CN220055013U - Synthetic gas system ethylene glycol storage device - Google Patents
Synthetic gas system ethylene glycol storage device Download PDFInfo
- Publication number
- CN220055013U CN220055013U CN202320451772.1U CN202320451772U CN220055013U CN 220055013 U CN220055013 U CN 220055013U CN 202320451772 U CN202320451772 U CN 202320451772U CN 220055013 U CN220055013 U CN 220055013U
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- China
- Prior art keywords
- valve
- storage tank
- ethylene glycol
- nitrogen
- storage device
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- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 title claims abstract description 115
- 238000003860 storage Methods 0.000 title claims abstract description 51
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 78
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 39
- 239000007789 gas Substances 0.000 claims abstract description 21
- WGCNASOHLSPBMP-UHFFFAOYSA-N hydroxyacetaldehyde Natural products OCC=O WGCNASOHLSPBMP-UHFFFAOYSA-N 0.000 claims abstract description 17
- 230000001105 regulatory effect Effects 0.000 claims abstract description 17
- 125000002887 hydroxy group Chemical group [H]O* 0.000 claims abstract description 11
- 230000015572 biosynthetic process Effects 0.000 claims description 11
- 238000003786 synthesis reaction Methods 0.000 claims description 11
- 230000007797 corrosion Effects 0.000 abstract description 8
- 238000005260 corrosion Methods 0.000 abstract description 8
- 230000003647 oxidation Effects 0.000 abstract description 5
- 238000007254 oxidation reaction Methods 0.000 abstract description 5
- 230000006866 deterioration Effects 0.000 abstract description 4
- 238000000275 quality assurance Methods 0.000 abstract description 4
- MUBZPKHOEPUJKR-UHFFFAOYSA-N Oxalic acid Chemical compound OC(=O)C(O)=O MUBZPKHOEPUJKR-UHFFFAOYSA-N 0.000 description 6
- 230000003628 erosive effect Effects 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 239000003208 petroleum Substances 0.000 description 3
- 229920000728 polyester Polymers 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 230000008676 import Effects 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 235000006408 oxalic acid Nutrition 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 230000008439 repair process Effects 0.000 description 2
- 239000010963 304 stainless steel Substances 0.000 description 1
- 229910000975 Carbon steel Inorganic materials 0.000 description 1
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 description 1
- 239000005977 Ethylene Substances 0.000 description 1
- IAYPIBMASNFSPL-UHFFFAOYSA-N Ethylene oxide Chemical compound C1CO1 IAYPIBMASNFSPL-UHFFFAOYSA-N 0.000 description 1
- AEMRFAOFKBGASW-UHFFFAOYSA-N Glycolic acid Chemical compound OCC(O)=O AEMRFAOFKBGASW-UHFFFAOYSA-N 0.000 description 1
- LOMVENUNSWAXEN-UHFFFAOYSA-N Methyl oxalate Chemical compound COC(=O)C(=O)OC LOMVENUNSWAXEN-UHFFFAOYSA-N 0.000 description 1
- 229910000589 SAE 304 stainless steel Inorganic materials 0.000 description 1
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000002528 anti-freeze Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000010962 carbon steel Substances 0.000 description 1
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 230000003197 catalytic effect Effects 0.000 description 1
- 230000001413 cellular effect Effects 0.000 description 1
- 239000003034 coal gas Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000006056 electrooxidation reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000036571 hydration Effects 0.000 description 1
- 238000006703 hydration reaction Methods 0.000 description 1
- 238000005984 hydrogenation reaction Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 239000010687 lubricating oil Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 150000007524 organic acids Chemical class 0.000 description 1
- NIFHFRBCEUSGEE-UHFFFAOYSA-N oxalic acid Chemical compound OC(=O)C(O)=O.OC(=O)C(O)=O NIFHFRBCEUSGEE-UHFFFAOYSA-N 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 239000012071 phase Substances 0.000 description 1
- 229920005906 polyester polyol Polymers 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000000241 respiratory effect Effects 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
- 239000004332 silver Substances 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- Filling Or Discharging Of Gas Storage Vessels (AREA)
Abstract
The utility model discloses a storage device for preparing ethylene glycol from synthetic gas, which comprises a storage tank, a breather valve and a remote pressure gauge, wherein the breather valve and the remote pressure gauge are arranged on the storage tank, a nitrogen pipeline is inserted into the tank top edge of the storage tank, the nitrogen pipeline comprises a first horizontal section, a vertical section and a second horizontal section, a main valve is arranged on the first horizontal section, a flowmeter is arranged on the vertical section, a first cut-off valve and a second cut-off valve are respectively arranged above and below the flowmeter, and a third cut-off valve, a filter, a self-operated regulating valve, a check valve and a fourth cut-off valve are sequentially arranged on the second horizontal section, so that hydroxyl contained in ethylene glycol is prevented from being oxidized after nitrogen is input into the storage tank through the nitrogen pipeline. Can effectively prevent the problems of quality deterioration and equipment corrosion caused by oxidation of hydroxyl contained in glycol, and each index of the product reaches or exceeds each index specified in GB/T4649-2018, and has the characteristics of nitrogen saving, small investment and product quality assurance.
Description
Technical Field
The utility model relates to the technical field of ethylene glycol storage equipment, in particular to a storage device for preparing ethylene glycol from synthesis gas.
Background
Ethylene glycol, also known as "glycol", is a strategic and large chemical base material, and has very wide industrial application, mainly for the preparation of polyesters, antifreeze, adhesives, paint solvents, cold-resistant lubricating oils, polyester polyols, and the like. In recent years, the production and development of polyester in China are fast, and the demand for ethylene glycol is increased from 636 ten thousand tons to 710 ten thousand tons in 2008 to 2010. Although the production capacity and the yield of ethylene glycol in China are fast, the ethylene glycol still cannot meet the increasing market demands of domestic polyester and the like, a large amount of import is still needed each year, and the import dependence in 2006 is as high as 72.26%.
At present, two main technical routes for preparing ethylene glycol exist: firstly, the petroleum route is mainly that ethylene is oxidized by gas phase on a silver catalyst to generate ethylene oxide, and then liquid phase non-catalytic hydration is carried out to prepare ethylene glycol products, which has the advantages of mature technology and application surface; another method is a technical route for preparing glycol from synthetic gas, which prepares dimethyl oxalate by using coal or natural gas to prepare synthetic gas, and then prepares glycol by hydrogenation. With the growing shortage of world petroleum resources and shortage of petroleum resources, a synthetic glycol route using synthesis gas as a raw material is widely focused by people, and the synthesis gas is adopted to prepare glycol most suitable for the current situation of China from the aspects of economic rationality of raw material selection and energy structure composition of China, and the scale of the project of the synthesis gas to prepare glycol under construction or put into production in China is up to 200 ten thousand tons at present.
Ethylene glycol contains hydroxyl groups and is used for a long time, and ethylene glycol is oxidized into glycollic acid and then into oxalic acid, namely oxalic acid (oxalic acid), and contains 2 carboxyl groups. Glycol oxalic acid causes corrosion to equipment and leaks. In general, ethylene glycol is very corrosive after oxidation. Glycol comes into contact with air during storage, which causes cavitation erosion of the equipment. Cavitation erosion tends to produce locally aggregated cellular clusters, resulting in erosion of the equipment. Meanwhile, the glycol contains unstable hydroxyl and is easy to acidify, and the like, so that carbon steel and general stainless steel (304 stainless steel) can be corroded. And the content of rust impurities and the like in the solution system is high, and the impurity content reaches about 1%. Resulting in a decrease in product quality.
In addition, since the aqueous ethylene glycol solution is acidic due to oxidation to organic acid during use, electrochemical corrosion, scale corrosion, acid corrosion and the like are liable to occur, and thus an apparatus capable of storing synthesis gas for a long period of time is required to avoid the problems of deterioration in quality and equipment corrosion caused by oxidation of hydroxyl groups contained in ethylene glycol.
Disclosure of Invention
In order to solve certain or some technical problems existing in the prior art, the utility model aims to provide a storage device for preparing ethylene glycol from synthetic gas, which can effectively prevent the problems of poor quality and equipment corrosion caused by oxidation of hydroxyl contained in ethylene glycol, and each index of a product reaches or exceeds each index specified in GB/T4649-2018, and has the characteristics of nitrogen saving, small investment and product quality assurance.
In order to solve the prior art problems, the utility model adopts the following technical scheme:
the storage device for preparing the glycol from the synthetic gas comprises a storage tank, a breather valve and a remote pressure gauge which are arranged on the storage tank, wherein a nitrogen pipeline is inserted into the top edge of the storage tank,
the nitrogen line comprises a first horizontal section, a vertical section and a second horizontal section,
a main valve is arranged on the first horizontal section,
a flowmeter is arranged on the vertical section, a first cut-off valve and a second cut-off valve are respectively arranged above and below the flowmeter,
and a third cut-off valve, a filter, a self-operated regulating valve, a check valve and a fourth cut-off valve are sequentially arranged on the second horizontal section, and the hydroxyl contained in the glycol is prevented from being oxidized after nitrogen is input into the storage tank through the nitrogen pipe.
Optionally, a regulating valve actuator 11 is arranged between the self-operated regulating valve and the tank top of the storage tank, and the regulating valve actuator 11 is pressed from the tank top of the storage tank 8.
Optionally, the two horizontal segment directions of the nitrogen pipeline form an included angle of 45 degrees with the tank central axis of the storage tank.
Optionally, the top end of the vertical section of the nitrogen pipeline is 1m higher than the top edge of the storage tank, and the vertical section and the second horizontal section are connected through a 90-degree elbow.
Optionally, one side of the flowmeter is provided with a reducing of DN100/DN 80.
Optionally, an auxiliary line valve is arranged on the flowmeter.
Optionally, a DN100150BL line is used for the nitrogen line.
Compared with the prior art, the utility model has the beneficial effects that:
due to the adoption of a reasonable and efficient nitrogen pipeline flow, the method has the characteristics of reasonable flow, nitrogen saving, small investment and product quality assurance, and can effectively prevent the hydroxyl contained in the glycol from being oxidized to cause quality deterioration and equipment corrosion, and various indexes of the product reach or exceed various indexes specified in GB/T4649-2018.
Drawings
FIG. 1 is a schematic diagram of the structure of the present utility model;
in the figure: 1. a respiratory valve; 2. a remote pressure gauge; 3. a fourth shut-off valve; 4. a check valve; 5. a self-operated regulating valve; 6. a filter; 7. a flow meter; 8. a storage tank; 9. a secondary line valve; 10. a main valve; 11. a regulating valve actuator; 12. a nitrogen line; 13. a first horizontal segment; 14. a vertical section; 15. a second horizontal segment; 16. a first shut-off valve; 17. a second shut-off valve; 18. and a third shut-off valve.
Detailed Description
The present utility model will be further described with reference to the accompanying drawings and detailed description, wherein it is to be understood that, on the premise of no conflict, the following embodiments or technical features may be arbitrarily combined to form new embodiments.
In the description of the present utility model, it should be understood that the directions or positional relationships indicated by the terms "upper", "lower", "left", "right", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of description and simplification of the description, and do not indicate or imply that the apparatus or element in question must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present utility model.
The terms "first," "second," and the like in this specification are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged, as appropriate, such that embodiments of the present utility model may be implemented in sequences other than those illustrated or described herein, and that the objects identified by "first," "second," etc. are generally of a type, and are not limited to the number of objects, such as the first object may be one or more. Furthermore, in the description and claims, "and/or" means at least one of the connected objects, and the character "/", generally means that the associated object is an "or" relationship.
As shown in fig. 1, a storage device for preparing glycol from synthetic gas comprises a storage tank 8, a breather valve 1 and a remote pressure gauge 2 which are arranged on the storage tank 8, wherein a nitrogen pipeline 12 is inserted into the top edge of the storage tank 8,
the nitrogen line 12 comprises a first horizontal section 13, a vertical section 14 and a second horizontal section 15,
the first horizontal section 13 is provided with a main valve 10,
the vertical section 14 is provided with a flowmeter 7, a first cut-off valve 16 and a second cut-off valve 17 are respectively arranged above and below the flowmeter 7,
the second horizontal section 15 is provided with a third shut-off valve 18, a filter 6, a self-operated adjusting valve 5, a check valve 4 and a fourth shut-off valve 3 in order, and the nitrogen is fed into the storage tank 8 through the nitrogen pipeline 12 to prevent the hydroxyl groups contained in the glycol from being oxidized.
When the synthetic gas ethylene glycol is stored, the valves on the nitrogen pipeline 12 are sequentially opened, the pipeline is confirmed to be smooth, qualified and dry nitrogen of the air source is confirmed, the self-operated regulating valve 5 is automatically opened after the pressure in the storage tank 8 is lower than 2Kpa, and is automatically closed after the pressure is higher than 2Kpa, so that the effect of saving nitrogen is achieved, the pressure signals in the flowmeter 7 and the storage tank 8 are led to the DCS, a master control personnel monitors at any time, and the filter 6 is checked during the shutdown period of the storage tank 8. Due to the adoption of a reasonable and efficient nitrogen pipeline 12 flow, the method has the characteristics of reasonable flow, nitrogen saving, small investment and product quality assurance, and can effectively prevent the hydroxyl contained in the glycol from being oxidized to cause quality deterioration and equipment corrosion, and various indexes of the product reach or exceed various indexes specified in GB/T4649-2018. Wherein, install third trip valve 18 and fourth trip valve 3 respectively in the both sides of second horizontal segment 15, can conveniently examine and repair filter 6, self-operated control valve 5 and check valve 4 and maintain, can conveniently examine and repair flowmeter 7 through first trip valve 16 and second trip valve 17.
A regulating valve actuator 11 is arranged between the self-operated regulating valve 5 and the tank top of the storage tank 8, and the regulating valve actuator 11 is pressed from the tank top of the storage tank 8; the pressure in the storage tank 8 can be sensed through the regulating valve actuator 11, and when the pressure is too high, the nitrogen can be timely closed through the self-operated regulating valve 5, so that the nitrogen is saved. The two horizontal section directions of the nitrogen pipeline 12 form an included angle of 45 degrees with the tank central axis of the storage tank 8; the top end of the vertical section 14 of the nitrogen pipeline 12 is 1m higher than the tank top edge of the storage tank 8, and the vertical section 14 and the second horizontal section 15 are connected through a 90-degree elbow.
The vertical section 14 and the two horizontal sections are both provided with 90-degree elbows, so that the connection is more convenient, wherein the two horizontal sections of the nitrogen pipeline 12 form an included angle of 45 degrees with the tank central axis of the storage tank 8, the air supply pipeline can be more attached to the storage tank 8, and the whole installation volume is smaller.
The improvement is that one side of the flowmeter 7 is provided with a diameter change of DN100/DN80, which can ensure that the nitrogen amount is enough, and the flowmeter 7 can measure more accurately after the diameter change; the flowmeter 7 is provided with a secondary line valve 9, and after the secondary line valve 9 is matched with the use of the first cut-off valve 16 and the second cut-off valve 17, the flowmeter 7 can work normally when a problem occurs and the overhaul is cut out; the DN100150BL pipeline is adopted for the nitrogen pipeline 12, so that the pressure grade of the pipeline can be better met.
The above embodiments are only preferred embodiments of the present utility model, and the scope of the present utility model is not limited thereto, but any insubstantial changes and substitutions made by those skilled in the art on the basis of the present utility model are intended to be within the scope of the present utility model as claimed.
Claims (7)
1. The utility model provides a synthetic gas system ethylene glycol storage device which characterized in that: comprises a storage tank (8), a breather valve (1) and a remote pressure gauge (2) which are arranged on the storage tank (8), wherein a nitrogen pipeline (12) is inserted into the tank top edge of the storage tank (8),
the nitrogen line (12) comprises a first horizontal section (13), a vertical section (14) and a second horizontal section (15),
a main valve (10) is arranged on the first horizontal section (13),
a flowmeter (7) is arranged on the vertical section (14), a first cut-off valve (16) and a second cut-off valve (17) are respectively arranged above and below the flowmeter (7),
and a third cut-off valve (18), a filter (6), a self-operated regulating valve (5), a check valve (4) and a fourth cut-off valve (3) are sequentially arranged on the second horizontal section (15), and the nitrogen is input into the storage tank (8) through the nitrogen pipeline (12) to prevent the hydroxyl contained in the glycol from being oxidized.
2. A storage device for producing ethylene glycol from synthesis gas according to claim 1, wherein: and a regulating valve actuator (11) is arranged between the self-operated regulating valve (5) and the tank top of the storage tank (8), and the regulating valve actuator (11) is pressed from the tank top of the storage tank (8).
3. A storage device for producing ethylene glycol from synthesis gas according to claim 1, wherein: the two horizontal segment directions of the nitrogen pipeline (12) and the central axis of the storage tank (8) form an included angle of 45 degrees.
4. A storage device for producing ethylene glycol from synthesis gas according to claim 3, wherein: the top end of the vertical section (14) of the nitrogen pipeline (12) is 1m higher than the tank top edge of the storage tank (8), and the vertical section (14) is connected with the second horizontal section (15) through a 90-degree elbow.
5. The storage device for producing ethylene glycol from synthesis gas according to any one of claims 1 to 4, wherein: one side of the flowmeter (7) is provided with a reducing of DN100/DN 80.
6. The storage device for producing ethylene glycol from synthesis gas according to claim 5, wherein: an auxiliary line valve (9) is arranged on the flowmeter (7).
7. A storage device for producing ethylene glycol from synthesis gas according to claim 1, wherein: the nitrogen line (12) employs a DN100150BL line.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320451772.1U CN220055013U (en) | 2023-03-10 | 2023-03-10 | Synthetic gas system ethylene glycol storage device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320451772.1U CN220055013U (en) | 2023-03-10 | 2023-03-10 | Synthetic gas system ethylene glycol storage device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220055013U true CN220055013U (en) | 2023-11-21 |
Family
ID=88759312
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320451772.1U Active CN220055013U (en) | 2023-03-10 | 2023-03-10 | Synthetic gas system ethylene glycol storage device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220055013U (en) |
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2023
- 2023-03-10 CN CN202320451772.1U patent/CN220055013U/en active Active
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