CN219323881U - Five tower four effect refining plant of crude methyl alcohol - Google Patents
Five tower four effect refining plant of crude methyl alcohol Download PDFInfo
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Abstract
The utility model provides a five tower four-effect refining device of crude methanol, including the prefractionation tower, the negative pressure tower, the pressurization tower, the atmospheric tower, the recovery tower that connects gradually, be equipped with prefractionation tower reboiler, the negative pressure tower reboiler, the pressurization tower reboiler, the atmospheric tower reboiler, the recovery tower reboiler on prefractionation tower, the negative pressure tower reboiler, the pressurization tower reboiler, the atmospheric tower reboiler, the recovery tower reboiler respectively, wherein, refined methanol that the pressurization tower top was adopted carries out heat transfer to prefractionation tower reboiler, the atmospheric tower reboiler, refined methanol that the atmospheric tower top was adopted carries out heat transfer to the negative pressure tower reboiler; the device has the advantages of simple integral structure and low manufacturing cost; the refined methanol extracted from the top of the pressurizing tower can exchange heat not only the reboiler of the pre-rectifying tower, but also the reboiler of the normal pressure tower; refined methanol extracted from the top of the atmospheric tower exchanges heat with the reboiler of the negative pressure tower, the four effects are realized by the pressurizing tower, the thermal coupling of the top of the tower realizes two effects and three effects, and the four effects are realized by the coupling of the top of the atmospheric tower with the negative pressure tower.
Description
Technical Field
The application relates to the technical field of chemical industry, in particular to a crude methanol five-tower four-effect refining device.
Background
Methanol is a chemical basic raw material with wide application, is applied to various fields of fine chemical industry, high polymer, pesticide, medicine, energy source and the like, and has important position in the international chemical market; the crude methanol usually contains light component impurities such as dimethyl ether and the like and heavy component impurities such as ethanol, water and the like, and the refined methanol product meeting the quality requirement can be obtained after various impurities are removed through a rectification process; the energy consumption in the methanol rectification process accounts for about 20-30% of the total energy consumption of production, which has a great influence on the product cost.
The heat utilization of the reboiler and the tower top condenser of the tower equipment is insufficient, the temperature is basically reduced in a circulating water direct cooling mode, the heat is directly lost and is exchanged into the atmosphere, and the occurrence of the thermal coupling technology brings great improvement prospect for energy conservation and emission reduction in the methanol industry.
The traditional methanol rectification process adopts single-tower rectification or double-tower rectification, has the defects of poor product quality, low methanol recovery rate and huge energy consumption despite relatively low equipment investment, and is gradually replaced by a three-tower double-effect rectification and four-tower double-effect rectification process (three towers and recovery towers) developed by Lurgi company of Germany; currently, three-tower or four-tower double-effect rectification technology is adopted in recent domestic production and construction of a methanol rectification device, but with the stricter carbon emission index background, new technology is needed to replace the prior art so as to realize a methanol product with lower steam unit consumption; among them, the multi-effect rectification technique, which refers to the method of dividing the whole rectification process into a plurality of towers with different energy levels, using the tower top steam of the higher temperature tower to supply heat to the reboiler of the lower temperature tower, and condensing the steam. In the multi-effect rectification, the methanol steam generated by the tower top with higher temperature is used for exchanging heat for the reboilers of other towers, so that the steam consumption of the reboilers of other tower kettles is directly reduced to 0 while the condensation of the methanol steam is realized, the steam consumption can be greatly reduced, and the obvious energy-saving effect is further realized.
As in a five-column four-effect methanol rectification process and apparatus of application No. 201911405716.9 in the prior art, there is provided an apparatus comprising a pre-rectification column, a first pressurization column, a second pressurization column, a third pressurization column, a recovery column, a pre-rectification column secondary feed preheater, a pre-rectification column reboiler, a third pressurization column product cooler, a first pressurization column product cooler, a pre-rectification column primary feed preheater, a pre-rectification column reflux drum, a pre-rectification column condensate cooler, a pre-rectification column reflux pump, a first pressurization column feed preheater, a first pressurization column reflux drum, a first pressurization column reflux pump, a first pressurization column reboiler, a second pressurization column condenser, a second pressurization column reflux drum, a third pressurization column primary feed preheater, a second pressurization column reboiler, a third pressurization column feed pump, a third pressurization column secondary feed preheater, a third pressurization column reflux drum, a third pressurization column reboiler, a pressure reduction vapor condenser, a second pressurization column product cooler, a flash distillation recovery column reflux drum, a recovery column condensate cooler, and a recovery column reflux drum; the application mainly has the following technical problems:
1. the structure is complex, and the manufacturing cost is high;
2. the refined methanol extracted from the top of the first pressurizing tower is subjected to heat exchange by a reboiler of a second pressurizing tower, the refined methanol extracted from the top of the second pressurizing tower is subjected to heat exchange by a reboiler of a pre-rectifying tower, and the refined methanol extracted from the top of the third pressurizing tower is subjected to heat exchange by the reboiler of the first pressurizing tower, so that one-to-one heat exchange is adopted;
3. the first pressurizing tower, the second pressurizing tower, the third pressurizing tower and the recovery tower are used for independently extracting refined methanol, a plurality of product coolers are needed, and the method is inconvenient to manage and high in manufacturing cost in occasions with low purity requirements.
In view of the foregoing, a new technical solution is needed to solve the above technical problems.
Disclosure of Invention
The application provides a five tower four-effect refining device of crude methanol, including prefractionation tower, negative pressure tower, pressurization tower, atmospheric tower, the recovery tower that connects gradually, be equipped with prefractionation tower reboiler, negative pressure tower reboiler, pressurization tower reboiler, atmospheric tower reboiler, recovery tower reboiler on prefractionation tower, negative pressure tower, the pressurization tower, atmospheric tower reboiler, the recovery tower reboiler respectively, wherein, the refined methanol that the pressurization tower top was adopted carries out the heat transfer to prefractionation tower reboiler, atmospheric tower reboiler, and the refined methanol that the atmospheric tower top was adopted carries out the heat transfer to the atmospheric tower reboiler.
As a preferable scheme, the top of the pre-rectifying tower is provided with a light component extraction device.
As a preferred scheme, the light component extraction device comprises a first condenser connected with the top of a pre-rectifying tower, the first condenser is connected with a separating tank, the bottom of the first separating tank is connected with the pre-rectifying tower, the top of the first separating tank is connected with a second condenser, the second condenser is connected with the second separating tank, the bottom of the second separating tank is connected with one side of the first separating tank, one side of the second separating tank is provided with a water supplementing port, and the top of the second separating tank is provided with a light phase extraction pipeline.
As a preferable scheme, the refined methanol extracted from the top of the negative pressure tower, the refined methanol extracted from the top of the pressurizing tower, which exchanges heat with the reboiler of the pre-rectifying tower and the reboiler of the normal pressure tower, the refined methanol extracted from the top of the normal pressure tower, which exchanges heat with the reboiler of the negative pressure tower, and the refined methanol extracted from the top of the recovery tower are respectively connected with a mixer through a refined methanol pipeline I, a refined methanol pipeline II, a refined methanol pipeline III and a refined methanol pipeline IV, and the outlet end of the mixer is connected with a cooler.
As a preferable scheme, the top of negative pressure tower is equipped with negative pressure tower reflux unit, negative pressure tower reflux unit includes negative pressure tower cooler, negative pressure tower cooler is connected with negative pressure tower reflux drum, and the bottom of negative pressure tower reflux drum is connected with the negative pressure tower, and negative pressure tower reflux drum is connected with the blender through smart methanol pipeline one.
As a preferable scheme, the top of the pressurizing tower is provided with a pressurizing tower reflux device, the pressurizing tower reflux device comprises a pressurizing tower cooler, the pressurizing tower cooler is connected with a pressurizing tower reflux tank, the bottom of the pressurizing tower reflux tank is connected with the pressurizing tower, and the bottom of the pressurizing tower reflux tank is connected with a mixer through a refined methanol pipeline II.
As a preferable scheme, the top of the pressurizing tower is connected with a pre-rectifying tower reboiler through a first heat exchange pipeline, the pre-rectifying tower reboiler is connected with a pressurizing tower reflux tank through a first reflux pipeline, the top of the pressurizing tower is also connected with an atmospheric tower reboiler through a second heat exchange pipeline, and the atmospheric tower reboiler is connected with the pressurizing tower reflux tank through a second reflux pipeline.
As a preferable scheme, the top of the atmospheric tower is provided with an atmospheric tower reflux device, the atmospheric tower reflux device comprises an atmospheric tower cooler, the atmospheric tower cooler is connected with an atmospheric tower reflux tank, the bottom of the atmospheric tower reflux tank is connected with the atmospheric tower, and the bottom of the atmospheric tower reflux tank is also connected with a mixer through a refined methanol pipeline III.
As a preferable scheme, the top of the atmospheric tower is connected with a negative pressure tower reboiler through a heat exchange pipeline III, and the negative pressure tower reboiler is connected with an atmospheric tower reflux tank through a reflux pipeline III.
As a preferred scheme, recovery tower reflux unit is equipped with at the top of recovery tower, recovery tower reflux unit includes recovery tower cooler, recovery tower cooler is connected with recovery tower reflux tank, the bottom of recovery tower reflux tank with the recovery tower is connected, the bottom of recovery tower reflux tank still is connected with the blender through smart methanol pipeline IV.
As a preferable scheme, a recovery tower side mining pipeline is arranged on the side wall of the recovery tower.
The device has the advantages of simple integral structure and low manufacturing cost; the refined methanol extracted from the top of the pressurizing tower can exchange heat not only the reboiler of the pre-rectifying tower, but also the reboiler of the normal pressure tower; the refined methanol extracted from the top of the atmospheric tower exchanges heat with a reboiler of the negative pressure tower; in the five-tower four-effect process, one effect is realized through the pressurizing tower, the tower top thermal coupling realizes two effects and three effects, and the four effects are realized through the atmospheric tower top coupling negative pressure tower; preferably, refined methanol extracted from the top of the negative pressure tower, refined methanol extracted from the top of the pressurizing tower and subjected to heat exchange by a reboiler of the pre-rectifying tower and a reboiler of the normal pressure tower, refined methanol extracted from the top of the normal pressure tower and subjected to heat exchange by the reboiler of the negative pressure tower, refined methanol extracted from the top of the recovery tower are respectively connected with a mixer through a first refined methanol pipeline, a second refined methanol pipeline, a third refined methanol pipeline and a fourth refined methanol pipeline, the outlet end of the mixer is connected with a cooler, all refined methanol is mixed in a mixed extraction mode, and the requirements can be met by only one cooler, so that the device is convenient to manage and low in use cost.
Drawings
FIG. 1 is a schematic structural view of the present application;
1. prefractionator 2, negative pressure column 3, pressurization column 4, and atmospheric column
5. Recovery tower 6, extraction pipeline 7, pump 8, and feed line
9. Preheater one 10, preheater two 11, pre-rectifying tower reboiler
12. Negative pressure tower reboiler 13, pressurized tower reboiler 14, and atmospheric tower reboiler
15. Recovery tower reboiler 16, first condenser 17, first separator tank
18. Condenser two 19, knockout drum two 20, water filling port
21. Light phase extraction pipeline 22, refined methanol pipeline one 23 and reflux pipeline one
24. Refined methanol pipeline II 25, refined methanol pipeline III 26 and refined methanol pipeline IV
27. Mixer 28, cooler 29, negative pressure tower cooler
30. Negative pressure tower reflux drum 31, heat exchange pipeline one 32, heat exchange pipeline two
33. Reflux line two 34, pressurized tower cooler 35, pressurized tower reflux drum
36. Heat exchange line three 37, atmospheric tower cooler 38, atmospheric tower reflux drum
39. Reflux line III 40, recovery tower cooler 41, recovery tower reflux drum
42. Recovery tower side adopts the pipeline.
Detailed Description
The following describes the embodiment of the present utility model in detail with reference to fig. 1. It should be noted that the detailed description herein is presented for purposes of illustration and explanation only and is not intended to limit the utility model.
Embodiment one:
the utility model provides a five tower four-effect refining device of crude methanol, including prefractionation tower 1, negative pressure tower 2, pressurization tower 3, atmospheric tower 4, recovery tower 5 that connect gradually, more specifically, the tower cauldron of prefractionation tower 1 is connected with the well lower part of negative pressure tower 2 through extraction pipeline 6, and the tower cauldron of negative pressure tower 2 is connected with the well lower part of pressurization tower 3 through extraction pipeline 6, and the tower cauldron of pressurization tower 3 is connected with the well lower part of atmospheric tower 4 through extraction pipeline 6, and the tower cauldron of atmospheric tower 4 directly gathers the material, and the well lower part of atmospheric tower 4 is connected with the well lower part of recovery tower 5 through extraction pipeline 6, is equipped with corresponding pump 7 according to the actual conditions on the above-mentioned extraction pipeline 6; a feed pipeline 8 is arranged at the middle upper part of the pre-rectifying tower 1, preferably, a first preheater 9 is arranged on the feed pipeline 8, and a second preheater 10 is arranged on a production pipeline 6 at the bottom of the tower kettle of the negative pressure tower 2; the pre-rectifying tower 1, the negative pressure tower 2, the pressurizing tower 3, the normal pressure tower 4 and the recovery tower 5 are respectively provided with a pre-rectifying tower reboiler 11, a negative pressure tower reboiler 12, a pressurizing tower reboiler 13, a normal pressure tower reboiler 14 and a recovery tower reboiler 15, wherein refined methanol extracted from the top of the pressurizing tower 3 exchanges heat with the pre-rectifying tower reboiler 11 and the normal pressure tower reboiler 14, and refined methanol extracted from the top of the normal pressure tower 4 exchanges heat with the negative pressure tower reboiler 12.
In the application, the five-tower four-effect process realizes one effect through the pressurizing tower 3, the tower top thermal coupling realizes two effects and three effects, and the atmospheric tower 4 is coupled with the negative pressure tower 2 to realize four effects.
Embodiment two:
in this embodiment, a light component extraction device is disposed at the top of the pre-rectifying tower 1, so as to extract a light phase component at the top of the pre-rectifying tower 1, specifically:
the light component extraction device comprises a first condenser 16 connected with the top of the pre-rectifying tower 1, the first condenser 16 is connected with a first separation tank 17, the bottom of the first separation tank 17 is connected with the pre-rectifying tower 1, the top of the first separation tank 17 is connected with a second condenser 18, the second condenser 18 is connected with a second separation tank 19, the bottom of the second separation tank 19 is connected with one side of the first separation tank 17, one side of the second separation tank 19 is provided with a water supplementing port 20, and the top of the second separation tank 19 is provided with a light phase extraction pipeline 21; the gas phase at the top of the pre-rectifying tower 1 is condensed by the first condenser 16 and then enters the first separating tank 17, the liquid in the first separating tank 17 flows back to the pre-rectifying tower 1, the gas phase is condensed by the second condenser 18 and then enters the second separating tank 19, the liquid phase in the second separating tank 19 flows back to the first separating tank 17, and the light phase component in the second separating tank 19 is extracted through the light phase extraction pipeline 21 as the gas phase.
Embodiment III:
in this embodiment, the manufacturing cost of the device is further reduced, which is convenient for use and management, specifically:
the refined methanol extracted from the top of the negative pressure tower 2, the refined methanol extracted from the top of the pressurizing tower 2, the refined methanol extracted from the top of the normal pressure tower 4 and the refined methanol extracted from the top of the recovery tower 15 are respectively connected with a mixer 27 through a refined methanol pipeline I22, a refined methanol pipeline II 24, a refined methanol pipeline III 25 and a refined methanol pipeline IV 26, and the outlet end of the mixer 27 is connected with a cooler 28; all the extracted refined methanol enters the mixer 27, is extracted after being mixed by the mixer 27, only one cooler 28 is needed, and the use is convenient, meanwhile, the complexity of the equipment is simplified, and the manufacturing cost of the equipment is reduced.
Embodiment four:
in order to reduce the steam consumption during methanol rectification, in particular:
the top of the negative pressure tower 2 is provided with a negative pressure tower reflux device, the negative pressure tower reflux device comprises a negative pressure tower cooler 29, the negative pressure tower cooler 29 is connected with a negative pressure tower reflux tank 30, the bottom of the negative pressure tower reflux tank 30 is connected with the negative pressure tower 2, and the negative pressure tower reflux tank 30 is connected with a mixer 27 through a refined methanol pipeline I22; the material at the top of the negative pressure tower 2 is cooled by a negative pressure tower cooler 29 and then enters a negative pressure tower reflux tank 30, a part of refined methanol in the negative pressure tower reflux tank 30 is refluxed to the negative pressure tower 2, and a part of refined methanol enters a mixer 27 through a refined methanol pipeline I22.
The top of the pressurizing tower 3 is provided with a pressurizing tower reflux device, the pressurizing tower reflux device comprises a pressurizing tower cooler 34, the pressurizing tower cooler 34 is connected with a pressurizing tower reflux tank 35, the bottom of the pressurizing tower reflux tank 35 is connected with the pressurizing tower 3, and the bottom of the pressurizing tower reflux tank 35 is also connected with a refined methanol pipeline II 24; the top of the pressurizing tower 3 is connected with a pre-rectifying tower reboiler 11 through a first heat exchange pipeline 31, the pre-rectifying tower reboiler 11 is connected with a pressurizing tower reflux tank 35 through a first reflux pipeline 23, the pressurizing tower reflux tank 35 is connected with a mixer 27 through a second refined methanol pipeline 24, the top of the pressurizing tower 3 is also connected with an atmospheric tower reboiler 14 through a second heat exchange pipeline 32, the atmospheric tower reboiler 14 is connected with a pressurizing tower reflux tank 35 through a second reflux pipeline 33, and the pressurizing tower reflux tank 35 is connected with the mixer 27 through a third refined methanol pipeline 24; a part of refined methanol material at the top of the pressurizing tower 3 exchanges heat with the pre-rectifying tower reboiler 11 through a first heat exchange pipeline 31, a part exchanges heat with the normal pressure tower reboiler 14 through a second heat exchange pipeline 32, refined methanol after heat exchange with the pre-rectifying tower reboiler 11 enters the pressurizing tower reflux tank 35 through a first reflux pipeline 23, a part of refined methanol after heat exchange with the normal pressure tower reboiler 14 flows back into the pressurizing tower reflux tank 35 through a second reflux pipeline 33, a part of methanol in the pressurizing tower reflux tank 35 flows back into the pressurizing tower 3, and a part of methanol enters the mixer 27 through a second pipeline of refined methanol.
The top of the atmospheric tower 4 is provided with an atmospheric tower reflux device, the atmospheric tower reflux device comprises an atmospheric tower cooler 37, the atmospheric tower cooler 37 is connected with an atmospheric tower reflux tank 38, the bottom of the atmospheric tower reflux tank 38 is connected with the atmospheric tower 4, and the bottom of the atmospheric tower reflux tank 38 is also connected with the mixer 27 through a refined methanol pipeline III 25; the top of the atmospheric tower 4 is connected with a negative pressure tower reboiler 12 through a heat exchange pipeline III 36, and the negative pressure tower reboiler 12 is communicated with an atmospheric tower reflux tank 38 through a reflux pipeline III 39; the materials extracted from the top of the atmospheric tower 4 exchange heat with the negative pressure tower reboiler 12 through a heat exchange pipeline III 36, the refined methanol after heat exchange enters into an atmospheric tower reflux tank 38 through a reflux pipeline III 39, part of the methanol in the atmospheric tower reflux tank 38 is refluxed to the atmospheric tower 4, and the other part of the methanol enters into the mixer 27 through a refined methanol pipeline III 25.
The top of the recovery tower 5 is provided with a recovery tower reflux device, the recovery tower reflux device comprises a recovery tower cooler 40, the recovery tower cooler 40 is connected with a recovery tower reflux tank 41, the bottom of the recovery tower reflux tank 41 is connected with the recovery tower 5, and the bottom of the recovery tower reflux tank 41 is also connected with the mixer 27 through a refined methanol pipeline IV 26; refined methanol at the top of the recovery tower 5 enters a recovery tower reflux tank 41 after being cooled by a recovery tower cooler 40, one part of refined methanol in the recovery tower reflux tank 41 enters the recovery tower 5 for reflux, and the other part of refined methanol is connected with a mixer 27 through a refined methanol pipeline IV 26; the recovery tower side extraction pipeline 42 on the side wall of the recovery tower 5 is used for extracting the impurity alcohol, and the material on the tower bottom of the recovery tower 5 is extracted as wastewater.
The specific working principle of the utility model is as follows:
raw materials are preheated to 60-90 ℃ through a feed pipeline 8 and a preheater I9 and are conveyed to a pre-rectifying tower 1, light phase components at the top of the pre-rectifying tower 1 are extracted, tower kettle discharge is conveyed to a negative pressure tower 2 through a pump 7 for methanol rectification, refined methanol at the top of the negative pressure tower 2 is conveyed to a mixer 27 for extraction, the tower kettle discharge of the negative pressure tower 2 is conveyed to a pressurizing tower 3 through the pump 7 and a preheater II 10, a part of refined methanol at the top of the pressurizing tower 3 is conveyed to a pre-tower reboiler 11 for heat exchange, a part of refined methanol is conveyed to an atmospheric tower reboiler 14 for heat exchange, two materials after heat exchange are conveyed to a pressurizing tower reflux tank 35, methanol products of the pressurizing tower reflux tank 35 are conveyed to a mixer 27 for extraction through a refined methanol pipeline II 24, the tower kettle discharge of the pressurizing tower 3 is conveyed to an atmospheric tower 4 through the pump 7, refined methanol at the top of the atmospheric tower 4 is conveyed to a negative pressure tower 12 for heat exchange, materials after heat exchange are conveyed to an atmospheric tower reflux tank 38, methanol products of the reflux tank 38 are conveyed to the mixer 27 through a refined methanol pipeline III 25, a distilled methanol recovery tower 4 at the top of the side stream 5 is conveyed to a mixed material recovery tower 5, and the recovered waste water is conveyed to the rectifying tower 5; finally, refined methanol is extracted to a methanol storage tank through a product cooler 28 after being mixed by a mixer 27.
Fifth embodiment:
the present application provides a specific embodiment, in particular:
the pressure of the whole pre-rectifying tower 1 is 110-180kPaA, the pressure of the whole negative pressure tower 2 is 40-70kPaA, the pressure of the whole pressurizing tower 3 is 600-900kPaA, the pressure of the whole normal pressure tower 4 is 100-140kPaA, and the pressure of the whole recovery tower 5 is 100-140kPaA.
When the feeding amount is 187500kg/h and the related parameters of the process are optimized to be optimal, the five-tower four-effect thermal coupling production process is used for producing steam/refined methanol with the energy consumption of about 0.60 ton, wherein the purity of the methanol can reach more than 99.99 percent, and the ethanol content is less than 50ppm.
By the recovery device, the steam unit consumption in the methanol production process can be greatly reduced to 0.55-0.65, compared with the conventional three-tower four-tower process methanol/steam unit consumption (unit consumption is 1.1-1.5), the energy consumption is nearly halved, the recovery device has good development prospect for energy conservation, emission reduction, yield increase and cost reduction of enterprises, and the production cost can be greatly reduced for the enterprises under the background that the existing steam is more expensive, and the benefit is more obvious with the passage of time.
The advantages of this embodiment are:
1. methanol with the concentration of more than 99.99 percent can be extracted, and the ethanol content is controlled to be 50ppm;
2. the five-tower four-effect process flow is adopted, the latent heat of the steam at the top of the tower is fully utilized, and the thermal coupling technology is adopted, so that the steam consumption is greatly reduced;
3. compared with the traditional methanol process, the steam unit consumption can be reduced to 0.55-0.65;
4. the traditional process can be modified, and the energy consumption is greatly reduced;
the five-tower four-effect process flow comprises five main equipment towers of a pre-rectifying tower 1, a negative pressure tower 2, a pressurizing tower 3, an atmospheric tower 4 and a recovery tower 5; the four effects realize one effect through the pressurizing tower 3, the methanol steam at the top of the pressurizing tower 3 is thermally coupled with the pre-rectifying tower 1 and the normal pressure tower 4, the two effects and the three effects are realized by providing heat sources for the pre-rectifying tower reboiler 11 and the normal pressure tower reboiler 14, the four effects are realized by the steam at the top of the normal pressure tower 4 and the negative pressure tower 2, the four effects are realized by providing heat sources for the negative pressure tower reboiler 12, and finally the heat multi-stage utilization is realized.
The device has the advantages of simple integral structure and low manufacturing cost; the refined methanol extracted from the top of the pressurizing tower 3 can exchange heat not only the pre-rectifying tower reboiler 11 but also the normal pressure tower reboiler 14; the refined methanol extracted from the top of the atmospheric tower 4 exchanges heat with the negative pressure tower reboiler 12; in the five-tower four-effect process, one effect is realized through the pressurizing tower 3, two effects and three effects are realized through the tower top thermal coupling, and four effects are realized through the atmospheric tower 4 and the tower top coupling negative pressure tower; preferably, refined methanol extracted from the top of the negative pressure tower 2, refined methanol extracted from the top of the pressurizing tower 3, refined methanol extracted from the top of the normal pressure tower 4 and refined methanol extracted from the top of the recovery tower 5 are respectively connected with the mixer 27 through a refined methanol pipeline I22, a refined methanol pipeline II 24, a refined methanol pipeline III 25 and a refined methanol pipeline IV 26, the outlet end of the mixer 27 is connected with the cooler 28, all refined methanol is mixed in a mixed extraction mode, only one cooler 28 is needed to meet the requirements, the management is convenient, and the use cost is low.
The above devices, connection relationships, etc. which are not specifically described belong to the prior art, and the present utility model is not specifically described herein.
The preferred embodiments of the present application have been described in detail above with reference to the accompanying drawings, but the present application is not limited to the specific details of the foregoing embodiments, and various simple modifications may be made to the technical solutions of the present application within the scope of the technical concept of the present application, and all the simple modifications belong to the protection scope of the present application.
In addition, the specific features described in the foregoing embodiments may be combined in any suitable manner, and in order to avoid unnecessary repetition, various possible combinations of the present utility model are not described in detail.
Moreover, any combination of the various embodiments of the present application may be made without departing from the spirit of the present application, which is also to be considered as disclosed herein.
Claims (10)
1. The utility model provides a five tower four-effect refining device of crude methanol, its characterized in that, including prefractionation tower (1), negative pressure tower (2), pressurization tower (3), atmospheric tower (4), recovery tower (5) that connect gradually, prefractionation tower (1), negative pressure tower (2), pressurization tower (3), atmospheric tower (4), recovery tower (5) are last to be equipped with respectively and to be equipped with prefractionation tower reboiler (11), negative pressure tower reboiler (12), pressurization tower reboiler (13), atmospheric tower reboiler (14), recovery tower reboiler (15), wherein, the smart methanol that the top of pressurization tower (3) was adopted carries out heat transfer to prefractionation tower reboiler (11), atmospheric tower reboiler (14), and the smart methanol that the top of atmospheric tower (4) was adopted carries out heat transfer to negative pressure tower reboiler (12).
2. The crude methanol five-tower four-effect refining device according to claim 1, wherein a light component extraction device is arranged at the top of the pre-rectifying tower (1).
3. The crude methanol five-tower four-effect refining device according to claim 2, wherein the light component extraction device comprises a first condenser (16) connected with the top of the pre-rectifying tower (1), the first condenser (16) is connected with a first separation tank (17), the bottom of the first separation tank (17) is connected with the pre-rectifying tower (1), the top of the first separation tank (17) is connected with a second condenser (18), the second condenser (18) is connected with a second separation tank (19), the bottom of the second separation tank (19) is connected with one side of the first separation tank (17), one side of the second separation tank (19) is provided with a water supplementing port (20), and the top of the second separation tank (19) is provided with a light phase extraction pipeline (21).
4. The five-tower four-effect refining device for crude methanol according to claim 1, wherein the refined methanol extracted from the top of the negative pressure tower (2), the refined methanol extracted from the top of the pressurizing tower (3), the refined methanol extracted from the top of the normal pressure tower (4) and the refined methanol extracted from the top of the recovery tower (5) are respectively connected with a mixer (27) through a refined methanol pipeline I (22), a refined methanol pipeline II (24), a refined methanol pipeline III (25) and a refined methanol pipeline IV (26), and the outlet end of the mixer (27) is connected with a cooler (28).
5. The crude methanol five-tower four-effect refining device according to claim 4, wherein a negative pressure tower reflux device is arranged at the top of the negative pressure tower (2), the negative pressure tower reflux device comprises a negative pressure tower cooler (29), the negative pressure tower cooler (29) is connected with a negative pressure tower reflux tank (30), the bottom of the negative pressure tower reflux tank (30) is connected with the negative pressure tower (2), and the negative pressure tower reflux tank (30) is connected with a mixer (27) through a refined methanol pipeline I (22).
6. The crude methanol five-tower four-effect refining device according to claim 5, wherein a pressurizing tower reflux device is arranged at the top of the pressurizing tower (3), the pressurizing tower reflux device comprises a pressurizing tower cooler (34), the pressurizing tower cooler (34) is connected with a pressurizing tower reflux tank (35), the bottom of the pressurizing tower reflux tank (35) is connected with the pressurizing tower (3), and the bottom of the pressurizing tower reflux tank (35) is connected with a mixer (27) through a refined methanol pipeline II (24).
7. The crude methanol five-tower four-effect refining device according to claim 6, wherein the top of the pressurizing tower (3) is connected with a pre-rectifying tower reboiler (11) through a first heat exchange pipeline (31), the pre-rectifying tower reboiler (11) is connected with a pressurizing tower reflux tank (35) through a first reflux pipeline (23), the top of the pressurizing tower (3) is also connected with an atmospheric tower reboiler (14) through a second heat exchange pipeline (32), and the atmospheric tower reboiler (14) is connected with the pressurizing tower reflux tank (35) through a second reflux pipeline (33).
8. The crude methanol five-tower four-effect refining device according to claim 4, wherein an atmospheric tower reflux device is arranged at the top of the atmospheric tower (4), the atmospheric tower reflux device comprises an atmospheric tower cooler (37), the atmospheric tower cooler (37) is connected with an atmospheric tower reflux tank (38), the bottom of the atmospheric tower reflux tank (38) is connected with the atmospheric tower (4), and the bottom of the atmospheric tower reflux tank (38) is connected with a mixer (27) through a refined methanol pipeline III (25).
9. The crude methanol five-tower four-effect refining apparatus as claimed in claim 8, wherein the top of the atmospheric tower (4) is connected with a negative pressure tower reboiler (12) through a heat exchange line III (36), and the negative pressure tower reboiler (12) is connected with an atmospheric tower reflux drum (38) through a reflux line III (39).
10. The crude methanol five-tower four-effect refining device according to claim 4, wherein a recovery tower reflux device is arranged at the top of the recovery tower (5), the recovery tower reflux device comprises a recovery tower cooler (40), the recovery tower cooler (40) is connected with a recovery tower reflux tank (41), the bottom of the recovery tower reflux tank (41) is connected with the recovery tower (5), and the bottom of the recovery tower reflux tank (41) is also connected with a mixer (27) through a refined methanol pipeline IV (26).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
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