CN212894507U - Methanol gas recycling system - Google Patents
Methanol gas recycling system Download PDFInfo
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- CN212894507U CN212894507U CN202021785867.XU CN202021785867U CN212894507U CN 212894507 U CN212894507 U CN 212894507U CN 202021785867 U CN202021785867 U CN 202021785867U CN 212894507 U CN212894507 U CN 212894507U
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Abstract
The utility model relates to the technical field of chemical methanol recovery, in particular to a methanol gas recycling system; the methanol separation washing tower is characterized by comprising a plurality of methanol flash tanks, a flash gas washing tower and two washing circulating pumps, wherein each methanol flash tank is communicated with a methanol separation washing tower corresponding to the tail end of a methanol synthesis line, each methanol flash tank is connected with a flash gas pipeline, the flash gas pipelines on the methanol flash tanks are connected in parallel and then connected with the flash gas washing tower, liquid outlet ends of the two washing circulating pumps are connected with liquid phase circulating pipes, and the two liquid phase circulating pipes are connected in parallel and then divided into two liquid phase circulating branch pipes; the whole set of recovery system of the utility model can simultaneously realize the recovery of methanol gas from crude methanol in a plurality of methanol synthesis lines; meanwhile, a liquid outlet end pipeline of the washing pump is connected in parallel and then divided into two paths, one path returns to a liquid phase inlet of the flash gas washing tower, and the other path returns to the methanol flash tank, so that the effect of circular washing is achieved, and the consumption of desalted water is effectively reduced.
Description
Technical Field
The utility model relates to a chemical industry methyl alcohol retrieves technical field, concretely relates to gaseous recycle system of methyl alcohol.
Background
In the coal chemical industry process for synthesizing methanol from coal gas, crude methanol generated by a methanol separation washing tower enters a methanol flash evaporation tank for pressure reduction and flash evaporation, and flash evaporation gas after pressure reduction and flash evaporation in the methanol flash evaporation tank is generally directly discharged, which not only causes resource waste, but also pollutes the environment.
The utility model with the patent number of CN210885869U discloses a methanol synthesis flash evaporation gas recovery device, which comprises a methanol flash evaporation tank, a flash evaporation gas washing tower and a methanol rectification device, wherein a crude methanol pipe is arranged at the inlet of the methanol flash evaporation tank, a crude methanol product pipe is arranged at the outlet of the methanol flash evaporation tank, and the outlet at the top of the methanol flash evaporation tank is connected with the inlet of the flash evaporation gas washing tower; the upper inlet of the flash gas washing tower is provided with a desalting water pipe, the outlet at the top end of the flash gas washing tower is connected with a fuel gas pipe network, and the flare pipe network is connected to the fuel gas pipe network; the outlet at the bottom end of the flash gas washing tower is connected with a methanol rectifying device. Still like the utility model discloses a patent number CN 208776602U's utility model also discloses a flash distillation gas recovery methyl alcohol system, including the preheater, the flash tank, the desalination water pond, rectifying system underground tank and flash distillation gas recovery tower, the flash tank is connected to the speed of preheater air inlet through valve III, valve III front end is connected to the lower extreme inlet end of flash distillation gas recovery tower through valve I, flash distillation gas recovery tower upper end gas outlet is connected to the rear end of valve III through valve II, the desalination water pond is connected to the inlet of steam recovery tower upper end, the liquid outlet of steam recovery tower lower extreme is connected to rectifying system underground tank. The two device systems for recovering methanol can recover part of methanol in the methanol synthesis process, but have some defects. One, there is not more than one methanol synthesis line in a general chemical plant, and when the two methanol recovery systems disclosed above are used specifically, each methanol synthesis line needs to be equipped with an auxiliary methanol recovery system, and the arrangement of a plurality of methanol recovery systems occupies a large area of plant area; and secondly, the flash evaporation gas washing towers in the two recovered methanol recovery systems are communicated with an external desalted water source through a pipeline, and the external desalted water source needs to be continuously added in the process of washing the flash evaporation gas, so that the dosage of desalted water is greatly increased. Therefore, aiming at the defects of the two methanol recovery device systems, it is a technical problem to be solved to design a methanol gas recovery and utilization system which can simultaneously recover methanol from a plurality of methanol synthesis lines and can reduce the consumption of desalted water in the recovery process.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that to two current methyl alcohol recovery unit systems not enough that point out in the background art, design one kind can carry out methyl alcohol recovery, and can reduce the gaseous recycle system of methyl alcohol of the desalinized water quantity among the recovery process to a plurality of methyl alcohol synthetic threads simultaneously.
The utility model discloses a realize through following technical scheme:
a methanol gas recycling system comprises a plurality of methanol flash tanks, a flash gas washing tower and two washing circulating pumps, wherein each methanol flash tank is communicated with a methanol separation washing tower corresponding to the tail end of a methanol synthesis line, each methanol flash tank is connected with a flash gas pipeline, the flash gas pipelines on the plurality of methanol flash tanks are connected with a gas phase inlet on the flash gas washing tower after being connected with each other in parallel, a gas phase outlet at the upper end of the flash gas washing tower is connected with a tail gas fuel removal tap pipe network, a desalted water tap pipe network is connected to a liquid phase inlet of the flash gas washing tower, a liquid phase pipeline is connected to a liquid phase outlet at the lower end of the flash gas washing tower, the tail end of the liquid phase pipeline is divided into two branch pipes which are connected with the liquid inlet ends of the corresponding washing circulating pumps respectively, and the liquid outlet ends of the two washing circulating pumps are connected with liquid phase circulating pipes, and the two liquid phase circulating pipes are connected in parallel and then divided into two liquid phase circulating branch pipes, one of the liquid phase circulating branch pipes is communicated with one of the methanol flash evaporation tanks, the other liquid phase circulating branch pipe is communicated with a liquid phase inlet of the flash gas washing tower, and a first liquid phase valve is arranged on the liquid phase circulating branch pipe communicated with the liquid phase inlet of the flash gas washing tower.
As a further arrangement of the scheme, 1-4 methanol flash tanks are arranged.
As a further arrangement of the scheme, a first regulating valve is arranged at the part of each flash evaporation gas pipeline in parallel connection.
As a further arrangement of the above scheme, a second regulating valve is arranged on the tail gas fuel removal tap pipe network.
As a further arrangement of the above scheme, a second liquid phase valve is arranged on the desalted water tap network.
As a further arrangement of the scheme, the branch pipes at the tail ends of the liquid phase pipelines and connected with the corresponding washing circulating pumps are respectively provided with a third liquid phase valve, and the parts of the liquid phase circulating pipes which are connected in parallel and in front of each other are respectively provided with a fourth liquid phase valve.
As a further arrangement of the scheme, a fifth liquid phase valve is arranged on a liquid phase circulation branch pipe connected with the methanol flash tank.
Compared with the prior art, the utility model, its beneficial effect is:
1) the utility model discloses a gaseous recycle system of methyl alcohol is through setting up a plurality of methyl alcohol flash tanks, and be linked together every methyl alcohol flash tank and the methyl alcohol separation scrubbing tower that corresponds methyl alcohol synthetic line tail end, be connected with same flash distillation gas scrubbing tower after the flash distillation pipeline on every methyl alcohol flash tank is connected simultaneously, a whole set of recovery system can realize carrying out the gaseous recovery of methyl alcohol to the thick methyl alcohol in a plurality of methyl alcohol synthetic lines simultaneously, it has effectively solved and has need be equipped with the great problem of an auxiliary methyl alcohol recovery system of every methyl alcohol synthetic line among the prior art and has leaded to area.
2) The utility model discloses a two washing circulating pumps that set up, its two washing circulating pumps (one is opened one and is equipped with), go out liquid end pipeline and divide two the tunnel after the parallel connection, return to flash distillation gas washing tower liquid phase import all the way, another way is to the methyl alcohol flash tank in to reach the effect of circulation washing, effectively reduced the quantity of desalted water; in addition, the two washing circulating pumps are arranged in an open-standby mode, so that the problem that the methanol gas cannot be recovered after the washing circulating pumps are in failure can be prevented, even if one washing circulating pump is in failure, the whole methanol recovery system can still normally operate, and the whole set of recovery system is novel in arrangement, excellent in use effect and high in practicability.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a connection diagram of the device of the present invention.
The system comprises a 1-methanol flash tank, a 2-flash gas washing tower, a 3-washing circulating pump, a 101-flash gas pipeline, a 102-first regulating valve, a 201-fuel removal tap pipe network, a 202-second regulating valve, a 203-desalted water tap pipe network, a 204-second liquid phase valve, a 205-liquid phase pipeline, a 206-third liquid phase valve, a 301-liquid phase circulating pipe, a 302-fourth liquid phase valve, a 303-liquid phase circulating branch pipe, a 304-fifth liquid phase valve and a 305-first liquid phase valve.
Detailed Description
In order to make the technical solutions better understood by those skilled in the art, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only partial embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The methanol gas recycling system of the present invention will be described in detail with reference to fig. 1.
The utility model discloses a gaseous recycle system of methyl alcohol, including a plurality of methyl alcohol flash drum 1, a flash gas washing tower 2 and two washing circulating pumps 3, the concrete quantity of its methyl alcohol flash drum can set up between 1 to 4, and concrete needs have drawn two methyl alcohol flash drums 1 in its attached 1 according to the actual methyl alcohol synthetic line quantity decision of chemical plant.
Wherein, every methanol flash tank 1 all is linked together with the methanol separation scrubbing tower (not shown in the figure) that corresponds methanol synthesis line tail end, all is connected with a flash evaporation gas pipeline 101 on every methanol flash tank 1 to flash evaporation gas pipeline 101 on all methanol flash tanks 1 is connected with the gaseous phase import on flash evaporation gas scrubbing tower 2 after parallelly connecting, and the part of every flash evaporation gas pipeline 101 before parallelly connecting all is provided with first governing valve 102 simultaneously.
The gas phase outlet at the upper end of the flash gas washing tower 2 is connected with a tail gas fuel-removing tap water pipe network 201, and a second regulating valve 202 is arranged on the tail gas fuel-removing tap water pipe network 201.
A desalted water running pipe network 203 is connected to a liquid phase inlet of the flash gas washing tower 2, a second liquid phase valve 204 is arranged on the desalted water running pipe network 203, and the end part of the desalted water running pipe network 203 is connected with an external desalted water source (not shown in the figure), specifically, the external desalted water source can be a desalted water tank.
A liquid phase pipeline 205 is connected to a liquid phase outlet at the lower end of the flash gas washing tower 2, the tail end of the liquid phase pipeline 205 is divided into two branch pipes which are respectively connected with the liquid inlet ends of the corresponding washing circulating pumps 3, and third liquid phase valves 206 are arranged on the branch pipes which are connected with the corresponding washing circulating pumps 3 at the tail end of the liquid phase pipeline 205.
Liquid outlet ends of the two washing circulating pumps 3 are both connected with a liquid phase circulating pipe 301, and a fourth liquid phase valve 302 is arranged at the part of the liquid phase circulating pipe 301 which is connected in front of the liquid phase circulating pipe 301. The two liquid phase circulation pipes 301 are connected in parallel and then divided into two liquid phase circulation branch pipes 303, one of the liquid phase circulation branch pipes 303 is communicated with the above-mentioned one of the methanol flash tanks 1, and the fifth liquid phase valve 304 is provided on the liquid phase circulation branch pipe 303, and the other liquid phase circulation branch pipe 303 is communicated with the liquid phase inlet of the flash gas washing column 2, and the first liquid phase valve 305 is provided on the liquid phase circulation branch pipe 303 communicated with the liquid phase inlet of the flash gas washing column 2.
The utility model discloses a gaseous recycle system of methyl alcohol is as follows at the technology when carrying out concrete recovery to methyl alcohol:
1) crude methanol generated by the methanol separation washing tower at the tail end of each methanol synthesis line enters a corresponding methanol flash tank for decompression flash evaporation;
2) flash steam generated in the methanol flash tank enters a flash steam washing tower through a flash steam pipeline to further wash methanol steam in the flash steam washing tower, and tail gas enters a fuel-removing tap water pipe network;
3) starting a circulating washing pump to pump the desalted water in the flash gas washing tower into the flash gas washing tower again to wash the flash gas, so that the desalted water is recycled;
4) when the desalted water is recycled, the diluted alcohol water generated by washing the desalted water reaches a certain concentration, the diluted alcohol water is intermittently pumped into one methanol flash tank by a washing circulating pump to be continuously decompressed and flashed, and finally the diluted alcohol water is sent to a methanol refining unit.
The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modifications, equivalents, improvements and the like made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.
Claims (7)
1. A methanol gas recycling system is characterized by comprising a plurality of methanol flash tanks, a flash gas washing tower and two washing circulating pumps, wherein each methanol flash tank is communicated with a methanol separation washing tower corresponding to the tail end of a methanol synthesis line, each methanol flash tank is connected with a flash gas pipeline, the flash gas pipelines on the methanol flash tanks are connected with a gas phase inlet on the flash gas washing tower in parallel and then are connected with a gas phase inlet on the flash gas washing tower, a gas phase outlet at the upper end of the flash gas washing tower is connected with a tail gas fuel removal tap water pipe network, a desalted water tap water pipe network is connected with a liquid phase inlet on the liquid phase inlet of the flash gas washing tower, a liquid phase pipeline is connected with a liquid phase outlet at the lower end of the flash gas washing tower, the tail end of the liquid phase pipeline is divided into two branch pipes which are respectively connected with the liquid inlet ends of the corresponding washing circulating pumps, and the liquid outlet ends of the, and the two liquid phase circulating pipes are connected in parallel and then divided into two liquid phase circulating branch pipes, one of the liquid phase circulating branch pipes is communicated with one of the methanol flash evaporation tanks, the other liquid phase circulating branch pipe is communicated with a liquid phase inlet of the flash gas washing tower, and a first liquid phase valve is arranged on the liquid phase circulating branch pipe communicated with the liquid phase inlet of the flash gas washing tower.
2. The methanol gas recycling system according to claim 1, characterized in that: the number of the methanol flash tanks is 1-4.
3. The methanol gas recycling system according to claim 1, characterized in that: and the part of each flash evaporation gas pipeline in front of the flash evaporation gas pipeline in parallel connection is provided with a first regulating valve.
4. The methanol gas recycling system according to claim 1, characterized in that: and a second regulating valve is arranged on the tail gas fuel removal tap pipe network.
5. The methanol gas recycling system according to claim 1, characterized in that: and a second liquid phase valve is arranged on the desalted water tap network.
6. The methanol gas recycling system according to claim 1, characterized in that: and branch pipes at the tail ends of the liquid phase pipelines and connected with corresponding washing circulating pumps are respectively provided with a third liquid phase valve, and the parts in parallel connection and in front of the liquid phase circulating pipes are respectively provided with a fourth liquid phase valve.
7. The methanol gas recycling system according to claim 1, characterized in that: and a fifth liquid phase valve is arranged on the liquid phase circulating branch pipe connected with the methanol flash tank.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021785867.XU CN212894507U (en) | 2020-08-25 | 2020-08-25 | Methanol gas recycling system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021785867.XU CN212894507U (en) | 2020-08-25 | 2020-08-25 | Methanol gas recycling system |
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| CN212894507U true CN212894507U (en) | 2021-04-06 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113577991A (en) * | 2021-06-29 | 2021-11-02 | 山东联盟化工股份有限公司 | Method for reducing content of methylene diurea in urea product |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113577991A (en) * | 2021-06-29 | 2021-11-02 | 山东联盟化工股份有限公司 | Method for reducing content of methylene diurea in urea product |
| CN113577991B (en) * | 2021-06-29 | 2023-03-21 | 山东联盟化工股份有限公司 | Method for reducing content of methylene diurea in urea product |
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