CN216837851U - Low-temperature methanol washing and pre-washing methanol filtering device - Google Patents
Low-temperature methanol washing and pre-washing methanol filtering device Download PDFInfo
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- CN216837851U CN216837851U CN202220032441.XU CN202220032441U CN216837851U CN 216837851 U CN216837851 U CN 216837851U CN 202220032441 U CN202220032441 U CN 202220032441U CN 216837851 U CN216837851 U CN 216837851U
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Abstract
The utility model relates to a low temperature methyl alcohol is washed methanol filter equipment in advance relates to low temperature methyl alcohol and is washed technology field, including flash tank, filter and thermal regeneration tower, the filter is at least two, the export of flash tank respectively with the methanol import intercommunication of two at least filters, the methanol export of every filter all with the import intercommunication of thermal regeneration tower. The utility model has the advantages that: the filter filters impurities in the methanol, avoids the impurities from being brought into the thermal regeneration tower, and ensures the regeneration effect of the thermal regeneration tower, thereby improving the recovery utilization rate of the methanol, reducing the emission of the polluted methanol, reducing the environmental pollution and the safety risk, avoiding the waste, realizing the safe and environment-friendly production, and saving energy and reducing consumption. The number of the filters is at least two, at least one of the filters can be set to work, and the rest filters are standby or cleaned, so that the reliability of the filters is guaranteed. The flash tank carries out flash evaporation on the methanol, and removes acid gas adsorbed in the methanol.
Description
Technical Field
The utility model relates to a low temperature methyl alcohol washes technology field, concretely relates to low temperature methyl alcohol washes methanol filter equipment in advance.
Background
The domestic coal chemical industry adopts a low-temperature methanol washing process to remove H in the crude gas2S、CO2And removing COS, wherein the low-temperature methanol washing process refers to that acidic gas CO contained in the converted gas is removed at a certain pressure and low temperature by low-temperature methanol2、H2S, COS and mercaptan removal. The process of absorbing acid gas by methanol has no chemical reaction, so the method belongs to physical absorption: using low-temperature methanol organic solvent as absorbent and CO2、H2S, COS ratio H2CO is removed by the characteristic of high solubility in the absorbent, and the solution after absorption is regenerated by simple flash desorption gas to release CO2、H2S and the like.
But is limited in that the prewashed methanol contains a large amount of impurities, and after the prewashed methanol is brought into the thermal regeneration tower, the impurities are accumulated in the thermal regeneration tower, so that the regeneration effect of the thermal regeneration tower is reduced.
If only increasing the filter, the filter is along with filterable going on, and the cake layer or the gel layer thickness that form on filtration membrane surface increases gradually, and the velocity of flow reduces gradually, needs wash, can't realize online switching, causes the device risk of parkking, and the reliability is low.
SUMMERY OF THE UTILITY MODEL
The utility model discloses the technical problem that solve is how to guarantee thermal regeneration tower regeneration effect, guarantee the filter reliability.
The utility model provides an above-mentioned technical problem's technical scheme as follows: the utility model provides a low temperature methanol washing methanol filter equipment in advance, includes flash tank, filter and thermal regeneration tower, the filter is at least two, the export of flash tank respectively with at least two the methyl alcohol import intercommunication of filter, every the methyl alcohol export of filter all with the import intercommunication of thermal regeneration tower.
The utility model has the advantages that: the filter filters impurities in the methanol, avoids the impurities from being brought into the thermal regeneration tower, and ensures the regeneration effect of the thermal regeneration tower, thereby improving the recovery utilization rate of the methanol, reducing the emission of the polluted methanol, reducing the environmental pollution and the safety risk, avoiding the waste, realizing the safe and environment-friendly production, and saving energy and reducing consumption. The number of the filters is at least two, at least one of the filters can be set to work, and the rest filters are standby or cleaned, so that the reliability of the filters is guaranteed. The flash tank carries out flash evaporation on the methanol and removes acid gas absorbed in the methanol.
On the basis of the technical scheme, the utility model discloses can also do following improvement.
Furthermore, the device also comprises a nitrogen back-blowing pipeline, wherein the gas outlet of the nitrogen back-blowing pipeline is respectively communicated with the back-blowing inlets of at least two filters, and the back-blowing outlets of the at least two filters are communicated with a sewage discharge pipe.
The beneficial effect of adopting the further scheme is that: as the filtration is carried out, impurities on the filter element of the filter are increased, the liquid flow is more difficult to pass through the filter element, the pressure difference between the front and the back of the filter is increased, when the pressure difference between the filtration membranes of one filter reaches a preset value, the filter is switched to enter a backwashing mode, and the other filter enters a filtration mode. And under a backwashing mode, nitrogen in the nitrogen back-flushing pipeline is used as back-flushing gas, the back-flushing gas is pressurized from the side part of the filter, and after the pressurization is finished, a back-flushing outlet is quickly opened to form an air pressure blasting plug flow so as to remove filter cakes accumulated on the inner surface of the filter element. After the backwashing is finished, the filter enters a standby state or is switched back to a filtering mode.
Furthermore, a nitrogen stop valve is arranged on the nitrogen back-blowing pipeline, and a back-blowing outlet valve is arranged on the pipeline between each filter back-blowing outlet and the sewage discharge pipe.
Further, the device also comprises a prewashing flash tank, wherein an outlet of the prewashing flash tank is communicated with an inlet of the flash tank.
The beneficial effect of adopting the further scheme is that: the prewashing flash tank is used for preliminarily removing the acid gas adsorbed in the methanol, and then the flash tank is used for further removing the acid gas.
The device further comprises a heater, wherein the heater is arranged on a pipeline between the outlet of the prewashing flash tank and the inlet of the flash tank in series.
The beneficial effect of adopting the further scheme is that: the methanol is heated and then flashed again, so that the acid gas in the methanol is removed completely.
And the outlet of the flash tank is communicated with the inlet of the bypass pipe, and the outlet of the bypass pipe is communicated with the inlet of the thermal regeneration tower and the sewage discharge pipe respectively.
The beneficial effect of adopting the further scheme is that: when equipment just started, impurity is more in the equipment, and accessible bypass pipe directly discharges methyl alcohol to the blow off pipe, reduces the influence of impurity to the system. The outlet of the flash tank can also be connected directly to the thermal regeneration column through a by-pass line when special conditions are encountered, such as all filters needing maintenance, replacement or back flushing.
Furthermore, a first bypass valve is arranged on the bypass pipe, and a second bypass valve is arranged on a pipeline between the outlet of the bypass pipe and the sewage discharge pipe.
Furthermore, the filter element of the filter is made of silicon carbide.
Furthermore, a methanol inlet valve is arranged on a pipeline between the flash tank outlet and each filter methanol inlet, and a methanol outlet valve is arranged on a pipeline between each filter methanol outlet and the inlet of the thermal regeneration tower.
Drawings
Fig. 1 is a schematic diagram of the low-temperature methanol washing and pre-washing methanol filtering device of the utility model.
In the drawings, the components represented by the respective reference numerals are listed below:
1. prewashing a flash tank; 2. a heater; 3. a flash tank; 4. a filter; 401. a back-flushing outlet valve; 402. a methanol inlet valve; 403. a methanol outlet valve; 5. a thermal regeneration column; 6. a nitrogen back-flushing pipeline; 601. a nitrogen stop valve; 7. a blow-off pipe; 8. a bypass pipe; 801. a first bypass valve; 802. a second bypass valve.
Detailed Description
The principles and features of the present invention are described below in conjunction with the following drawings, the examples given are only intended to illustrate the present invention and are not intended to limit the scope of the present invention.
In the present invention, the term "communicate" means communicate through a pipe.
As shown in fig. 1, the present embodiment provides a low-temperature methanol washing and pre-washing methanol filtering apparatus, which includes a flash tank 3, at least two filters 4 and a thermal regeneration tower 5, an outlet of the flash tank 3 is respectively communicated with methanol inlets of the at least two filters 4, and a methanol outlet of each of the filters 4 is communicated with an inlet of the thermal regeneration tower 5.
The pre-washed methanol absorbs acid gas of the crude gas in an absorption tower, then enters a flash tank 3 for flash evaporation, is filtered from impurities by a filter 4, and then enters a thermal regeneration tower 5. The filter 4 filters impurities in the methanol, avoids the impurities from being brought into the thermal regeneration tower 5, and ensures the regeneration effect of the thermal regeneration tower 5, thereby improving the recovery utilization rate of the methanol, reducing the emission of the polluted methanol, reducing the environmental pollution and the safety risk, avoiding the waste, and realizing the safe, environment-friendly, energy-saving and consumption-reducing production. The number of the filters 4 is at least two, at least one of the filters can be set to work, and the rest of the filters are standby or cleaned, so that the reliability of the filters 4 is guaranteed. The flash tank 3 performs flash evaporation on the methanol to remove the acid gas adsorbed in the methanol.
Fig. 1 shows a schematic diagram of the case where two filters 4 are provided, but of course, the filters 4 may be provided in parallel in three, four, five or more.
On the basis of any scheme, the device further comprises a nitrogen back-blowing pipeline 6, wherein the air outlet of the nitrogen back-blowing pipeline 6 is respectively communicated with the back-blowing inlets of the at least two filters 4, and the back-blowing outlets of the at least two filters 4 are communicated with a sewage discharge pipe 7.
As the filtration progresses, the impurities on the filter element of the filter 4 increase, the liquid flow is more and more difficult to pass through the filter element, the pressure difference between the front and the back of the filter 4 increases, when the filtration transmembrane pressure difference of one filter 4 reaches a preset value, the filter 4 is switched to a backwashing mode, and the other filter 4 is switched to a filtering mode. And discharging the waste liquid or waste material after the back washing to a trench through a drain pipe 7. And the waste in the trench is purified and treated uniformly by subsequent treatment equipment.
In the filtering mode, the methanol inlet and the methanol outlet of the filter 4 are opened, and the back-blowing inlet and the back-blowing outlet are closed.
Under the backwashing mode, a methanol inlet and a methanol outlet of the filter 4 are closed, a back flushing inlet and a back flushing outlet are opened, nitrogen in the nitrogen back flushing pipeline 6 is used as back flushing gas, the back flushing gas is pressurized from the side part of the filter 4, after the pressurization is finished, the back flushing outlet is quickly opened to form an air pressure blasting plug flow, filter cakes accumulated on the inner surface of the filter element are removed, the filter cakes are discharged from the back flushing outlet, or a maintenance port of the filter 4 is opened, and the filter cakes are manually cleaned. After the backwash is completed, the filter 4 is put into a standby state or switched back to the filtration mode.
Specifically, a nitrogen stop valve 601 is arranged on the nitrogen back-blowing pipeline 6, and a back-blowing outlet valve 401 is arranged on the pipeline between the back-blowing outlet of each filter 4 and the sewage discharge pipe 7.
The opening and closing of the back-blowing inlet are controlled through the nitrogen stop valve 601, and the opening and closing of the back-blowing outlet are controlled through the back-blowing outlet valve 401.
On the basis of any scheme, the system further comprises a prewashing flash tank 1, and an outlet of the prewashing flash tank 1 is communicated with an inlet of the flash tank 3.
The prewash flash tank 1 is used for primarily removing the acid gas adsorbed in the methanol, and then the flash tank 3 is used for further removing the acid gas.
On the basis of any scheme, the system further comprises a heater 2, and the heater 2 is arranged on a pipeline between an outlet of the prewashing flash tank 1 and an inlet of the flash tank 3 in series.
The methanol is heated and then flashed again, so that the acid gas in the methanol is removed completely.
On the basis of any scheme, the system further comprises a bypass pipe 8, the outlet of the flash tank 3 is communicated with the inlet of the bypass pipe 8, and the outlet of the bypass pipe 8 is communicated with the inlet of the thermal regeneration tower 5 and the sewage discharge pipe 7 respectively.
Specifically, a first bypass valve 801 is arranged on the bypass pipe 8, and a second bypass valve 802 is arranged on a pipeline between the outlet of the bypass pipe 8 and the sewage discharge pipe 7.
When the equipment is just started, impurities in the equipment are more, the first bypass valve 801 and the second bypass valve 802 can be opened, the methanol inlet of the filter 4 is closed, the methanol is directly discharged to the sewage discharge pipe 7 through the bypass pipe 8, and the influence of the impurities on the system is reduced. The outlet of the flash tank 3 can also be connected directly to the thermal regeneration column 5 through a by-pass pipe 8 when special conditions are encountered, such as maintenance, replacement or back flushing of all the filters 4.
On the basis of any scheme, the filter element of the filter 4 is made of silicon carbide.
Specifically, a methanol inlet valve 402 is arranged on a pipeline between the outlet of the flash tank 3 and the methanol inlet of each filter 4, and a methanol outlet valve 403 is arranged on a pipeline between the methanol outlet of each filter 4 and the inlet of the thermal regeneration tower 5.
The methanol inlet valve 402 and the methanol outlet valve 403 are respectively used for controlling the opening and closing of the methanol inlet and the methanol outlet of the filter 4.
The utility model discloses in, nitrogen gas stop valve 601, blowback outlet valve 401, methyl alcohol inlet valve 402, methyl alcohol outlet valve 403, first bypass valve 801 and second bypass valve 802 can be for manually operated valve or be the automatically controlled valve, when above-mentioned valve is the automatically controlled valve, preferably, still include the controller, the controller respectively with nitrogen gas stop valve 601, blowback outlet valve 401, methyl alcohol inlet valve 402, methyl alcohol outlet valve 403, first bypass valve 801 and second bypass valve 802 communication connection to control opening and close of each valve.
The process route of the low-temperature methanol washing is as follows: the crude gas is sent to the prewashing section of the absorption tower, and the crude gas contains impurities such as: NH3And HCN and the likeBy a small stream of CO from the absorption column2Subcooled CO-rich absorption section2And (4) absorbing and removing the methanol. The prewashed methanol leaving the bottom of the absorption tower passes through a prewash flash tank 1 and a heater 2, enters a flash tank 3, enters a filter 4 from an outlet at the lower part of the flash tank 3 for filtering, and then enters a thermal flash section of a thermal regeneration tower 5. Wherein, filter 4 sets up at least two to realize filter 4 online switching uses, filter 4 that does not use can carry out the back flush, guarantees the filter effect.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or to implicitly indicate the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the present invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included within the protection scope of the present invention.
Claims (9)
1. The utility model provides a low temperature methanol washing methanol filter equipment that washes in advance, its characterized in that includes flash tank (3), filter (4) and thermal regeneration tower (5), filter (4) are at least two, the export of flash tank (3) respectively with at least two the methyl alcohol import intercommunication of filter (4), every the methyl alcohol export of filter (4) all with the import intercommunication of thermal regeneration tower (5).
2. The low-temperature methanol washing and pre-washing methanol filtering device as claimed in claim 1, further comprising a nitrogen back-blowing pipeline (6), wherein an air outlet of the nitrogen back-blowing pipeline (6) is respectively communicated with back-blowing inlets of at least two of the filters (4), and back-blowing outlets of at least two of the filters (4) are both communicated with a sewage discharge pipe (7).
3. A low-temperature methanol washing and pre-washing methanol filtering device as claimed in claim 2, wherein a nitrogen stop valve (601) is arranged on the nitrogen blowback pipeline (6), and a blowback outlet valve (401) is arranged on the pipeline between the blowback outlet of each filter (4) and the sewage discharge pipe (7).
4. A low temperature methanol washing and pre-washing methanol filtering device according to claim 1, further comprising a pre-washing flash tank (1), wherein an outlet of the pre-washing flash tank (1) is communicated with an inlet of the flash tank (3).
5. A low-temperature methanol washing and pre-washing methanol filtering device as claimed in claim 4, characterized by further comprising a heater (2), wherein the heater (2) is arranged in series on a pipeline between an outlet of the pre-washing flash tank (1) and an inlet of the flash tank (3).
6. A low-temperature methanol washing and pre-washing methanol filtering device as claimed in any one of claims 1 to 5, characterized by further comprising a bypass pipe (8), wherein the outlet of the flash tank (3) is also communicated with the inlet of the bypass pipe (8), and the outlet of the bypass pipe (8) is respectively communicated with the inlet of the thermal regeneration tower (5) and a sewage discharge pipe (7).
7. The low-temperature methanol washing and pre-washing methanol filtering device as claimed in claim 6, wherein a first bypass valve (801) is arranged on the bypass pipe (8), and a second bypass valve (802) is arranged on a pipeline between the outlet of the bypass pipe (8) and the sewage discharge pipe (7).
8. A low-temperature methanol washing and pre-washing methanol filtering device as claimed in any one of claims 1 to 5, wherein the filter element of the filter (4) is made of silicon carbide.
9. A low-temperature methanol washing and pre-washing methanol filtering device as claimed in any one of claims 1 to 5, wherein a methanol inlet valve (402) is arranged on a pipeline between the outlet of the flash tank (3) and the methanol inlet of each filter (4), and a methanol outlet valve (403) is arranged on a pipeline between the methanol outlet of each filter (4) and the inlet of the thermal regeneration tower (5).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220032441.XU CN216837851U (en) | 2022-01-07 | 2022-01-07 | Low-temperature methanol washing and pre-washing methanol filtering device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220032441.XU CN216837851U (en) | 2022-01-07 | 2022-01-07 | Low-temperature methanol washing and pre-washing methanol filtering device |
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| Publication Number | Publication Date |
|---|---|
| CN216837851U true CN216837851U (en) | 2022-06-28 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202220032441.XU Active CN216837851U (en) | 2022-01-07 | 2022-01-07 | Low-temperature methanol washing and pre-washing methanol filtering device |
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| CN (1) | CN216837851U (en) |
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- 2022-01-07 CN CN202220032441.XU patent/CN216837851U/en active Active
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