temperature methanol washing process |
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| CN201921378848.2U CN210448129U (en) | 2019-08-23 | 2019-08-23 | Online descaling methanol-water separation system in low-temperature methanol washing process |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114432846A (en) * | 2022-01-04 | 2022-05-06 | 中国神华煤制油化工有限公司 | Drainage device and low-temperature methanol washing equipment |
| CN114769245A (en) * | 2022-04-25 | 2022-07-22 | 河南开祥精细化工有限公司 | Float valve tower cleaning system and cleaning method |
-
2019
- 2019-08-23 CN CN201921378848.2U patent/CN210448129U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114432846A (en) * | 2022-01-04 | 2022-05-06 | 中国神华煤制油化工有限公司 | Drainage device and low-temperature methanol washing equipment |
| CN114769245A (en) * | 2022-04-25 | 2022-07-22 | 河南开祥精细化工有限公司 | Float valve tower cleaning system and cleaning method |
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