CN111228841A - Device and method for preventing system freezing and blocking in carbon dioxide double-tower rectification separation system - Google Patents
Device and method for preventing system freezing and blocking in carbon dioxide double-tower rectification separation system Download PDFInfo
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- CN111228841A CN111228841A CN202010168965.7A CN202010168965A CN111228841A CN 111228841 A CN111228841 A CN 111228841A CN 202010168965 A CN202010168965 A CN 202010168965A CN 111228841 A CN111228841 A CN 111228841A
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- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 title claims abstract description 54
- 238000007710 freezing Methods 0.000 title claims abstract description 53
- 238000000926 separation method Methods 0.000 title claims abstract description 40
- 229910002092 carbon dioxide Inorganic materials 0.000 title claims abstract description 28
- 239000001569 carbon dioxide Substances 0.000 title claims abstract description 27
- 238000000034 method Methods 0.000 title claims abstract description 16
- 230000008014 freezing Effects 0.000 title abstract description 7
- 230000000903 blocking effect Effects 0.000 title abstract description 6
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 claims abstract description 69
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 20
- 239000003112 inhibitor Substances 0.000 claims description 25
- 230000002528 anti-freeze Effects 0.000 claims description 18
- 239000002994 raw material Substances 0.000 claims description 13
- 239000007788 liquid Substances 0.000 claims description 7
- 238000002156 mixing Methods 0.000 claims description 3
- 238000002425 crystallisation Methods 0.000 abstract description 7
- 230000008025 crystallization Effects 0.000 abstract description 7
- 239000007789 gas Substances 0.000 description 35
- 239000002808 molecular sieve Substances 0.000 description 8
- URGAHOPLAPQHLN-UHFFFAOYSA-N sodium aluminosilicate Chemical compound [Na+].[Al+3].[O-][Si]([O-])=O.[O-][Si]([O-])=O URGAHOPLAPQHLN-UHFFFAOYSA-N 0.000 description 8
- 239000013078 crystal Substances 0.000 description 4
- 230000018044 dehydration Effects 0.000 description 3
- 238000006297 dehydration reaction Methods 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 230000001476 alcoholic effect Effects 0.000 description 1
- 229910000323 aluminium silicate Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000008929 regeneration Effects 0.000 description 1
- 238000011069 regeneration method Methods 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 238000010257 thawing Methods 0.000 description 1
- 239000002912 waste gas Substances 0.000 description 1
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D3/00—Distillation or related exchange processes in which liquids are contacted with gaseous media, e.g. stripping
- B01D3/14—Fractional distillation or use of a fractionation or rectification column
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B32/00—Carbon; Compounds thereof
- C01B32/50—Carbon dioxide
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Carbon And Carbon Compounds (AREA)
Abstract
The invention discloses a device and a method for preventing a system from being frozen and blocked in a carbon dioxide double-tower rectification separation system, and belongs to the technical field of carbon dioxide rectification separation. The device for preventing the system from being frozen and blocked comprises at least one anti-freezing drip tank, wherein the anti-freezing drip tank is communicated with a feed gas conveying pipeline in front of the rectification separation tower in a parallel connection mode. Compared with the prior art, the device for preventing the system from being frozen and blocked is arranged in the carbon dioxide double-tower rectification separation system, and the methanol is dripped into the carbon dioxide double-tower rectification separation system through the device for preventing the system from being frozen and blocked, so that the crystallization condition of water in the rectification separation tower can be obviously improved, the freezing and blocking condition of water in the rectification separation tower is solved, the relative volatility difference of the methanol and the carbon dioxide is large, the methanol can be automatically separated in the rectification separation system, and the product quality cannot be influenced.
Description
Technical Field
The invention belongs to the technical field of carbon dioxide rectification separation, and particularly relates to a device and a method for preventing a system from being frozen and blocked in a carbon dioxide double-tower rectification separation system.
Background
At present, the industrial production of carbon dioxide mainly utilizes industrial carbon-containing waste gas (CO)2Content > 80%) of the extract. The exhaust gas contains CO2In addition, it may contain trace amounts of water. The dehydration in the traditional process mainly utilizes a molecular sieve which is a porous aluminosilicate crystal, and the crystal structure has a large number of cavities with large surface area, generally 600-1000m2The molecular sieve has strong adsorption capacity. Because water is polar molecule and the diameter of molecule is smaller than the aperture of molecular sieve, it is easy to be absorbed. The raw material gas-water content can be lower than 2ppm by molecular sieve dehydration. However, the molecular sieve dehydration process has several disadvantages compared with the rectification separation process: 1. the equipment investment is large, and the construction cost is high; 2. the molecular sieve needs to be replaced again in two to three years on average, and the molecular sieve tower is operated at the same time, so that the air blowing of a fan and the regeneration of an electric heater are needed, and the maintenance and operation cost is high; 3. the feed gas generates larger resistance through the molecular sieve tower, so that the operation load of the system can be increased, and the yield of the system is reduced; 4. the process flow is complex and the operation is complex.
Carbon dioxide double tower rectification utilizes water and the different mesh that reaches the separation of carbon dioxide relative volatility, it also has a problem in production, exactly be too high when the feed gas water content, reduce behind the uniform temperature, in getting into carbon dioxide rectification piece-rate system, the hydrone can form cage type crystal nucleus, and begin the crystallization with this crystal nucleus, along with the growth of crystallization, the deposit can reduce the porosity of tower filler or column plate, the initial stage can reduce the separation efficiency of tower, can take place the flooding when the later stage is serious, the condition such as tower stifled, because whole rectification system is in low temperature operation, the difficult thawing of system after the tower stifled, it brings very big trouble to overhaul for the later stage.
Disclosure of Invention
The invention aims to solve the problems of liquid flooding, tower blockage and the like caused by the fact that the porosity of a tower plate is reduced due to the fact that a raw material gas containing water is easy to crystallize in the existing carbon dioxide double-tower rectification technology, and provides a device and a method for preventing the system from being frozen and blocked in a carbon dioxide double-tower rectification separation system, which solve the problem that water is frozen and blocked in a rectification separation tower.
The technical scheme adopted by the invention is as follows:
a device for preventing a system from being frozen and blocked in a carbon dioxide double-tower rectification separation system comprises at least one antifreezing drip tank, wherein the antifreezing drip tank is communicated with a feed gas conveying pipeline in front of a rectification separation tower in a parallel connection mode.
Furthermore, a plurality of anti-freezing drip pots are connected in parallel and then communicated with the feed gas conveying pipeline in a parallel mode.
Further, the anti-freezing drip tank includes parallelly connected first anti-freezing drip tank and the anti-freezing drip tank of second, first anti-freezing drip tank middle part links to each other with feed gas pipeline through the pipeline that is equipped with first valve, first anti-freezing drip tank bottom links to each other with feed gas pipeline through the pipeline that is equipped with the third valve, make first anti-freezing drip tank and feed gas pipeline form parallel structure, the anti-freezing drip tank of second links to each other with feed gas pipeline through the pipeline that is equipped with the second valve, the anti-freezing drip tank bottom of second links to each other with feed gas pipeline through the pipeline that is equipped with the fourth valve, make the anti-freezing drip tank of second and feed gas pipeline form parallel structure, first anti-freezing drip tank top is connected with the inhibitor that sets up the seventh valve and adds the pipeline and set up the pressure release pipeline of fifth valve, the anti-freezing drip tank top of second is connected with the inhibitor that sets up the eighth valve and adds the pipeline.
Furthermore, at least one U-shaped bent part is arranged on the pipeline part between the anti-freezing drip tank and the rectification separation tower.
Further, the anti-freezing drip tank is filled with liquid methanol.
The invention also provides a method for preventing the system from freezing and blocking in the carbon dioxide double-tower rectification separation system, which comprises the following steps:
⑴ two antifreezing drip pots are added before the raw material gas enters the rectification separation tower and are divided into a first antifreezing drip pot and a second antifreezing drip pot, the two antifreezing drip pots are connected in parallel with the raw material gas inlet pipeline and then are connected in parallel with the raw material gas inlet pipeline;
⑵ closing the first valve, the third valve and the fifth valve at the beginning, opening the seventh valve, filling inhibitor into the tube from the seventh valve, closing the seventh valve, opening the first valve, pressurizing the drip tank, opening the third valve after the pressurization is balanced, dripping the inhibitor into the pipeline to mix with the feed gas, mixing the feed gas and the inhibitor uniformly, and feeding the mixed feed gas into the rectification separation tower;
⑶ when the inhibitor in the first antifreeze drip tank is used up, the second antifreeze drip tank is operated according to the operation method of step ⑵, the fourth valve of the second antifreeze drip tank is opened for drip, the third valve is closed, the fifth valve is opened for pressure relief after the first antifreeze drip tank is closed, the fifth valve is closed after the pressure is exhausted, the seventh valve is opened for adding the inhibitor again, and the first antifreeze drip tank and the second antifreeze drip tank are used alternately.
Further, the inhibitor is liquid methanol.
Further, when the water content of the raw material gas is 100ppm, the amount of the added methanol is 4-5 drops/second.
Compared with the prior art, the invention has the beneficial effects that: set up in carbon dioxide double-tower rectification piece-rate system and prevent that the system from freezing stifled device, freeze stifled device through preventing the system and to carbon dioxide double-tower rectification piece-rate system dropwise add methyl alcohol, methyl alcohol can obviously improve the water in the rectification separation tower crystallization condition to solve the water and freeze stifled condition in the rectification separation tower, and methyl alcohol and carbon dioxide relative volatility difference are big, and methyl alcohol can autosegregation at the rectification separation system, can not influence product quality.
Drawings
FIG. 1 is a schematic structural diagram of a device for preventing freezing and blocking of a system in a carbon dioxide double-tower rectification separation system.
The labels in the figure are: 1-a first valve, 2-a second valve, 3-a third valve, 4-a fourth valve, 5-a fifth valve, 6-a sixth valve, 7-a seventh valve, 8-an eighth valve, 9-a first anti-freezing drip tank, 10-a second anti-freezing drip tank and 11-a rectifying and separating tower.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Example 1
The utility model provides a prevent system freeze stifled device among carbon dioxide double-tower rectification piece-rate system, includes parallelly connected first anti-freezing instillation jar 9 and second anti-freezing instillation jar 10, anti-freezing instillation jar communicates with the feed gas pipeline before the rectification separation tower 11 in parallel connection again after mutually connecting in parallel, and anti-freezing instillation jar communicates with the feed gas pipeline in parallel connection. First anti-freezing drip jar 9 middle part links to each other with feed gas conveying pipe through the pipeline that is equipped with first valve 1, first anti-freezing drip jar 9 bottom links to each other with feed gas conveying pipe through the pipeline that is equipped with third valve 3, make first anti-freezing drip jar 9 and feed gas conveying pipe form parallel structure, second anti-freezing drip jar 10 links to each other with feed gas conveying pipe through the pipeline that is equipped with second valve 2, second anti-freezing drip jar 10 bottom links to each other with feed gas conveying pipe through the pipeline that is equipped with fourth valve 4, make second anti-freezing drip jar 10 and feed gas conveying pipe form parallel structure, first anti-freezing drip jar 9 top is connected with the inhibitor that sets up seventh valve 7 and adds the pipeline and set up the pressure release pipeline of fifth valve 5, second anti-freezing drip jar 10 top is connected with the inhibitor that sets up eighth valve 8 and adds the pipeline and sets up the pressure release pipeline of sixth valve 6. The pipeline part between the anti-freezing drip tank and the rectifying and separating tower 11 is provided with a U-shaped bent part. The anti-freezing drip tank is filled with liquid methanol.
Example 2
A method for preventing a system from being frozen and blocked in a carbon dioxide double-tower rectification separation system comprises the following steps:
⑴ two antifreezing drip pots are added before the raw material gas enters the rectification separation tower and are divided into a first antifreezing drip pot and a second antifreezing drip pot, the two antifreezing drip pots are connected in parallel with the raw material gas inlet pipeline and then are connected in parallel with the raw material gas inlet pipeline;
⑵ closing the first valve, the third valve and the fifth valve at the beginning, opening the seventh valve, filling inhibitor into the tube from the seventh valve, closing the seventh valve, opening the first valve, pressurizing the drip tank, opening the third valve after the pressurization is balanced, dripping the inhibitor into the pipeline to mix with the feed gas, mixing the feed gas and the inhibitor uniformly, and feeding the mixed feed gas into the rectification separation tower;
⑶ when the inhibitor in the first antifreeze drip tank is used up, the second antifreeze drip tank is operated according to the operation method of step ⑵, the fourth valve of the second antifreeze drip tank is opened for drip, the third valve is closed, the fifth valve is opened for pressure relief after the first antifreeze drip tank is closed, the fifth valve is closed after the pressure is exhausted, the seventh valve is opened for adding the inhibitor again, and the first antifreeze drip tank and the second antifreeze drip tank are used alternately.
The inhibitor is liquid methanol.
Example 3
Based on examples 1 and 2, the feed gas pressure is generally 2.4MPa in normal use, and the amount of methanol added is determined according to the water content in the feed gas components, so as to produce 7 tons of CO per hour2For example, when the gas-water content of the raw material is 100ppm, the amount of the added methanol is 4-5 drops/second.
Methanol is used as an excellent water crystallization inhibitor, and alcoholic hydroxyl of the methanol can form hydrogen bonds with water molecules to hinder the growth of crystallization, so that the methanol can obviously improve the crystallization condition of water in a rectification separation tower, and finally the water molecules are separated in the rectification separation process, thereby solving the problem of freezing and blocking of the water in the rectification separation tower. Meanwhile, the relative volatility of carbon dioxide is 1, the relative volatility of methanol is 0.00841, and the difference between the relative volatility of carbon dioxide and methanol is large, so that methanol can be discharged from the bottom of the tower along with other heavy components in the rectification separation process, and the product quality cannot be influenced.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (8)
1. The utility model provides a prevent among carbon dioxide double-tower rectification piece-rate system device that system freezes stifled which characterized in that: comprises at least one antifreezing drip tank, and the antifreezing drip tank is communicated with a feed gas conveying pipeline in front of the rectification separation tower in a parallel mode.
2. The apparatus of claim 1, wherein: a plurality of anti-freezing drip pots are connected in parallel and then communicated with the feed gas conveying pipeline in a parallel mode.
3. The apparatus of claim 2, wherein: the anti-freezing drip tank comprises a first anti-freezing drip tank and a second anti-freezing drip tank which are connected in parallel, the middle of the first anti-freezing drip tank is connected with a feed gas conveying pipeline through a pipeline provided with a first valve, the bottom of the first anti-freezing drip tank is connected with the feed gas conveying pipeline through a pipeline provided with a third valve, the first anti-freezing drip tank and the feed gas conveying pipeline form a parallel structure, the second anti-freezing drip tank is connected with the feed gas conveying pipeline through a pipeline provided with a second valve, the bottom of the second anti-freezing drip tank is connected with the feed gas conveying pipeline through a pipeline provided with a fourth valve, the second anti-freezing drip tank and the feed gas conveying pipeline form a parallel structure, the top of the first anti-freezing drip tank is connected with an inhibitor adding pipeline provided with a seventh valve and a pressure relief pipeline provided with a fifth valve, and the top of the second anti-freezing drip tank is connected with an inhibitor adding pipeline.
4. The apparatus of claim 1, wherein: at least one U-shaped bent part is arranged on the pipeline part between the anti-freezing drip tank and the rectification separation tower.
5. The apparatus of claim 1, wherein: the anti-freezing drip tank is filled with liquid methanol.
6. A method for preventing a system from being frozen and blocked in a carbon dioxide double-tower rectification separation system is characterized by comprising the following steps:
⑴ two antifreezing drip pots are added before the raw material gas enters the rectification separation tower and are divided into a first antifreezing drip pot and a second antifreezing drip pot, the two antifreezing drip pots are connected in parallel with the raw material gas inlet pipeline and then are connected in parallel with the raw material gas inlet pipeline;
⑵ closing the first valve, the third valve and the fifth valve at the beginning, opening the seventh valve, filling inhibitor into the tube from the seventh valve, closing the seventh valve, opening the first valve, pressurizing the drip tank, opening the third valve after the pressurization is balanced, dripping the inhibitor into the pipeline to mix with the feed gas, mixing the feed gas and the inhibitor uniformly, and feeding the mixed feed gas into the rectification separation tower;
⑶ when the inhibitor in the first antifreeze drip tank is used up, the second antifreeze drip tank is operated according to the operation method of step ⑵, the fourth valve of the second antifreeze drip tank is opened for drip, the third valve is closed, the fifth valve is opened for pressure relief after the first antifreeze drip tank is closed, the fifth valve is closed after the pressure is exhausted, the seventh valve is opened for adding the inhibitor again, and the first antifreeze drip tank and the second antifreeze drip tank are used alternately.
7. The method of claim 1, wherein: the inhibitor is liquid methanol.
8. The method of claim 1, wherein: when the water content of the feed gas is 100ppm, the amount of the added methanol is 4-5 drops/second.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010168965.7A CN111228841A (en) | 2020-03-12 | 2020-03-12 | Device and method for preventing system freezing and blocking in carbon dioxide double-tower rectification separation system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010168965.7A CN111228841A (en) | 2020-03-12 | 2020-03-12 | Device and method for preventing system freezing and blocking in carbon dioxide double-tower rectification separation system |
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| CN111228841A true CN111228841A (en) | 2020-06-05 |
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Application publication date: 20200605 |