CN111285421A - Methanol-to-olefin sewage stripping tower system - Google Patents
Methanol-to-olefin sewage stripping tower system Download PDFInfo
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- CN111285421A CN111285421A CN202010047942.0A CN202010047942A CN111285421A CN 111285421 A CN111285421 A CN 111285421A CN 202010047942 A CN202010047942 A CN 202010047942A CN 111285421 A CN111285421 A CN 111285421A
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- reboiler
- vertical
- stripping tower
- sieve plate
- sewage
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- 239000010865 sewage Substances 0.000 title claims abstract description 79
- 239000002351 wastewater Substances 0.000 claims abstract description 31
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 16
- 239000007788 liquid Substances 0.000 claims abstract description 10
- 238000007599 discharging Methods 0.000 claims abstract description 5
- 230000005540 biological transmission Effects 0.000 claims description 3
- 229920006395 saturated elastomer Polymers 0.000 claims description 3
- 239000002699 waste material Substances 0.000 claims description 3
- 239000008187 granular material Substances 0.000 abstract description 4
- 239000000463 material Substances 0.000 abstract description 4
- 239000007787 solid Substances 0.000 abstract description 3
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 12
- 239000007789 gas Substances 0.000 description 5
- 238000005406 washing Methods 0.000 description 5
- LCGLNKUTAGEVQW-UHFFFAOYSA-N Dimethyl ether Chemical compound COC LCGLNKUTAGEVQW-UHFFFAOYSA-N 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 4
- 239000003054 catalyst Substances 0.000 description 3
- 238000004140 cleaning Methods 0.000 description 3
- 238000010791 quenching Methods 0.000 description 3
- 230000008929 regeneration Effects 0.000 description 3
- 238000011069 regeneration method Methods 0.000 description 3
- NNJPGOLRFBJNIW-HNNXBMFYSA-N (-)-demecolcine Chemical compound C1=C(OC)C(=O)C=C2[C@@H](NC)CCC3=CC(OC)=C(OC)C(OC)=C3C2=C1 NNJPGOLRFBJNIW-HNNXBMFYSA-N 0.000 description 2
- 150000001336 alkenes Chemical class 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- JRZJOMJEPLMPRA-UHFFFAOYSA-N olefin Natural products CCCCCCCC=C JRZJOMJEPLMPRA-UHFFFAOYSA-N 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 239000012071 phase Substances 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 230000000171 quenching effect Effects 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000012159 carrier gas Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000005192 partition Methods 0.000 description 1
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/34—Nature of the water, waste water, sewage or sludge to be treated from industrial activities not provided for in groups C02F2103/12 - C02F2103/32
- C02F2103/36—Nature of the water, waste water, sewage or sludge to be treated from industrial activities not provided for in groups C02F2103/12 - C02F2103/32 from the manufacture of organic compounds
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- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
The invention discloses a methanol-to-olefin sewage stripping tower system which comprises a sieve plate type sewage stripping tower, a first vertical thermosyphon reboiler, a second vertical thermosyphon reboiler and a sewage stripping water pump, wherein gas conveying pipes are respectively arranged between outlets at the tops of the first vertical thermosyphon reboiler and the second vertical thermosyphon reboiler and a kettle of the sieve plate type sewage stripping tower, steam inlet parts of the first vertical thermosyphon reboiler and the second vertical thermosyphon reboiler are respectively connected with a steam feeding pipe, liquid outlet parts of the first vertical thermosyphon reboiler and the second vertical thermosyphon reboiler are respectively connected with a condensate discharging pipe, and a stripping waste water pipe is connected between the bottom of the sieve plate type sewage stripping tower and an inlet of the sewage stripping water pump. According to the sieve plate type sewage stripping tower, materials containing solids and high-viscosity materials can be more conveniently treated, the sieve plate type sewage stripping tower is more suitable for treating granular materials, and feeding of the sieve plate type sewage stripping tower is more diversified.
Description
Technical Field
The invention relates to the technical field of chemical industry, in particular to a methanol-to-olefin sewage stripping tower system.
Background
The process for preparing olefin from methanol by using a fluidized bed mainly comprises a reaction regeneration device and a compression separation device, in the industrial device for preparing olefin from methanol, which is mature and applied at present, the treatment flow of stripping sewage comprises the steps that sewage from a quench tower and a washing tower enters a sewage settling tank (used for feeding of a sewage stripping tower), the sewage settled by the settling tank is boosted by a feeding pump of the stripping tower, and then enters a middle-upper tray of the sewage stripping tower after heat exchange by a feeding heat exchanger of the stripping tower, the sewage stripping tower adopts a float valve tray, two kettle type stripping tower bottom reboilers are arranged at the bottom of the sewage stripping tower, the low-pressure superheated steam at 280 ℃ and 1.0MpaG is adopted as a heat source by the bottom reboiler at the bottom of the sewage stripping. The sewage in the methanol-to-olefin sewage stripping tower contains a small amount of catalyst particles wrapped by oil, can not be effectively removed under the action of stripping, is easy to enrich at the bottom of the tower, circulates between the bottom of the tower and a reboiler for a long time, scales are formed on the inner wall of a shell pass and the outer wall of a U-shaped pipe in different degrees after the device operates for a period of time, and when the heat exchange efficiency is too low to maintain production, the device must be isolated and stopped, and is cleaned after core pulling. However, the mixture containing the catalyst and the oil adheres to the surface of the U-shaped pipe for a long time, the tightness of the combination with the U-shaped pipe is very high, even if the U-shaped pipe is cleaned by a high-pressure water gun, dirt on the surface of the middle part of the U-shaped pipe bundle is difficult to clean thoroughly, the physical cleaning effect is poor, chemical cleaning is needed in severe cases, maintenance operation comprises high-risk special operations such as high-altitude operation and fire operation, and the safety risk is high.
The existing stripping system for methanol-to-olefin sewage mostly adopts a float valve tower plate, the valve plate is easy to fall off or block when granular materials are treated, and in addition, the shell side of the kettle-type reboiler is blocked and inconvenient to clean.
Disclosure of Invention
Based on the technical problems in the background art, the invention provides a methanol-to-olefin wastewater stripping tower system.
The invention provides a methanol-to-olefin sewage stripping tower system which comprises a sieve plate type sewage stripping tower, a first vertical thermosyphon reboiler, a second vertical thermosyphon reboiler and a sewage stripping water pump, wherein gas conveying pipes are respectively arranged between outlets at the tops of the first vertical thermosyphon reboiler and the second vertical thermosyphon reboiler and a kettle of the sieve plate type sewage stripping tower, steam inlet parts of the first vertical thermosyphon reboiler and the second vertical thermosyphon reboiler are respectively connected with a steam feeding pipe, liquid outlet parts of the first vertical thermosyphon reboiler and the second vertical thermosyphon reboiler are respectively connected with a condensate discharging pipe, a stripping waste water pipe is connected between the bottom of the sieve plate type sewage stripping tower and an inlet of the sewage stripping water pump of the reboiler, branch pipes are respectively connected between a sewage inlet part of the first vertical thermosyphon reboiler and a sewage inlet part of the second vertical thermosyphon reboiler and the stripping waste water pipe, and a sewage pipe is connected at the outlet of the sewage stripping water pump.
Preferably, 40 layers of sieve plate tower plates are arranged inside the sieve plate type sewage stripping tower, a large-pore sieve plate is adopted as a tower tray of the sieve plate type sewage stripping tower, the inner diameter of the tower is 2600mm, the height of the tower is 41560mm, the distance between the plates is 500mm, and the operation elasticity is 2.6.
Preferably, the first vertical thermosyphon reboiler and the second vertical thermosyphon reboiler are both fixed tube and plate heat exchangers.
Preferably, the pressure of the first vertical type thermosyphon reboiler and the pressure of the second vertical type thermosyphon reboiler are both 0.44MPaG, and the heat transfer area of the first vertical type thermosyphon reboiler and the heat transfer area of the second vertical type thermosyphon reboiler are both 1182 square meters.
Preferably, the shell-side media of the first vertical thermosyphon reboiler and the second vertical thermosyphon reboiler are 1.0MPaG saturated steam at 184 ℃, and the tube-side media of the first vertical thermosyphon reboiler and the second vertical thermosyphon reboiler are stripping wastewater at 154 ℃.
Preferably, two steam feed pipes are provided with a cut-off valve in a butt-clamping manner.
The beneficial effects of the invention are as follows:
1. through the sieve plate type sewage stripping tower that sets up, more conveniently handle the material that contains solid and high viscous nature, more be suitable for and handle granular material, can improve gas-liquid phase flux, improve column plate efficiency, improve operation elasticity, when handling and containing granular material, the valve block is difficult for droing or the card dies, simple structure, and the washing is easily dismantled to the column tray.
2. The sewage from other devices is added, so that the feeding of the sieve plate type sewage stripping tower is more diversified, and the treatment capacity is larger.
3. Through the sieve plate type sewage stripping tower and the double-vertical thermosiphon reboiler which are arranged, the treatment of materials containing solids and high viscosity is more effective, clean steam in the vertical thermosiphon reboiler is changed into a shell pass, sewage is changed into a tube pass, the maintenance and cleaning work of the vertical thermosiphon reboiler is more convenient, the process requirements are met, organic matters in the sewage can be fully stripped and recovered, and the burden of a three-waste treatment device is lightened.
Drawings
FIG. 1 is a schematic structural diagram of a stripping tower system for methanol-to-olefin wastewater provided by the invention.
In the figure: 1 sieve plate type sewage stripping tower, 2 first vertical thermosyphon reboiler, 3 second vertical thermosyphon reboiler, 4 sewage stripping water pump, 5 condensate discharging pipe, 6 branch pipes, 7 stripping waste water pipe, 8 sewage pipe, 9 gas transmission pipe, 10 valve, 11 steam feeding pipe.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
Referring to fig. 1, a methanol-to-olefin wastewater stripping tower system comprises a sieve plate type wastewater stripping tower 1, a first vertical thermosyphon reboiler 2, a second vertical thermosyphon reboiler 3 and a wastewater stripping water pump 4, wherein gas transmission pipes 9 are respectively arranged between outlets at the tops of the first vertical thermosyphon reboiler 2 and the second vertical thermosyphon reboiler 3 and a tower kettle of the sieve plate type wastewater stripping tower 1, steam inlet parts of the first vertical thermosyphon reboiler 2 and the second vertical thermosyphon reboiler 3 are respectively connected with a steam inlet pipe 11, liquid outlet parts of the first vertical thermosyphon reboiler 2 and the second vertical thermosyphon reboiler 3 are respectively connected with a condensate discharging pipe 5, a stripping wastewater pipe 7 is connected between the bottom of the sieve plate type wastewater stripping tower 1 and an inlet of the wastewater stripping water pump 4, and a branch pipe 6 is respectively connected between a wastewater inlet part of the first vertical thermosyphon reboiler 2 and the second vertical thermosyphon reboiler 3 and the stripping wastewater pipe 7, the outlet of the sewage stripping water pump 4 is connected with a sewage pipe 8.
In the invention, 40 layers of sieve plate tower plates are arranged in the sieve plate type sewage stripping tower 1, a tower tray form of the sieve plate type sewage stripping tower 1 adopts a large-pore sieve plate, the inner diameter of the tower is 2600mm, the height of the tower is 41560mm, the plate spacing is 500mm, the operation flexibility is 2.6, a treatment medium is wastewater containing catalyst particles and organic matters such as methanol and dimethyl ether, the first vertical thermosiphon reboiler 2 and the second vertical thermosiphon reboiler 3 are BEM type, namely a fixed tube plate type heat exchanger, the pressure of the first vertical thermosiphon reboiler 2 and the pressure of the second vertical thermosiphon reboiler 3 are both 0.44MPaG, the heat transfer area of the first vertical thermosiphon reboiler 2 and the heat transfer area of the second vertical thermosiphon reboiler 3 are both 1182 square meters, the shell pass mediums of the first vertical thermosiphon reboiler 2 and the second vertical thermosiphon reboiler 3 are both 1.0MPaG saturated steam at 184 ℃, and the tube pass of the first vertical thermosiphon reboiler 2 and the second vertical thermosiphon reboiler 3 are both 154 ℃ square steam at 154 DEG The load of the stripping waste water can be flexibly adjusted by increasing or reducing the amount of heating steam D or M so as to meet the stripping requirement of organic matters in the waste water when the sieve plate type sewage stripping tower 1 is in different working conditions, and the two steam feeding pipes 11 are provided with the stop valves 10 in a butt-clamping manner.
Quenching water B from a quenching tower of a reaction regeneration device, washing water C from a washing tower of the reaction regeneration device and waste water A from a washing tower of a compression separation device are converged into one strand, the strand enters from the upper part of a sieve plate type sewage stripping tower 1, steam stripped after being heated by a first thermosiphon reboiler 2 and a second vertical thermosiphon reboiler 3 from top to bottom carries out heat convection on 40 layers of sieve plate trays in the sieve plate type sewage stripping tower 1, methanol and dimethyl ether in the A are evaporated and then mixed with the steam stripped to generate a gas phase substance F, the gas phase substance F is directly sent to a feeding pipeline of a reactor system to continuously participate in a methanol-to-olefin reaction, the sewage G with the qualified discharge quality after steam stripping is sent out from the bottom of the sieve plate type sewage stripping tower 1 through a steam stripping waste water pipe 7, and one part of the sewage G is sent to the first thermosiphon reboiler 2 and the second vertical thermosiphon reboiler through a branch pipe 6 and is sent to the 1.0MP, The heated steam with the temperature of 184 ℃ is used as stripping carrier gas, namely stripping steam, to continue circulation, and the other part is sent to a three-waste treatment device from a sewage pipe 8 through a sewage stripping water pump 4. The tube passes of the first vertical thermosiphon reboiler 2 and the second vertical thermosiphon reboiler 3 are both stripping waste water at 154 ℃, the shell passes are both heating steam, hot medium steam and cold medium sewage exchange heat with the convection partition wall in the first vertical thermosiphon reboiler 2 and the second vertical thermosiphon reboiler 3, when the sewage in the tube passes of the first vertical thermosiphon reboiler 2 and the second vertical thermosiphon reboiler 3 is heated, the sewage is changed into a steam-liquid mixture, the density of the sewage is reduced, the sewage enters the tower kettle of the sieve plate type sewage stripping tower 1 from the upper parts of the first vertical thermosiphon reboiler 2 and the second vertical thermosiphon reboiler 3, the liquid at the bottom of the tower kettle of the sieve plate type sewage stripping tower 1 automatically flows to the bottoms of the first vertical thermosiphon reboiler 2 and the second vertical thermosiphon reboiler 3 due to high density, a driving pressure head of flow circulation is provided by the liquid level of a liquid pool in the sieve plate type sewage stripping tower 1, the liquid level in the sieve plate type sewage stripping tower 1 and the upper tube plates of the first vertical thermosiphon reboiler 2 and the second vertical thermosiphon reboiler 3 are on the same horizontal plane, a natural circulation is formed from the bottom of the tower kettle of the sieve plate type sewage stripping tower 1, the first vertical thermosiphon reboiler 2 and the second vertical thermosiphon reboiler 3, the top of the tower kettle of the sieve plate type sewage stripping tower 1 and the sieve plate type sewage stripping tower 1, the liquid in the kettle of the sieve plate type sewage stripping tower 1 is continuously heated, the heat supply in the first vertical thermosiphon reboiler 2 and the second vertical thermosiphon reboiler 3 is changed according to the heating steam quantity D or M, the heating steam quantity D or M is increased and the condensate discharge quantity E or N is increased, the heat exchange area is increased, the heat supply is increased, vice versa, the circulation speed is high, the heat transfer film coefficient is higher than that of a horizontal type, and a good anti-scaling effect is achieved, through the trip valve 10 that is equipped with in the exit of first vertical thermosyphon reboiler 2 and the vertical thermosyphon reboiler 3 of second, increase when the tube side scale deposit and influence heat exchange efficiency, when needing to clear up, can increase another reboiler load, keep apart the reboiler of scale deposit, use the high-pressure squirt to wash the tube side from the top down.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (6)
1. A methanol-to-olefin sewage stripping tower system comprises a sieve plate type sewage stripping tower (1), a first vertical siphon reboiler (2), a second vertical siphon reboiler (3) and a sewage stripping water pump (4), and is characterized in that gas transmission pipes (9) are arranged between the top outlets of the first vertical siphon reboiler (2) and the second vertical siphon reboiler (3) and the tower kettle of the sieve plate type sewage stripping tower (1), steam inlet parts of the first vertical siphon reboiler (2) and the second vertical siphon reboiler (3) are connected with a steam inlet pipe (11), liquid outlet parts of the first vertical siphon reboiler (2) and the second vertical siphon reboiler (3) are connected with a condensate discharging pipe (5), and a stripping waste water pipe (7) is connected between the bottom of the sieve plate type sewage stripping tower (1) and the inlet part of the sewage stripping water pump (4), all be connected with branch pipe (6) between the sewage entrance of first vertical thermosyphon reboiler (2) and second vertical thermosyphon reboiler (3) and strip waste pipe (7), sewage strip water pump (4) exit is connected with sewage pipe (8).
2. The methanol-to-olefin wastewater stripping tower system as claimed in claim 1, wherein 40 layers of sieve plates are arranged inside the sieve plate wastewater stripping tower (1), and the sieve plate wastewater stripping tower (1) adopts a large-hole sieve plate in a tray form, wherein the inner diameter of the tower is 2600mm, the height of the tower is 41560mm, the distance between the plates is 500mm, and the operation flexibility is 2.6.
3. The methanol-to-olefin wastewater stripping tower system according to claim 2, wherein the first vertical thermosyphon reboiler (2) and the second vertical thermosyphon reboiler (3) are both fixed tube-plate heat exchangers.
4. The methanol-to-olefin wastewater stripping tower system according to claim 3, wherein the pressure of the first vertical siphon reboiler (2) and the pressure of the second vertical siphon reboiler (3) are both 0.44MPaG, and the heat transfer area of the first vertical siphon reboiler (2) and the heat transfer area of the second vertical siphon reboiler (3) are both 1182 square meters.
5. The methanol-to-olefin wastewater stripping tower system according to claim 4, wherein the shell-side media of the first vertical thermosyphon reboiler (2) and the second vertical thermosyphon reboiler (3) are both 1.0MPaG saturated steam at 184 ℃, and the tube-side media of the first vertical thermosyphon reboiler (2) and the second vertical thermosyphon reboiler (3) are both stripping wastewater at 154 ℃.
6. The methanol-to-olefin wastewater stripping tower system according to claim 5, wherein the two steam feeding pipes (11) are provided with cut-off valves (10) in a butt-clamping manner.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010047942.0A CN111285421A (en) | 2020-01-16 | 2020-01-16 | Methanol-to-olefin sewage stripping tower system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010047942.0A CN111285421A (en) | 2020-01-16 | 2020-01-16 | Methanol-to-olefin sewage stripping tower system |
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