CN213433753U - Low-temperature methanol washing device - Google Patents
Low-temperature methanol washing device Download PDFInfo
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- CN213433753U CN213433753U CN202022216101.6U CN202022216101U CN213433753U CN 213433753 U CN213433753 U CN 213433753U CN 202022216101 U CN202022216101 U CN 202022216101U CN 213433753 U CN213433753 U CN 213433753U
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Abstract
The utility model discloses a device is washed to low temperature methyl alcohol, the device is including the CO who establishes ties in proper order2A reabsorption tower, a separator, a methanol collection device and a thermal regeneration tower. Wherein: CO 22The upper tail gas outlet main pipe of the reabsorption tower is connected with an inlet of a separator, and the separator is used for separating methanol in tail gas; a first outlet of the separator is used for outputting the separated tail gas, the first outlet is connected with a heat exchanger, and the heat exchanger is connected with a tail gas washing tower; a second outlet of the separator is used for outputting the separated methanol, the second outlet is connected with a methanol collecting device, and the methanol collecting device is used for collecting the separated methanol; the thermal regeneration tower is used for treating the separated methanolSulfur content of (a). The low-temperature methanol washing device can reduce the content of methanol in tail gas and obtain methanol with higher purity.
Description
Technical Field
The utility model relates to a chemical industry equipment technical field, in particular to device is washed to low temperature methyl alcohol.
Background
The low-temperature methanol washing process takes cold methanol as an absorption solvent, and removes acid gas in raw material gas by utilizing the excellent characteristic that the methanol has extremely high solubility to the acid gas at low temperature.
In the operation process of the low-temperature methanol washing device, the low-temperature methanol washing device is in a high-load operation state, and part of equipment has design defects (for example, middle section gas outlet is too close to a methanol feed inlet, so that middle section gas outlet carries methanol), the demister shutter has poor effect, and CO is poor in CO2Reabsorption tower for CO2When methanol in the tail gas is removed, the time consumption is long, the removal effect is not obvious, and the content of methanol in the tail gas after removal is still high, namely, CO2Desorption of CO in reabsorption tower2Methanol is seriously carried in the tail gas, so that the methanol consumption is high in the operation process of a system, the operation cost is high, the tail gas emission is not up to the standard due to the overhigh methanol content in the tail gas, and the environmental protection pressure is high.
SUMMERY OF THE UTILITY MODEL
In view of this, the present invention provides a low-temperature methanol washing apparatus, which can reduce the methanol content in the tail gas and obtain methanol with higher purity.
In order to achieve the above object, the utility model provides a following technical scheme:
a low-temperature methanol washing device comprises CO connected in series in sequence2Reabsorption tower, separator, methyl alcohol collection device and heat regeneration tower, wherein:
the CO is2The upper tail gas outlet main pipe of the reabsorption tower is connected with the inlet of the separator, and the separator is used for separating methanol in tail gas;
a first outlet of the separator is used for outputting the separated tail gas, the first outlet is connected with a heat exchanger, and the heat exchanger is connected with a tail gas washing tower;
the second outlet of the separator is used for outputting the separated methanol, the second outlet is connected with the methanol collecting device, and the methanol collecting device is used for collecting the separated methanol;
the thermal regeneration tower is used for treating the sulfur content in the separated methanol.
Optionally, in the low-temperature methanol washing device, the separator is a vertical wire mesh separator.
Optionally, in the above low-temperature methanol washing apparatus, the first outlet is disposed at the top of the separator; the second outlet is disposed at a bottom of the separator.
Optionally, in the low-temperature methanol washing device, the separator is provided with a remote-transmission and on-site liquid level meter and is provided with a corresponding liquid level regulating valve group.
Optionally, in the low-temperature methanol washing device, the liquid level regulating valve group (22) is arranged on a first connecting pipeline between the separator and the methanol collecting device.
Optionally, in the low-temperature methanol washing device, one end of the first connecting pipeline is connected to the bottom port of the separator, and the other end of the first connecting pipeline is connected to the top port of the methanol collecting device.
Optionally, in the low-temperature methanol washing device, the methanol collecting device and the thermal regeneration tower are connected through a second connecting pipeline, and a submerged pump is arranged on the second connecting pipeline.
Optionally, in the low-temperature methanol washing device, the methanol collecting device includes a horizontal tank and a bottom groove, and one end of the second connecting pipeline extends into the bottom groove.
Optionally, in the low-temperature methanol washing device, two heat exchangers are arranged and are arranged in parallel.
According to the above technical scheme, the utility model provides a device is washed to low temperature methyl alcohol at CO2The reabsorption tower 1 is connected with the separator 2, and the temperature of the tail gas is-40 ℃ to-55 ℃ (such as-47 ℃), so that the methanol in the tail gas can be separated by using a low-temperature separation technology, the methanol content in the tail gas is greatly reduced, the methanol with higher purity is obtained by recovery and separation, the production cost and the operation cost are reduced, the problem that the methanol discharged by the tail gas exceeds the standard is solved, and the environmental protection pressure is reduced.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a low-temperature methanol washing device provided by the embodiment of the present invention.
Wherein:
1-CO2a reabsorption tower, a 2-separator, a 3-methanol collecting device, a 4-thermal regeneration tower, a 5-submerged pump,
21-remote and local level meter, 22-liquid level regulating valve group.
Detailed Description
The embodiment of the utility model discloses device is washed to low temperature methyl alcohol can reduce the methyl alcohol content in the tail gas to obtain the higher methyl alcohol of purity.
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a low-temperature methanol washing apparatus according to an embodiment of the present invention.
The embodiment of the utility model provides a device is washed to low temperature methyl alcohol, including the CO who establishes ties in proper order2Reabsorption tower 1, separator 2, methanol collection device 3 and thermal regeneration tower 4, wherein:
CO2an upper tail gas outlet header pipe (500-COO-15001-A3K-C) of the reabsorption tower 1 is connected with an inlet of a separator 2, and the separator 2 is used for separating methanol in tail gas;
a first outlet of the separator 2 is used for outputting the separated tail gas, and the first outlet is connected with a heat exchanger which is connected with a tail gas washing tower;
a second outlet of the separator 2 is used for outputting the separated methanol, the second outlet is connected with a methanol collecting device 3, and the methanol collecting device 3 is used for collecting the separated methanol;
the thermal regeneration column 4 is used to treat the sulfur content of the separated methanol.
In particular, CO2The reabsorption tower 1 functions as: methanol solution at low pressure to liberate CO2Scrubbing CO with methanol delivered by a medium pressure flash column2H in gas2And S. The separator 2 functions as: in the process of cooling or pressurizing saturated gas, a part of condensable gas components can form small droplets to flow together with the gas, and the gas-liquid separator is used for treating the gas containing a small amount of condensate to realize condensate recovery or gas phase purification.
It can be seen that the embodiment of the utility model provides a device is washed to low temperature methyl alcohol at CO2The reabsorption tower 1 is followed by a separator 2 where the temperature of the off-gas is in the range-40 ℃ to-55 ℃ (e.g. -47 ℃), enabling separation of the off-gas using cryogenic separation techniquesThe methanol greatly reduces the content of methanol in the tail gas, recovers and separates the methanol with higher purity, reduces the production cost and the operation cost, solves the problem that the methanol discharged from the tail gas exceeds the standard, and lightens the pressure of environmental protection.
In particular, the separator 2 is a vertical wire mesh separator, with a first outlet disposed at the top of the separator 2 and a second outlet disposed at the bottom of the separator 2. Moreover, the separator 2 is also provided with a remote transmission and on-site liquid level meter 21 and a corresponding liquid level regulating valve group 22, so that the liquid level is conveniently controlled and automatic control is realized.
Specifically, the liquid level regulating valve group 22 is disposed on a first connecting pipeline between the separator 2 and the methanol collecting device 3, one end of the first connecting pipeline is connected to the bottom port of the separator 2, and the other end of the first connecting pipeline is connected to the top port of the methanol collecting device 3.
Specifically, the specification id (mm) xL (T-T, mm) of the vertical wire mesh separator is: phi 2800 x 4000, the main material is S30408 (a common stainless steel material, equivalent to 06Cr19Ni10 in GB standard of China), the net weight of the equipment is about 7 tons, the temperature of the tail gas is between-40 ℃ and-55 ℃ (for example, -47 ℃), and the methanol in the tail gas can be separated by using a low-temperature separation technology.
Specifically, the methanol collection device 3 and the thermal regeneration tower 4 are connected through a second connecting pipeline, and a submerged pump 5 is arranged on the second connecting pipeline.
Specifically, the methanol collecting device 3 comprises a transverse tank body and a bottom groove, and one end of the second connecting pipeline extends into the bottom groove.
In the production process, CO2The tail gas output by the reabsorption tower 1 enters a separator 2, the methanol separated from the separator 2 is sent to a methanol collection device 3 through a liquid level regulating valve group 22, and then is pumped to a thermal regeneration tower 4 through a submerged pump 5 to treat the sulfur content in the methanol, so that the purposes of recovering the methanol, saving energy and reducing consumption are finally achieved.
Specifically, in the low-temperature methanol washing device, the first outlet of the separator 2 is connected with two heat exchangers arranged in parallel, and the outlets of the two heat exchangers arranged in parallel are connected with the tail gas washing tower.
Finally, it should also be noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (9)
1. The low-temperature methanol washing device is characterized by comprising CO connected in series in sequence2A reabsorption column (1), a separator (2), a methanol collection device (3) and a thermal regeneration column (4), wherein:
the CO is2The upper tail gas outlet main pipe of the reabsorption tower (1) is connected with the inlet of the separator (2), and the separator (2) is used for separating methanol in tail gas;
a first outlet of the separator (2) is used for outputting the separated tail gas, the first outlet is connected with a heat exchanger, and the heat exchanger is connected with a tail gas washing tower;
a second outlet of the separator (2) is used for outputting the separated methanol, the second outlet is connected with the methanol collecting device (3), and the methanol collecting device (3) is used for collecting the separated methanol;
the thermal regeneration tower (4) is used for treating the sulfur content in the separated methanol.
2. A cryogenic methanol washing plant according to claim 1, characterized in that the separator (2) is a vertical wire mesh separator.
3. A cryogenic methanol washing plant according to claim 2, characterized in that the first outlet is arranged at the top of the separator (2);
the second outlet is arranged at the bottom of the separator (2).
4. A cryogenic methanol washing plant according to claim 2, characterized in that the separator (2) is provided with remote and on-site level gauges (21) and is equipped with corresponding level regulating valve banks (22).
5. A cryogenic methanol washing plant according to claim 4, characterized in that the level regulating valve block (22) is arranged on a first connection line between the separator (2) and the methanol collection device (3).
6. A low-temperature methanol washing device according to claim 5, characterized in that one end of the first connecting pipeline is connected with the bottom port of the separator (2), and the other end is connected with the top port of the methanol collecting device (3).
7. A low-temperature methanol washing device according to claim 1, characterized in that the methanol collection device (3) and the thermal regeneration tower (4) are connected by a second connecting pipeline, and a submerged pump (5) is arranged on the second connecting pipeline.
8. A low-temperature methanol washing device according to claim 7, characterized in that the methanol collecting device (3) comprises a transverse tank body and a bottom groove, and one end of the second connecting pipeline extends into the bottom groove.
9. A cryogenic methanol washing apparatus according to any one of claims 1 to 8 wherein there are two heat exchangers arranged in parallel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022216101.6U CN213433753U (en) | 2020-09-30 | 2020-09-30 | Low-temperature methanol washing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022216101.6U CN213433753U (en) | 2020-09-30 | 2020-09-30 | Low-temperature methanol washing device |
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| Publication Number | Publication Date |
|---|---|
| CN213433753U true CN213433753U (en) | 2021-06-15 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022216101.6U Active CN213433753U (en) | 2020-09-30 | 2020-09-30 | Low-temperature methanol washing device |
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| CN (1) | CN213433753U (en) |
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