CN209952261U

CN209952261U - Methanol three-tower rectifying device

Info

Publication number: CN209952261U
Application number: CN201920595706.5U
Authority: CN
Inventors: 李建刚
Original assignee: Anhui Huaertai Chemical Industry Co Ltd
Current assignee: Anhui Huaertai Chemical Industry Co Ltd
Priority date: 2019-04-28
Filing date: 2019-04-28
Publication date: 2020-01-17
Anticipated expiration: 2029-04-28

Abstract

The utility model relates to a methanol three-tower rectifying device, which comprises a pre-rectifying tower, a pressurizing rectifying tower and a normal pressure rectifying tower, wherein the top parts of the pre-rectifying tower, the pressurizing rectifying tower and the normal pressure rectifying tower are respectively communicated with a pre-tower condenser, a pressurizing tower condenser and a normal pressure tower condenser through discharge pipes, and the top parts of the pre-tower condenser, the pressurizing tower condenser and the normal pressure tower condenser are respectively communicated with a waste heat recovery water tank through heat exchange pipes, the utility model has the advantages of simple structure, stability and reliability, convenient operation, high heat source utilization rate, capability of stirring in the alkali liquor conveying process, capability of keeping the activity and alkalinity of alkali liquor, accurate alkali liquor conveying amount, capability of quickly and stably reaching the standard acid value in crude methanol, capability of quickly recovering the condensate of the pre-rectifying tower, capability of reducing the fluctuation caused by accumulation of the condensate, capability of ensuring stable technological operation, and capability of preventing methanol, the heat generated during condensation of the three towers can be recovered, the energy waste is avoided, and the method has a wide application prospect.

Description

Methanol three-tower rectifying device

Technical Field

The utility model relates to a methanol production technical field specifically is a methanol three-tower rectifier unit.

Background

Methanol is an important chemical raw material, the task of rectifying the methanol is to remove light components such as dimethyl ether and the like in crude methanol and other heavy components such as water, ethanol and the like to produce high-purity rectified methanol, three towers in the rectification of the methanol are a pre-rectifying tower, a pressurized rectifying tower and an atmospheric rectifying tower, the existing three-tower rectifying device of the methanol is designed to add sodium hydroxide alkali liquor with the concentration of 3-5% on a feeding pipeline of the crude methanol before the crude methanol is fed into the pre-rectifying tower so as to achieve the purposes of neutralizing low boiling point and high boiling point acids in the crude methanol and preventing the corrosion of rectifying equipment and pipelines, but because the alkali liquor is deposited, the activity and the alkalinity of the alkali liquor are reduced and the neutralizing effect is influenced, in the rectifying process of the methanol, the light components in the crude methanol are evaporated in the pre-rectifying tower and are discharged into the atmosphere through a condenser at the top of the pre-rectifying tower, the condensed liquid of the methanol is stored at an emptying valve, cause the pre-rectifying tower can not in time empty air easily, cause the tower pressure fluctuation, when the condensate was broken through to methyl alcohol steam, the velocity of flow was too big to take the condensate out, can spray at the scene, caused extravagant resource to the polluted environment, the heat that produces when not condensing methyl alcohol steam in addition carries out effectual recovery, has caused the waste of the energy like this, so, how to design a three tower rectifier unit of methyl alcohol, become the problem that we will solve at present.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a methanol three-tower rectifying device, simple structure, it is reliable and stable, the operation is convenient, the heat source utilization rate is high, through being equipped with the agitator on the alkali lye holding tank, can stir in alkali lye transportation process, can keep the activity and the basicity of alkali lye, through the setting of the dosing pump of adding alkali, the alkali lye volume is accurately transported, make the rapid stabilization of acid value in the thick methanol reach the standard, through the setting of guide shower valve and molecular sieve adsorption column, can retrieve the condensate of pre-rectifying tower fast, the fluctuation of pre-rectifying tower pressure because the condensate accumulates because of having reduced, the process operation is ensured to be stable, prevent methanol from taking place the scene to spray simultaneously, through in pre-rectifying tower, pressurized rectifying tower and atmospheric pressure rectifying tower top all communicate there is the condenser, can retrieve the heat when three-tower condenses, the inside preheating water of waste heat recovery water tank is effectively transmitted, the waste of the energy is avoided, and the waste of methanol and water is avoided in the condensate recovery tower by arranging the condensate reflux groove so as to solve the problem in the background technology.

In order to solve the technical problem, the utility model provides a following technical scheme:

the utility model provides a methanol three-tower rectifying device, includes pre-rectifying tower, pressurization rectifying tower and atmospheric pressure rectifying tower, pre-rectifying tower, pressurization rectifying tower and atmospheric pressure rectifying tower top have pre-tower condenser, pressurization tower condenser and atmospheric pressure tower condenser through the discharging pipe intercommunication respectively, pre-tower condenser, pressurization tower condenser and atmospheric pressure tower condenser top have the waste heat recovery water tank through hot exchange tube intercommunication respectively, just waste heat recovery water tank top is connected with the hot water conveyer pipe, pre-rectifying tower one side intercommunication has crude formaldehyde pan feeding pipe and alkali lye to add the pipe, alkali lye adds the intraductal bottom intercommunication and has the alkali lye holding tank, just the alkali lye is provided with the alkali dosing pump on adding the pipe, pre-tower condenser one side is connected with the blow-down pipe, blow-down pipe one side is connected with two curtain valves, there is molecular sieve adsorption column guide valve bottom through pipe connection, the molecular sieve adsorption column outside is equipped with the alcohol sediment holding tank, the bottom of the alcohol residue storage tank is connected with a material-beating pump through a conduit, the bottom of the pre-rectifying tower is respectively communicated with a preheater and a first reboiler, one side of the first reboiler is communicated with a feeding pump, the preheater and the feeding pump are both communicated on the pressurized rectifying tower, one side of the atmospheric rectifying tower is communicated with a second reboiler, the bottom of the second reboiler is communicated on the top of the pressurized rectifying tower through a rectifying reflux groove, the tower top liquid outlet of the pressurized rectifying tower is connected with a second reboiler, the discharge outlets of the pre-rectifying tower and the pressurized rectifying tower are communicated with the feed inlet of the atmospheric rectifying tower through an atmospheric rectifying pipe, the top of the atmospheric rectifying tower is communicated with a refined methanol condenser, and the bottom end of the refined methanol condenser is connected with a refined methanol collecting tank through a guide pipe, and the bottoms of the pre-rectifying tower, the pressurized rectifying tower and the atmospheric rectifying tower are connected with a kettle bottom liquid collecting tank through a kettle bottom liquid discharging pipe.

Furthermore, the pre-rectifying tower, the pressurized rectifying tower and the atmospheric rectifying tower are internally provided with tower plates which are arranged in a staggered and inclined mode.

Further, the bottoms of the pre-tower condenser, the pressurized tower condenser and the atmospheric tower condenser are respectively communicated with one side of the tops of the pre-rectifying tower, the pressurized rectifying tower and the atmospheric rectifying tower through condensate reflux grooves.

Further, a heat insulation layer is arranged on the inner side of the waste heat recovery water tank.

Furthermore, a crude formaldehyde preheating pipe is arranged around the outer side of the crude formaldehyde feeding pipe, and the crude formaldehyde preheating pipe is spirally distributed.

Further, a stirrer is arranged at the top of the lye storage tank.

Further, the bottom of the normal pressure rectifying tower is communicated with a fusel oil storage tank.

Compared with the prior art, the beneficial effects of the utility model are that: the methanol three-tower rectifying device has the advantages of simple structure, stability, reliability, convenient operation and high heat source utilization rate, can be stirred in the alkali liquor conveying process by arranging the stirrer on the alkali liquor storage tank, can keep the activity and alkalinity of the alkali liquor, can accurately convey the alkali liquor amount by arranging the alkali adding metering pump, ensures that the acid value in crude methanol quickly and stably reaches the standard, can quickly recover the condensate of the pre-rectifying tower by arranging the guide valve and the molecular sieve adsorption column, reduces the fluctuation of the pre-rectifying tower due to the accumulation of the condensate, ensures the stable process operation, prevents the methanol from being sprayed on site, avoids the waste of the methanol and the water, is convenient to recover alcohol residues by arranging the material pumping pump, is communicated with the condensers at the tops of the pre-rectifying tower, the pressurizing rectifying tower and the normal pressure rectifying tower, and can recover the heat generated during the condensation of the three towers, effectual transmission has avoided the waste of the energy for the inside preheating water of waste heat recovery water tank, through the setting of condensate backwash tank, can be so that in the condensate recovery tower, avoid the waste of methyl alcohol and water, so this kind of three tower rectifier units of methyl alcohol have wide application market.

Drawings

The accompanying drawings are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention, and together with the description serve to explain the invention and not to limit the invention.

Fig. 1 is a schematic view of the overall structure of the present invention;

FIG. 2 is a schematic diagram of the internal structure of the pre-rectifying tower of the present invention;

FIG. 3 is a schematic structural view of the lye storage tank of the present invention;

FIG. 4 is a schematic view of the structure of the crude formaldehyde feeding pipe of the present invention;

reference numbers in the figures: 1. a pre-rectifying tower; 2. a pressurized rectifying tower; 3. a normal pressure rectifying tower; 4. a pre-tower condenser; 5. a pressurized column condenser; 6. a normal pressure tower condenser; 7. a heat exchange tube; 8. a waste heat recovery water tank; 9. a hot water delivery pipe; 10. feeding a crude formaldehyde into a pipe; 11. an alkali liquor addition pipe; 12. an alkali liquor storage tank; 13. adding an alkali metering pump; 14. an emptying pipe; 15. a pilot shower valve; 16. a molecular sieve adsorption column; 17. an alcohol residue storage tank; 18. a material-beating pump; 19. a preheater; 20. a first reboiler; 21. a feed pump; 22. a second reboiler; 23. a rectification reflux tank; 24. a normal pressure rectifying pipe; 25. a refined methanol condenser; 26. a refined methanol collecting tank; 27. a kettle bottom liquid discharge pipe; 28. a kettle bottom liquid collecting tank; 29. a column plate; 30. a condensate reflux tank; 31. a crude formaldehyde preheating pipe; 32. a stirrer; 33. fusel oil storage tank.

Detailed Description

The embodiments of the present invention will be described with reference to the accompanying drawings, and it should be understood that the embodiments described herein are merely for purposes of illustration and explanation and are not intended to limit the invention.

As shown in fig. 1-4, the utility model provides a technical solution: the utility model provides a methanol three-tower rectifying device, includes rectifying column 1 in advance, pressurization rectifying column 2 and atmospheric pressure rectifying column 3, rectifying column 1 in advance, pressurization rectifying column 2 and atmospheric pressure rectifying column 3 top have in advance tower condenser 4, pressurization tower condenser 5 and atmospheric pressure tower condenser 6 through the discharging pipe intercommunication respectively for the condensation of formaldehyde steam, there is waste heat recovery water tank 8 in advance tower condenser 4, pressurization tower condenser 5 and atmospheric pressure tower condenser 6 top through hot exchange tube 7 intercommunication respectively, can effectually transmit the inside preheating water for waste heat recovery water tank 8, just waste heat recovery water tank 8 top is connected with hot

water conveyer pipe

9, 1 one side intercommunication of rectifying column in advance has thick formaldehyde pan feeding pipe 10 and alkali lye to add pipe 11, the addition of the thick formaldehyde of being convenient for and alkali lye, 11 bottom intercommunication of alkali lye addition pipe has alkali lye holding tank 12, just the alkali lye is provided with alkali lye dosing pump 13 on the addition pipe 11, the method is characterized in that the amount of alkali liquor is accurately conveyed, so that the acid value in crude methanol quickly and stably reaches the standard, one side of a pre-tower condenser 4 is connected with an air release pipe 14, one side of the air release pipe 14 is connected with two guide shower valves 15, so that the methanol condensate is prevented from being stored at the air release valve, the bottom ends of the guide shower valves 15 are connected with a molecular sieve adsorption column 16 through guide pipes for quickly adsorbing the methanol condensate, the outer side of the molecular sieve adsorption column 16 is provided with an alcohol residue storage tank 17, the bottom of the alcohol residue storage tank 17 is connected with a material pumping pump 18 through guide pipes, so that alcohol residues are conveniently discharged, the bottom of a pre-rectifying tower 1 is respectively communicated with a pre-heater 19 and a first re-boiler 20, one side of the first re-boiler 20 is communicated with a material feeding pump 21, the pre-heater 19 and the material feeding pump 21 are both communicated with a pressure rectifying tower 2, so that formaldehyde with lower purity is conveyed into the pressure, the bottom of the second reboiler 22 is communicated with the top of the pressurized rectifying tower 2 through a rectifying reflux groove 23, a tower top liquid outlet of the pressurized rectifying tower 2 is connected with the second reboiler 22, and a part of formaldehyde flows back through heat exchange between the first reboiler 20 and the second reboiler 22, discharge ports of the pre-rectifying tower 1 and the pressurized rectifying tower 2 are communicated with a feed port of the atmospheric rectifying tower 3 through an atmospheric rectifying pipe 24 and are used for conveying formaldehyde with higher purity in the pre-rectifying tower 1 and the pressurized rectifying tower 2 into the atmospheric rectifying tower 3 for further rectifying and purifying, the top of the atmospheric rectifying tower 3 is communicated with a rectifying methanol condenser 25, the bottom end of the rectifying methanol condenser 25 is connected with a rectifying methanol collecting tank 26 through a conduit and is used for collecting high-purity formaldehyde, and bottoms of the pre-rectifying tower 1, the pressurized rectifying tower 2 and the atmospheric rectifying tower 3 are connected with a bottom liquid collecting tank 28 through a bottom liquid discharge pipe 27, is used for collecting the kettle bottom liquid and is convenient to recycle.

More specifically, the pre-rectifying tower 1, the pressurized rectifying tower 2 and the atmospheric rectifying tower 3 are all internally provided with tower plates 29, the tower plates 29 are arranged in a staggered and inclined manner, the contact area of the tower plates 29 can be increased, the rectifying effect can be improved, the bottoms of the pre-tower condenser 4, the pressurized tower condenser 5 and the atmospheric tower condenser 6 are respectively communicated with one side of the tops of the pre-rectifying tower 1, the pressurized rectifying tower 2 and the atmospheric rectifying tower 3 through condensate return grooves 30, the waste of methanol and water can be avoided in a condensate recovery tower, the inner side of the waste heat recovery water tank 8 is provided with a heat insulation layer to reduce the loss of heat, the outer side of the crude formaldehyde feeding pipe 10 is surrounded with a crude formaldehyde preheating pipe 31, the crude formaldehyde preheating pipe 32 is distributed in a spiral manner to prevent the crude formaldehyde from being condensed to cause blockage, the top of the alkali liquor storage tank 12 is provided with a stirrer 32 capable of stirring in the alkali liquor conveying process, the activity and the alkalinity of the alkali liquor can be kept, and the bottom of the atmospheric distillation tower 3 is communicated with a fusel oil storage tank 33 for collecting and processing fusel oil.

The utility model discloses improve in: when the methanol three-tower rectifying device is used, the stirrer 32 is arranged on the alkali liquor storage tank 12, stirring can be carried out in the alkali liquor conveying process, the activity and the alkalinity of the alkali liquor can be kept, the alkali liquor amount can be accurately conveyed through the setting of the alkali adding metering pump 13, the acid value in crude methanol can quickly and stably reach the standard, the guide shower valve 15 is arranged on the vent pipe 14, the methanol condensate is prevented from being accumulated at the vent valve, the condensate of the pre-rectifying tower 1 can be quickly recovered through the setting of the molecular sieve adsorption column 16, the fluctuation of the tower pressure of the pre-rectifying tower 1 caused by the accumulation of the condensate is reduced, the stable process operation is ensured, meanwhile, the methanol is prevented from being sprayed on site, the waste of the methanol and the water is avoided, the alcohol residue is conveniently recovered through the setting of the material pumping pump 18, condensers are communicated with the tops of the pre-rectifying tower 1, the pressurizing rectifying tower 2 and the normal pressure rectifying tower 3, utilize the effect of hot exchange pipe 7, heat when can retrieving the three-tower condensation, the inside preheating water of waste heat recovery water tank 8 is given in effectual transmission, has avoided the waste of the energy, through the setting of condensate return tank 30, can be so that in the condensate recovery tower, improved heat source utilization.

Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications and variations can be made in the embodiments described above, or equivalent substitutions and improvements can be made to some of the technical features of the embodiments described above.

Claims

1. The utility model provides a methanol three-tower rectifying device, includes rectifying column (1), pressurization rectifying column (2) and ordinary pressure rectifying column (3) in advance, its characterized in that: the pre-rectifying tower (1), the pressure rectifying tower (2) and the atmospheric rectifying tower (3) are respectively communicated with a pre-tower condenser (4), a pressure tower condenser (5) and an atmospheric tower condenser (6) through discharge pipes, the pre-tower condenser (4), the pressure tower condenser (5) and the atmospheric tower condenser (6) are respectively communicated with a waste heat recovery water tank (8) through heat exchange pipes (7), the top of the waste heat recovery water tank (8) is connected with a hot water conveying pipe (9), one side of the pre-rectifying tower (1) is communicated with a crude formaldehyde feeding pipe (10) and an alkali liquid feeding pipe (11), the bottom end of the alkali liquid feeding pipe (11) is communicated with an alkali liquid storage tank (12), an alkali liquid feeding pipe (11) is provided with an alkali adding metering pump (13), one side of the pre-tower condenser (4) is connected with an emptying pipe (14), one side of the emptying pipe (14) is connected with two guiding and leaching valves (15), there are molecular sieve adsorption column (16) bottom deflector valve (15) through pipe connection, molecular sieve adsorption column (16) outside is equipped with alcohol residue holding tank (17), just there is pump (18) of beating material bottom alcohol residue holding tank (17) through pipe connection, pre-rectifying column (1) bottom communicates respectively pre-heater (19) and first reboiler (20), first reboiler (20) one side intercommunication has feed pump (21), just pre-heater (19), feed pump (21) all communicate on pressurized rectifying column (2), atmospheric rectifying column (3) one side intercommunication has second reboiler (22), second reboiler (22) bottom is through rectifying tank (23) intercommunication at pressurized rectifying column (2) top, just the top of the tower liquid export of pressurized rectifying column (2) is connected with second reboiler (22), pre-rectifying column (1) and pressurized rectifying column (2)'s discharge gate all communicate at atmospheric rectifying column (22) through atmospheric distillation pipe (24), and the intercommunication is in atmospheric distillation The feed inlet of rectifying column (3), atmospheric distillation column (3) top intercommunication has refined methanol condenser (25), just there is refined methanol collecting vat (26) refined methanol condenser (25) bottom through pipe connection, pre-rectifying column (1), pressurization rectifying column (2) and atmospheric distillation column (3) bottom all are connected with cauldron base liquid collecting vat (28) through cauldron base liquid discharge pipe (27).

2. The methanol three-tower rectifying device according to claim 1, wherein: the pre-rectifying tower (1), the pressurized rectifying tower (2) and the atmospheric rectifying tower (3) are internally provided with tower plates (29), and the tower plates (29) are mutually staggered and obliquely arranged.

3. The methanol three-tower rectifying device according to claim 1, wherein: the bottoms of the pre-tower condenser (4), the pressurized tower condenser (5) and the atmospheric tower condenser (6) are respectively communicated with one side of the tops of the pre-rectifying tower (1), the pressurized rectifying tower (2) and the atmospheric rectifying tower (3) through condensate reflux grooves (30).

4. The methanol three-tower rectifying device according to claim 1, wherein: and a heat insulation layer is arranged on the inner side of the waste heat recovery water tank (8).

5. The methanol three-tower rectifying device according to claim 1, wherein: the outer side of the crude formaldehyde feeding pipe (10) is surrounded with a crude formaldehyde preheating pipe (31), and the crude formaldehyde preheating pipe (31) is spirally distributed.

6. The methanol three-tower rectifying device according to claim 1, wherein: the top of the lye storage tank (12) is provided with a stirrer (32).

7. The methanol three-tower rectifying device according to claim 1, wherein: the bottom of the atmospheric distillation tower (3) is communicated with a fusel oil storage tank (33).