CN220404868U - Five-tower four-effect crude methanol refining equipment - Google Patents
Five-tower four-effect crude methanol refining equipment Download PDFInfo
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- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 title claims abstract description 225
- 238000007670 refining Methods 0.000 title claims abstract description 20
- 238000011084 recovery Methods 0.000 claims abstract description 82
- 238000004064 recycling Methods 0.000 claims abstract description 7
- 238000010992 reflux Methods 0.000 claims description 97
- 238000003808 methanol extraction Methods 0.000 claims description 64
- 238000000605 extraction Methods 0.000 claims description 37
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 6
- 238000010926 purge Methods 0.000 claims description 4
- 238000000034 method Methods 0.000 abstract description 13
- 230000008569 process Effects 0.000 abstract description 12
- 230000008878 coupling Effects 0.000 abstract description 4
- 238000010168 coupling process Methods 0.000 abstract description 4
- 238000005859 coupling reaction Methods 0.000 abstract description 4
- 238000005265 energy consumption Methods 0.000 description 16
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 10
- 238000003860 storage Methods 0.000 description 8
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 4
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 4
- 229910052799 carbon Inorganic materials 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000000047 product Substances 0.000 description 3
- 230000009467 reduction Effects 0.000 description 3
- 229910002092 carbon dioxide Inorganic materials 0.000 description 2
- 239000001569 carbon dioxide Substances 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 239000002351 wastewater Substances 0.000 description 2
- 238000012824 chemical production Methods 0.000 description 1
- 239000013064 chemical raw material Substances 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 238000002407 reforming Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 230000002194 synthesizing effect Effects 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
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Abstract
The application provides five-tower four-effect crude methanol refining equipment which comprises a pre-rectifying tower, a negative pressure rectifying tower, a pressurizing rectifying tower, a normal pressure rectifying tower and a recovery tower, wherein the mode of combining thermal coupling and a heat pump is adopted, so that the aim of more than 30% of expansion of the traditional three-tower methanol rectifying process and 45% -50% of steam consumption can be realized for the stock market; for the newly added market, the investment is small, the operability is strong, and energy-saving measures such as optimizing heat recycling by adopting a heat exchange network are adopted, so that the steam consumption is greatly reduced, and the consumption of each ton of methanol can be reduced to below 0.5 ton of steam.
Description
Technical Field
The application relates to the technical field of chemical equipment, in particular to five-tower four-effect crude methanol refining equipment.
Background
Methanol is used as a basic chemical raw material, the industrial application is wide, the demand of methanol is increased gradually, the production of impurities is always carried out in the process of synthesizing the methanol, the crude methanol contains water and various organic impurities, rectification treatment is needed, the rectification of the crude methanol is an important process for determining the quality of methanol products, a rectification device belongs to a high-energy consumption device in the chemical production process, the energy consumption of the methanol rectification is about 20% -30% of the total energy consumption of the methanol production at present, and enterprises are required to carry out energy-saving technical transformation on the premise of developing strategy of 'carbon emission reduction and carbon reaching peaks', so as to reduce the carbon footprint and the emission of carbon dioxide, thus reducing the energy consumption of the methanol rectification process flow is a great challenge facing the enterprises.
The rectification is a key link of methanol generation, on one hand, as the rectification is at the tail end of the generation link, the performance of the rectification directly influences the quality and the yield of a terminal product, and the rectification has great influence on the income of enterprises; on the other hand, as the energy consumption of rectification is relatively large in total energy consumption, reducing the energy consumption of the rectification link is an important task for enterprises to save cost and fulfill the aim of emission reduction; therefore, when the chemical rectification separation system is designed, especially the methanol rectification system is designed, the integral optimization for achieving a plurality of targets such as unit energy consumption, yield, product quality and the like is the key point and the difficulty of the design.
The traditional methanol rectification process adopts a three-tower double-effect process, and although the equipment investment is relatively low, the energy consumption for producing single ton of refined alcohol is about 1.2t of steam, and a series of new technologies are currently and domestically flushed:
prior art 1: the Chinese patent application number is: 201820870873.1 a three-tower three-effect crude methanol refining process system, which is characterized in that one effect is added on the basis of the traditional flow, and the energy consumption is reduced from 1.2t steam/ton refined alcohol to 0.8t steam/ton refined alcohol;
prior art 2: the Chinese patent application number is: 2019210669710 a four-tower four-effect crude methanol refining process system, which is added with a secondary pressurizing tower on the basis of the traditional flow, increases two-effect thermal coupling, reduces the energy consumption from 1.2t steam/ton refined alcohol to 0.75t steam/ton refined alcohol, and can be used for expanding production and reforming projects;
prior art 3: the Chinese patent application number is: 2022206406822 a four-tower forward and backward mixed flow four-effect crude methanol refining process system is added with a negative pressure tower and a heat pump on the basis of the traditional flow, and the energy consumption is reduced from 1.2t steam/ton refined alcohol to 0.7t steam/ton refined alcohol by adding two-effect thermal coupling.
The energy consumption of the prior art is further improved, and the technology with lower energy consumption adopts heat pumps in most of the current technologies, but the electricity price of some areas is more expensive, and the technology is not suitable for high-power heat pumps.
Therefore, a new technical scheme is needed to be provided, so that the energy consumption is reduced, the carbon footprint is reduced, and the emission of carbon dioxide is reduced.
Disclosure of Invention
The utility model provides a five tower four-effect crude methanol refining equipment, includes the pre-rectifying column, negative pressure rectifying column, pressurization rectifying column, ordinary pressure rectifying column, recovery tower that connect gradually, the lower part of pre-rectifying column is connected with pre-rectifying column reboiler one and pre-rectifying column reboiler two, the lower part of negative pressure rectifying column is connected with negative pressure rectifying column reboiler one and negative pressure rectifying column reboiler two, the lower part of pressurization rectifying column, ordinary pressure rectifying column, recovery tower is connected with pressurization rectifying column reboiler, ordinary pressure rectifying column reboiler, recovery tower reboiler respectively, wherein, the top of pressurization rectifying column is connected with ordinary pressure rectifying column reboiler through pressurization rectifying column extraction pipeline, and ordinary pressure rectifying column reboiler is connected with the pressure rectifying column methanol extraction device, and the top of ordinary pressure rectifying column is connected with negative pressure rectifying column reboiler extraction pipeline and negative pressure rectifying column extraction device, and negative pressure rectifying column methanol extraction device is connected with pre-rectifying column reboiler extraction pipeline and pre-rectifying column extraction device, and the top of pre-rectifying column is connected with the recovery tower extraction device of ordinary pressure rectifying column extraction pipeline, and recovery tower extraction device is connected with the top of ordinary pressure rectifying column extraction device. As a preferred scheme, the second pre-rectifying tower reboiler is connected with the pre-rectifying tower through a pre-rectifying tower reflux device, the pre-rectifying tower reflux device comprises a pre-rectifying tower buffer tank, the pre-rectifying tower buffer tank is connected with the first negative pressure rectifying tower reboiler through a pre-rectifying tower heat exchange pipeline, the top of the pre-rectifying tower buffer tank is connected with a purge gas discharge pipeline, one side of the pre-rectifying tower buffer tank is connected with an extraction water pipeline, and the bottom of the pre-rectifying tower buffer tank is connected with the pre-rectifying tower through the pre-rectifying tower reflux pipeline.
As a preferable scheme, the pre-tower reflux pipeline is provided with a pre-tower reflux pump.
As a preferred scheme, the negative pressure rectifying column refined methanol extraction device comprises a negative pressure column top reflux tank, wherein the negative pressure column top reflux tank is connected with the top of a negative pressure rectifying column through a negative pressure rectifying column top extraction pipeline, a negative pressure column condenser is arranged on the negative pressure rectifying column top extraction pipeline, the bottom of the negative pressure column top reflux tank is connected with a negative pressure column refined methanol extraction pipeline, a negative pressure column refined methanol extraction pump is arranged on the negative pressure column refined methanol extraction pipeline, and a negative pressure column reflux pipeline is connected with the negative pressure column refined methanol extraction pipeline at the rear part of the negative pressure column refined methanol extraction pump and is connected with the middle upper part of the negative pressure rectifying column.
As a preferable scheme, the refined methanol extraction pipeline of the negative pressure tower is connected with a refined methanol extraction device.
As a preferable scheme, the upper part of the reflux tank at the top of the negative pressure tower is provided with a vacuumizing pipeline, and the vacuumizing pipeline is sequentially provided with a negative pressure tower condenser II and a vacuum pump.
As a preferred scheme, the pressurized rectifying tower refined methanol extraction device comprises a pressurized tower top reflux tank, wherein the pressurized tower top reflux tank is connected with a normal pressure rectifying tower reboiler through a pressurized tower heat exchange pipeline, the bottom of the pressurized tower top reflux tank is connected with the middle upper part of the pressurized rectifying tower through a pressurized tower reflux pipeline, a pressurized tower reflux pump is arranged on the pressurized tower reflux pipeline, and the pressurized tower reflux pipeline is also connected with a pressurized tower refined methanol extraction pipeline.
As a preferable scheme, the refined methanol extraction pipeline of the pressurizing tower is connected with a refined methanol storage device.
As a preferred scheme, the normal pressure rectifying tower refined methanol extraction device comprises a normal pressure tower top reflux tank, the normal pressure tower top reflux tank is connected with a negative pressure rectifying tower reboiler I through a normal pressure tower heat exchange pipeline, the bottom of the normal pressure tower top reflux tank is connected with a normal pressure tower refined methanol extraction pipeline, a normal pressure tower refined methanol extraction pump is arranged on the normal pressure tower refined methanol extraction pipeline, a normal pressure tower reflux pipeline is connected on the normal pressure tower refined methanol extraction pipeline at the rear part of the normal pressure tower refined methanol extraction pump, and the normal pressure tower reflux pipeline is connected with the middle upper part of the normal pressure rectifying tower.
As a preferable scheme, the refined methanol extraction pipeline of the atmospheric tower is connected with a refined methanol storage device.
As a preferred scheme, recovery tower smart methanol extraction device includes recovery tower reflux drum, recovery tower reflux drum is connected with the top of recovery tower through recovery tower top extraction pipeline, is equipped with recovery tower top condenser on the recovery tower top extraction pipeline, and the bottom of recovery tower reflux drum is connected with recovery tower smart methanol extraction pipeline, be provided with the recovery tower pump on the recovery tower smart methanol extraction pipeline, be connected with recovery tower reflux pipeline on the recovery tower smart methanol extraction pipeline of recovery tower pump rear portion, recovery tower reflux pipeline is connected with the well upper portion of recovery tower.
As a preferable scheme, a refined methanol extraction pipeline of the recovery tower is connected with a refined methanol storage device, and the refined methanol storage device.
As a preferable scheme, the pre-rectifying tower reboiler II, the pressurizing rectifying tower reboiler and the recovery tower reboiler are respectively connected with a steam pipeline, and the pre-rectifying tower reboiler II, the pressurizing rectifying tower reboiler and the recovery tower reboiler are respectively connected with the pre-rectifying tower preheater through steam reflux pipelines.
As a preferred embodiment, the pre-tower preheater is connected to the pre-rectification tower via a feed line.
The method adopts improved five-tower four-effect crude methanol refining equipment, and can realize the purposes of more than 30% of expansion of the traditional three-tower methanol rectification (forward-flow double-effect rectification) process and 45% -50% reduction of steam consumption for the stock market; for the newly added market, the investment is small, the operability is strong, and energy-saving measures such as optimizing heat recycling by adopting a heat exchange network are adopted, so that the steam consumption is greatly reduced, and the consumption of each ton of refined methanol can be reduced to below 0.5 ton of steam.
Drawings
FIG. 1 is a schematic illustration of the present application;
1. prefractionator 2, negative pressure rectifier 3, pressurized rectifier 4, and atmospheric rectifier
5. Recovery tower 6, pre-rectifying tower reboiler I7 and pre-rectifying tower reboiler II
8. Negative pressure rectifying tower reboiler one 9, negative pressure rectifying tower reboiler two 10, pressurized rectifying tower reboiler 11, normal pressure rectifying tower reboiler 12, recovery tower reboiler 13, pressurized rectifying tower extraction line 14, normal pressure rectifying tower extraction line 15, refined methanol storage device 16, normal pressure tower heat exchange line
17. Atmospheric tower top reflux tank 18 and atmospheric tower refined methanol extraction pipeline
19. Atmospheric tower refined methanol extraction pump 20, atmospheric tower reflux pipeline 21 and prefractionation tower extraction pipeline
22. Prefractionation column heat exchange line 23, prefractionation buffer tank 24, prefractionation column top cooler
25. Purge gas discharge line 26, extraction water line 27, pre-tower reflux line
28. Pre-tower reflux pump 29, pressurized tower heat exchange line 30, pressurized tower overhead reflux drum
31. A pressurizing tower reflux pipeline 32, a pressurizing tower refined methanol extraction pipeline 33, a pressurizing tower reflux pump 34, a steam pipeline 35, a steam reflux pipeline 36, a pre-tower preheater 37, a feeding pipeline 38, a pre-rectifying tower bottom pipeline 39, a negative pressure rectifying tower bottom pipeline 40 and a pressurizing tower feeding preheater
41. Bottom pipeline 42 of pressurized rectifying tower and side pipeline of normal pressure rectifying tower
43. Recovery tower top extraction pipeline 44, recovery tower reflux drum 45 and recovery tower top condenser
46. Recovery tower reflux line 47, recovery tower pump 48, recovery tower refined methanol extraction line
49. Negative pressure rectifying tower top extraction pipeline 50, negative pressure tower top reflux tank 51 and negative pressure tower condenser
52. Negative pressure tower refined methanol extraction pipeline 53, negative pressure tower refined methanol extraction pump 54 and vacuumizing pipeline
55. Negative pressure tower condenser two 56, vacuum pump 59, negative pressure tower return line 60, heat pump
61. And (5) extracting a pump from the normal pressure rectifying tower.
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 embodiment provides five-tower four-effect crude methanol refining equipment, which comprises a pre-rectifying tower 1, a negative pressure rectifying tower 2, a pressurizing rectifying tower 3, a normal pressure rectifying tower 4 and a recovery tower 5 which are sequentially connected, wherein the bottom of the pre-rectifying tower 1 is connected with the middle upper part of the negative pressure rectifying tower 2 through a pre-rectifying tower bottom pipeline 38, the bottom of the negative pressure rectifying tower 2 is connected with the middle upper part of the pressurizing rectifying tower 3 through a negative pressure rectifying tower bottom pipeline 39, a pressurizing tower feed preheater 40 is arranged on the negative pressure rectifying tower 2 bottom pipeline 39, the top of the negative pressure rectifying tower 2 is connected with a negative pressure rectifying tower methanol extraction device for extracting methanol, in particular, the negative pressure rectifying tower methanol extraction device comprises a negative pressure rectifying tower top reflux tank 50, the negative pressure rectifying tower top reflux tank 50 is connected with the top of the negative pressure rectifying tower 2 through a negative pressure rectifying tower top extraction pipeline 49, a negative pressure condenser 51 is arranged on the negative pressure rectifying tower top reflux tank 49, the bottom of the negative pressure rectifying tower top reflux tank 50 is connected with a negative pressure rectifying tower methanol extraction pipeline 52 for storing the methanol extraction tank 15 in the rectifying tower 15, and the negative pressure rectifying tower 15 can be used for storing the methanol extraction device in the rectifying tower 15; a negative pressure tower refined methanol extraction pump 53 is arranged on the negative pressure tower refined methanol extraction pipeline 52, a negative pressure tower reflux pipeline 59 is connected to the negative pressure tower refined methanol extraction pipeline 52 at the rear part of the negative pressure tower refined methanol extraction pump 53, and the negative pressure tower reflux pipeline 59 is connected with the middle upper part of the negative pressure rectifying tower 2, so that the purity of refined methanol is improved; preferably, in order to adjust the pressure of the negative pressure rectifying tower 2, a vacuumizing pipeline 54 is arranged at the upper part of the reflux drum 50 at the top of the negative pressure rectifying tower, and a second negative pressure tower condenser 55 and a vacuum pump 56 are sequentially arranged on the vacuumizing pipeline 54; the bottom of the pressurized rectifying tower 3 is connected with the middle upper part of the normal pressure rectifying tower 4 through a pressurized rectifying tower bottom pipeline 41, the pressurized rectifying tower bottom pipeline 41 passes through a pressurized tower feeding preheater 40, materials enter the normal pressure rectifying tower 4 after being preheated, stability is improved, waste water is extracted from the bottom of the normal pressure rectifying tower 4, the normal pressure rectifying tower 4 is connected with the middle upper part of the recovery tower 5 through a normal pressure rectifying tower side outlet pipeline 42, the normal pressure rectifying tower side outlet pipeline 42 is provided with a normal pressure rectifying tower extraction pump 61 on the normal pressure rectifying tower side outlet pipeline, miscellaneous alcohol is extracted from the side line of the recovery tower 5, waste water is extracted from the bottom of the recovery tower 5, the top of the recovery tower 5 is connected with a recovery tower refined methanol extraction device for extracting refined methanol, in particular, the recovery tower refined methanol extraction device comprises a recovery tower reflux tank 44, recovery tower reflux drum 44 is connected with the top of recovery tower 5 through recovery tower top extraction pipeline 43, is equipped with recovery tower top condenser 45 on the recovery tower top extraction pipeline 43, and the bottom of recovery tower reflux drum 44 is connected with recovery tower smart methanol extraction pipeline 48 for the smart methanol in the recovery tower 5 is retrieved, and recovery tower smart methanol extraction pipeline 48 is connected with smart methanol storage device 15, and smart methanol storage device 15 is used for storing the smart methanol of retrieving, be provided with recovery tower pump 47 on the recovery tower smart methanol extraction pipeline 48, be connected with recovery tower reflux pipeline 46 on the recovery tower smart methanol extraction pipeline 48 at recovery tower pump 47 rear portion, recovery tower reflux pipeline 46 is connected with the well upper portion of recovery tower 5, improves smart methanol's purity.
The lower part of the pre-rectifying tower 1 is connected with a pre-rectifying tower reboiler I6 and a pre-rectifying tower reboiler II 7, the lower part of the negative pressure rectifying tower 1 is connected with a negative pressure rectifying tower reboiler I8 and a negative pressure rectifying tower reboiler II 9, the lower parts of the pressurizing rectifying tower 3, the normal pressure rectifying tower 4 and the recycling tower 5 are respectively connected with a pressurizing rectifying tower reboiler 10, a normal pressure rectifying tower reboiler 11 and a recycling tower reboiler 12, wherein the top of the pressurizing rectifying tower 3 is connected with the normal pressure rectifying tower reboiler 11 through a pressurizing rectifying tower extraction pipeline 13, the normal pressure rectifying tower reboiler 11 is connected with a pressurizing rectifying tower methanol extraction device, specifically, the pressurizing rectifying tower reboiler comprises a pressurizing tower top reflux tank 30, the pressurizing tower top reflux tank 30 is connected with the normal pressure rectifying tower 11 through a pressurizing tower heat exchange pipeline 29, the bottom of the pressurizing tower top reflux tank 30 is connected with the middle upper part of the pressurizing rectifying tower 3, the pressurizing tower reflux pipeline 31 is connected with the pressurizing rectifying tower 3 through the pressurizing rectifying tower reboiler I6, the pressurizing tower reflux pipeline 31 is connected with a pressurizing rectifying tower reflux pipeline 31, and the pressurizing rectifying tower reflux pipeline 32 is connected with the pressurizing rectifying tower extraction pipeline 32; the top of the normal pressure rectifying tower 4 is connected with a negative pressure rectifying tower reboiler I8 through a normal pressure rectifying tower extraction pipeline 14, the negative pressure rectifying tower reboiler I8 is connected with a normal pressure rectifying tower refined methanol extraction device for extracting refined methanol in the normal pressure rectifying tower, specifically, the normal pressure rectifying tower refined methanol extraction device comprises a normal pressure tower top reflux tank 17, the normal pressure tower top reflux tank 17 is connected with the negative pressure rectifying tower reboiler I8 through a normal pressure tower heat exchange pipeline 16, the bottom of the normal pressure tower top reflux tank 17 is connected with a normal pressure tower refined methanol extraction pipeline 18 for extracting refined methanol, the normal pressure tower refined methanol extraction pipeline 18 is connected with a refined methanol storage device 15 for storing refined methanol, a normal pressure tower refined methanol extraction pump 19 is arranged on the normal pressure tower refined methanol extraction pipeline 18, a normal pressure tower reflux pipeline 20 is connected with the middle upper part of the normal pressure rectifying tower 4, and the refined methanol extraction pipeline 18 is connected with the normal pressure tower reflux pipeline 20 at the rear part of the normal pressure tower refined methanol extraction pump 19 for improving the extracted concentration of refined methanol.
Preferably, the top of the pre-rectifying tower 1 is connected with a second pre-rectifying tower heat exchange reboiler 7 through a pre-rectifying tower extraction pipeline 21, a heat pump 60 is arranged on the pre-rectifying tower extraction pipeline 21, and the second pre-rectifying tower heat exchange reboiler 7 is connected with the pre-rectifying tower 1 through a pre-rectifying tower reflux device; preferably, the pre-tower reflux device comprises a pre-tower buffer tank 23, the pre-tower buffer tank 23 is connected with a negative pressure rectifying tower reboiler I8 through a pre-rectifying tower heat exchange pipeline 22, a pre-tower top cooler 24 is arranged on the pre-rectifying tower heat exchange pipeline 22, a purge gas discharge pipeline 25 is connected to the top of the pre-tower buffer tank 23, an extraction water pipeline 26 is connected to one side of the pre-tower buffer tank 23, the bottom of the pre-tower buffer tank 23 is connected with the middle upper part of the pre-rectifying tower 1 through a pre-tower reflux pipeline 27, and a pre-tower reflux pump 28 is arranged on the pre-tower reflux pipeline 27.
Preferably, the second pre-rectifying tower reboiler 7, the pressurized rectifying tower reboiler 10 and the recovery tower reboiler 12 respectively supply heat to the second pre-rectifying tower reboiler 7, the pressurized rectifying tower reboiler 10 and the recovery tower reboiler 12 through steam with a steam pipeline 34, the second pre-rectifying tower reboiler 7, the pressurized rectifying tower reboiler 10 and the recovery tower reboiler 12 are respectively connected with a pre-rectifying tower preheater 36 through a steam reflux pipeline 35, the pre-rectifying tower preheater 36 is connected with the middle upper part of the pre-rectifying tower 1 through a feeding pipeline 37, the steam after heat exchange enters the pre-rectifying tower 1 through the feeding pipeline 37, and during feeding, the crude methanol enters the pre-rectifying tower 1 through the feeding pipeline 37 after being heated by the pre-rectifying tower preheater 36, so that the stability is improved.
In this example, a specific application is provided wherein crude methanol is fed at 91.56t/h, wherein the water content is 3.8%, the ethanol content is about 2300ppm, and the crude methanol is preheated to 70-75 ℃ by a pre-tower preheater 36 and then fed to a pre-rectifying tower 1, the operating parameters of each tower are shown in Table 1 below:
TABLE 1
The utility model discloses an adopt five tower four-effect crude methanol refining equipment of follow-on, including prefractionation tower, negative pressure rectifying column, pressurization rectifying column, ordinary pressure rectifying column, recovery tower, adopt thermal coupling and heat pump complex form, concrete as follows:
the pressurizing rectifying tower reboiler 10 adopts a steam heat source, the methanol steam at the top of the pressurizing rectifying tower 3 provides heat for the normal pressure rectifying tower reboiler 11, the methanol steam at the top of the normal pressure rectifying tower 4 provides heat for the negative pressure rectifying tower reboiler I8, the heat pump 60 is added at the top of the pre-rectifying tower 1, the heat is provided for the pre-rectifying tower reboiler II 7 after the pressure at the top of the pre-rectifying tower 1 is increased in temperature, and the deficient part supplements the pre-rectifying tower reboiler I6 by utilizing the steam condensate at the top of the pressurizing rectifying tower 3, so that the energy consumption of each ton of refined methanol is about 0.5t of steam.
In summary, by adopting the technical scheme, for the stock market, the purposes of expanding more than 30% and reducing the steam consumption by 45% -50% in the traditional three-tower methanol rectification (forward-flow double-effect rectification) process can be realized; for the newly added market, the investment is small, the operability is strong, and energy-saving measures such as optimizing heat recycling by adopting a heat exchange network are adopted, so that the steam consumption is greatly reduced, and the consumption of each ton of methanol can be reduced to below 0.5 ton of steam per ton of refined methanol.
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 (9)
1. The utility model provides a five-tower four-effect crude methanol refining equipment which is characterized in that, including prefractionation tower (1), negative pressure rectifying tower (2), pressurization rectifying tower (3), normal pressure rectifying tower (4), recovery tower (5) that connect gradually, the lower part of prefractionation tower (1) is connected with prefractionation tower reboiler one (6) and prefractionation tower reboiler two (7), the lower part of negative pressure rectifying tower (2) is connected with negative pressure rectifying tower reboiler one (8) and negative pressure rectifying tower reboiler two (9), pressurization rectifying tower (3), normal pressure rectifying tower (4), the lower part of recovery tower (5) are connected with pressurization rectifying tower reboiler (10), normal pressure rectifying tower reboiler (11), recovery tower reboiler (12) respectively, wherein, the top of pressurization rectifying tower (3) is connected with normal pressure rectifying tower reboiler (11) through pressurization rectifying tower extraction pipeline (13), and normal pressure rectifying tower reboiler (4) are connected with normal pressure rectifying tower methanol extraction device through pre-rectifying tower (8) extraction pipeline one (21) and normal pressure rectifying tower reboiler one (7) are connected with normal pressure rectifying tower extraction device (8), the pre-rectifying tower extraction pipeline (21) is provided with a heat pump (60), the top of the negative pressure rectifying tower (2) is connected with a negative pressure rectifying tower refined methanol extraction device, and the top of the recovery tower (5) is connected with a recovery tower refined methanol extraction device.
2. The five-tower four-effect crude methanol refining device according to claim 1, wherein the pressurizing rectifying tower refined methanol extraction device comprises a pressurizing tower top reflux tank (30), the pressurizing tower top reflux tank (30) is connected with an atmospheric rectifying tower reboiler (11) through a pressurizing tower heat exchange pipeline (29), the bottom of the pressurizing tower top reflux tank (30) is connected with the middle upper part of the pressurizing rectifying tower (3) through a pressurizing tower reflux pipeline (31), the pressurizing tower reflux pipeline (31) passes through a pre-rectifying tower reboiler I (6), a pressurizing tower reflux pump (33) is arranged on the pressurizing tower reflux pipeline (31), and the pressurizing tower reflux pipeline (31) is further connected with a pressurizing tower refined methanol extraction pipeline (32).
3. The five-tower four-effect crude methanol refining device according to claim 1, wherein the normal pressure rectifying tower refined methanol extracting device comprises a normal pressure tower top reflux tank (17), the normal pressure tower top reflux tank (17) is connected with a negative pressure rectifying tower reboiler I (8) through a normal pressure tower heat exchange pipeline (16), the bottom of the normal pressure tower top reflux tank (17) is connected with a normal pressure tower refined methanol extracting pipeline (18), the normal pressure tower refined methanol extracting pipeline (18) is provided with a normal pressure tower refined methanol extracting pump (19), the normal pressure tower refined methanol extracting pipeline (18) at the rear part of the normal pressure tower refined methanol extracting pump (19) is connected with a normal pressure tower reflux pipeline (20), and the normal pressure tower reflux pipeline (20) is connected with the middle upper part of the normal pressure rectifying tower (4).
4. The five-tower four-effect crude methanol refining device according to claim 1, wherein the negative pressure rectifying tower refined methanol extracting device comprises a negative pressure tower top reflux tank (50), the negative pressure tower top reflux tank (50) is connected with the top of a negative pressure rectifying tower (2) through a negative pressure rectifying tower top extracting pipeline (49), a negative pressure tower condenser (51) is arranged on the negative pressure rectifying tower top extracting pipeline (49), a negative pressure tower refined methanol extracting pipeline (52) is connected to the bottom of the negative pressure tower top reflux tank (50), a negative pressure tower refined methanol extracting pump (53) is arranged on the negative pressure tower refined methanol extracting pipeline (52), a negative pressure tower reflux pipeline (59) is connected to the negative pressure tower refined methanol extracting pipeline (52) at the rear part of the negative pressure tower refined methanol extracting pump (53), and the negative pressure tower reflux pipeline (59) is connected with the middle upper part of the negative pressure rectifying tower (2).
5. The five-tower four-effect crude methanol refining device according to claim 4, wherein a vacuum pipeline (54) is arranged at the upper part of the reflux drum (50) at the top of the negative pressure tower, and a negative pressure tower condenser II (55) and a vacuum pump (56) are sequentially arranged on the vacuum pipeline (54).
6. The five-tower four-effect crude methanol refining device according to claim 1, wherein the recovery tower refined methanol extraction device comprises a recovery tower reflux tank (44), the recovery tower reflux tank (44) is connected with the top of the recovery tower (5) through a recovery tower top extraction pipeline (43), a recovery tower top condenser (45) is arranged on the recovery tower top extraction pipeline (43), the bottom of the recovery tower reflux tank (44) is connected with a recovery tower refined methanol extraction pipeline (48), a recovery tower pump (47) is arranged on the recovery tower refined methanol extraction pipeline (48), a recovery tower reflux pipeline (46) is connected on the recovery tower refined methanol extraction pipeline (48) at the rear part of the recovery tower pump (47), and the recovery tower reflux pipeline (46) is connected with the middle upper part of the recovery tower (5).
7. The five-tower four-effect crude methanol refining device according to claim 1, wherein the pre-rectifying tower reboiler two (7) is connected with the pre-rectifying tower (1) through a pre-rectifying tower reflux device, the pre-rectifying tower reflux device comprises a pre-rectifying tower buffer tank (23), the pre-rectifying tower buffer tank (23) is connected with the pre-rectifying tower reboiler two (7) through a pre-rectifying tower heat exchange pipeline (22), a purge gas discharge pipeline (25) is connected to the top of the pre-rectifying tower buffer tank (23), an extraction water pipeline (26) is connected to one side of the pre-rectifying tower buffer tank (23), and the bottom of the pre-rectifying tower buffer tank (23) is connected with the pre-rectifying tower (1) through a pre-rectifying tower reflux pipeline (27).
8. The five-tower four-effect crude methanol refining device according to claim 1, wherein the negative pressure rectifying tower reboiler two (9), the pressurizing rectifying tower reboiler (10) and the recycling tower reboiler (12) are respectively connected with a steam pipeline (34), and the negative pressure rectifying tower reboiler two (9), the pressurizing rectifying tower reboiler (10) and the recycling tower reboiler (12) are respectively connected with a pre-tower preheater (36) through a steam reflux pipeline (35).
9. A five-column four-effect crude methanol refining apparatus as claimed in claim 8, characterized in that the pre-column preheater (36) is connected to the pre-rectification column (1) via a feed line (37).
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| CN202321881308.2U CN220404868U (en) | 2023-07-18 | 2023-07-18 | Five-tower four-effect crude methanol refining equipment |
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| CN202321881308.2U CN220404868U (en) | 2023-07-18 | 2023-07-18 | Five-tower four-effect crude methanol refining equipment |
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