CN213631178U - Carbon dioxide purification liquefying plant - Google Patents
Carbon dioxide purification liquefying plant Download PDFInfo
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- CN213631178U CN213631178U CN202022110153.5U CN202022110153U CN213631178U CN 213631178 U CN213631178 U CN 213631178U CN 202022110153 U CN202022110153 U CN 202022110153U CN 213631178 U CN213631178 U CN 213631178U
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Abstract
The utility model discloses a carbon dioxide purification liquefying plant belongs to carbon dioxide purification liquefaction technical field. The device comprises a dehydrating tower and a purifying tower, wherein raw material carbon dioxide enters a gas-liquid separator after being subjected to heat exchange by a raw material gas heat exchanger, a gas phase output pipeline of the gas-liquid separator is connected with the dehydrating tower, and a liquid phase output pipeline is connected with a three-phase separation tank; an output end at the top of the dehydration tower is connected with the purification tower, and a gas output end at the top of the purification tower is connected with the upper part of the purification tower sequentially through a purification tower top condenser, a purification tower top reflux tank and a purification tower top reflux pump; and the liquid phase output end at the bottom of the purification tower is connected with a finished product intermediate tank. The device obtains industrial-grade liquid carbon dioxide.
Description
Technical Field
The utility model relates to a carbon dioxide purification liquefaction technical field relates to an industrial grade carbon dioxide purification liquefaction device.
Background
The industrial-grade liquid carbon dioxide is widely applied and mainly used for welding shielding gas, oil displacement by a carbon dioxide injection method, explosion suppression, fire fighting, fire extinguishing additive, dry ice, coal mine fire extinguishing and the like. The technical requirements of industrial carbon dioxide are in accordance with the regulations of GB/T6052 in Table 1. The natural carbon dioxide feed gas from a carbon dioxide field contains about 0.5% water and 0.3% light crude oil. The carbon dioxide containing water can form acid, so that the acid corrodes equipment and pipelines, is unfavorable for storage and transportation of the carbon dioxide and must be removed to a certain content; the light crude oil contains wax, is easy to adhere to the inner walls of equipment and pipelines, and also needs to be separated; in addition, the raw material gas contains components with boiling points lower than that of carbon dioxide, such as methane, nitrogen and the like, if the components are not processed, the liquefaction temperature of the carbon dioxide is influenced, and under the same pressure, the more the carbon dioxide contains low-boiling-point components, the lower the liquefaction temperature of the carbon dioxide is, the higher the consumed energy is, and therefore the low-boiling-point components such as methane, nitrogen and the like are also removed to be within a certain range.
SUMMERY OF THE UTILITY MODEL
The utility model provides a carbon dioxide purification liquefying plant aiming at the technical problem.
The purpose of the utility model can be realized by the following technical scheme:
a carbon dioxide purification and liquefaction device comprises a dehydration tower and a purification tower, wherein raw material carbon dioxide enters a gas-liquid separator after being subjected to heat exchange by a raw material gas heat exchanger, a gas phase output pipeline of the gas-liquid separator is connected with the dehydration tower, and a liquid phase output pipeline is connected with a three-phase separation tank;
an output end at the top of the dehydration tower is connected with the purification tower, and a gas output end at the top of the purification tower is connected with the upper part of the purification tower sequentially through a purification tower top condenser, a purification tower top reflux tank and a purification tower top reflux pump; and the liquid phase output end at the bottom of the purification tower is connected with a finished product intermediate tank.
The utility model discloses among the technical scheme: the raw material carbon dioxide is mixed with the carbon dioxide at the bottom of the dehydrating tower, and then enters the gas-liquid separator after heat exchange of the raw material gas heat exchanger.
The utility model discloses among the technical scheme: and a liquid phase output pipeline of the gas-liquid separator exchanges heat through the condensate heat exchanger and then enters the three-phase separation tank.
The utility model discloses among the technical scheme: the gas phase output end of the three-phase separation tank is connected with the incinerator, the water phase output end is connected with the sewage pump through the sewage tank, the sewage pump is connected with the sewage treatment system, and the oil phase output end is connected with the precipitated oil tank and is conveyed to the truck through the precipitated oil pump.
The utility model discloses among the technical scheme: and one output end at the top of the dehydration tower is sequentially connected with the carbon dioxide condenser and the purification tower after passing through the dehydration device or without passing through the dehydration device.
The utility model discloses among the technical scheme: and the gas output end at the top of the purification tower top reflux tank is connected with a tail gas incinerator through a tail gas heat exchanger.
The utility model discloses among the technical scheme: and a reboiler at the bottom of the purification tower is arranged at the bottom of the purification tower.
The utility model discloses among the technical scheme: and the other output end at the top of the dehydration tower is connected with the upper part of the dehydration tower sequentially through a dehydration tower top condenser, a dehydration tower top reflux tank and a dehydration tower top reflux pump.
The utility model discloses among the technical scheme: the output end of the top of the finished product intermediate tank is connected with the lower part of the purification tower, one output end of the bottom of the finished product intermediate tank is connected with the condenser at the top of the purification tower, the carbon dioxide is sequentially conveyed to the carbon dioxide superheater, the carbon dioxide compressor and the tail gas heat exchanger after coming out of the condenser at the top of the purification tower, the other output end of the bottom of the finished product intermediate tank is connected with the carbon dioxide storage tank, and the gas output end of.
The strand of carbon dioxide comes out from the tail gas heat exchanger, is mixed with gas at the output end of the top of the dehydration tower through the condensate heat exchanger and the carbon dioxide cooler in sequence, and then enters the purification tower after being condensed by the carbon dioxide condenser.
The utility model has the advantages that:
the utility model provides a carbon dioxide purification and liquefaction device and method, which obtain industrial liquid carbon dioxide.
Drawings
FIG. 1 is a process flow diagram of a carbon dioxide purification liquefaction plant;
in the figure, 1, a raw material gas heat exchanger, 2, a gas-liquid separator, 3, a dehydrating tower, 4, a dehydrating tower top condenser, 5, a dehydrating tower top reflux tank, 6, a dehydrating tower top reflux pump, 7, a carbon dioxide booster pump, 8, a condensate heat exchanger, 9, a three-phase separation tank, 10, a sewage tank, 11, a separated oil tank, 12, a sewage pump, 13, a separated oil pump, 14, a carbon dioxide cooler and 15, a carbon dioxide condenser. 16, a purifying tower, 17, a reboiler at the bottom of the purifying tower, 18, a condenser at the top of the purifying tower, 19, a reflux tank at the top of the purifying tower, 20, a reflux pump at the top of the purifying tower, 21, a carbon dioxide superheater, 22, a carbon dioxide compressor, 23, a tail gas heat exchanger, 24, a finished product intermediate tank, 25, a carbon dioxide storage tank and 26, a carbon dioxide loading pump and 27, and a tail gas incinerator.
Detailed Description
The present invention will be further explained with reference to the following embodiments, but the scope of the present invention is not limited thereto:
referring to fig. 1, a carbon dioxide purification and liquefaction device comprises a dehydration tower 3 and a purification tower 16, wherein raw carbon dioxide enters a gas-liquid separator 2 after being subjected to heat exchange by a raw gas heat exchanger 1, a gas phase output pipeline of the gas-liquid separator 2 is connected with the dehydration tower 3, and a liquid phase output pipeline is connected with a three-phase separation tank 9;
an output end at the top of the dehydrating tower 3 is connected with a purifying tower 16, and a gas output end at the top of the purifying tower 16 is connected with the upper part of the purifying tower 16 through a purifying tower top condenser 18, a purifying tower top reflux tank 19 and a purifying tower top reflux pump 20 in sequence; the liquid phase output end at the bottom of the purifying tower 16 is connected with a finished product intermediate tank 24.
The raw material carbon dioxide is mixed with the carbon dioxide at the bottom of the dehydrating tower 3, and then enters the gas-liquid separator 2 after heat exchange is carried out by the raw material gas heat exchanger 1.
And a liquid phase output pipeline of the gas-liquid separator 2 exchanges heat through a condensate heat exchanger 8 and then enters a three-phase separation tank 9.
The gas phase output end of the three-phase separation tank 9 is connected with the incinerator 27, the water phase output end is connected with the sewage pump 12 through the sewage tank 10, the sewage pump 12 is connected with the sewage treatment system, the oil phase output end is connected with the precipitated oil tank 11, and the precipitated oil pump 13 is used for conveying the oil to a loading truck.
And an output end at the top of the dehydration tower 3 is sequentially connected with a carbon dioxide condenser 15 and a purification tower 16 after passing through a dehydration device or without passing through the dehydration device.
The gas output end at the top of the purification tower top reflux tank 19 is connected with a tail gas incinerator 27 through a tail gas heat exchanger 23.
The bottom of the purifying tower 16 is provided with a purifying tower bottom reboiler 17.
And the other output end at the top of the dehydration tower 3 is connected with the upper part of the dehydration tower 3 sequentially through a dehydration tower top condenser 4, a dehydration tower top reflux tank 5 and a dehydration tower top reflux pump 6.
The output end of the top of the finished product intermediate tank 24 is connected with the lower part of the purification tower 16, one output end of the bottom is connected with the purification tower top condenser 18, the carbon dioxide is delivered to the carbon dioxide superheater 21, the carbon dioxide compressor 22 and the tail gas heat exchanger 23 in sequence after coming out of the purification tower top condenser 18, the other output end of the bottom is connected with the carbon dioxide storage tank 25, and the gas output end of the top of the carbon dioxide storage tank 25 is connected with the carbon dioxide superheater 21.
The strand of carbon dioxide is mixed with the gas at the output end of the top of the dehydration tower 3 from the tail gas heat exchanger 23 through the condensate heat exchanger 8 and the carbon dioxide cooler 14 in sequence, and then is condensed by the carbon dioxide condenser 15 and enters the purification tower 16.
The application case is as follows:
taking a 35 ten thousand tons/year industrial-grade carbon dioxide purification and liquefaction device in a certain plant as an example, 23795Nm from a gas field3The feed gas of carbon dioxide at 30 ℃ is 7.2MPaG, and the molar composition of the feed gas is CO2：97.828％、CH4:0.9％、N2：0.2％、 H2O:0.5％、C2H6:0.04％、C3H8:0.02％、i-C4H10：0.004％、n-C4H10：0.003％、i-C5H12： 0.002％、n-C5H12：0.002％、C6H14: 0.5%, HCl: 0.01 percent. The wastewater is decompressed to 4.4MPaG, then is mixed with carbon dioxide at the bottom of a dehydration tower, the temperature of the wastewater is raised to 19.4 ℃ by a feed gas heat exchanger 1, then the wastewater enters a gas-liquid separator 2, the gas phase enters a dehydration tower 3, the liquid phase exchanges heat by a condensate heat exchanger 8 and then enters a three-phase separation tank 9, the gas phase of the three-phase separation tank 9 enters an incinerator 27, a water phase decontamination water tank 10 is used for delivering sewage to be treated by a sewage pump 12 after reaching a certain liquid level, the oil phase enters a separation oil tank 11, and the wastewater is loaded to a boundary area by a separation oil pump.
The operation pressure at the top of the dehydrating tower 3 is 4.35MPaG, the temperature is 9 ℃, the gas phase at the top is divided into two strands, one strand is condensed to 1 ℃ by a condenser 4 at the top of the dehydrating tower and enters a reflux tank 5 at the top of the dehydrating tower, the liquid phase of the reflux tank 5 is pressurized by a reflux pump 6 and then is sent to the top of the dehydrating tower, and the non-condensable gas in the reflux tank 5 is sent to an incinerator 27; the other gas phase at the top of the dehydration tower 3 goes to a purification tower. And a liquid phase at the bottom of the dehydrating tower 3 passes through a carbon dioxide booster pump 7, one part of the liquid phase returns to the bottom of the dehydrating tower to control the liquid level at the bottom of the dehydrating tower, and the other part of the liquid phase is converged with the raw material carbon dioxide.
The gas from the top of the dehydration tower 3 is condensed by a carbon dioxide condenser 15 (if industrial high-grade liquid carbon dioxide is required to be obtained, the gas is firstly processed by a dehydration device), the temperature is about 2 ℃, the gas enters a purification tower 16, the operation pressure at the top of the tower is 4.02MPaG, the temperature is-0.9 ℃, the gas phase at the top of the tower is condensed by a purification tower top condenser 18, the temperature is about-20 ℃, the gas phase at the top of the purification tower enters a purification tower top reflux tank 19, the gas phase at the top of the tank is heated to 65 ℃ by a tail gas heat exchanger 23 and is sent to a tail gas incinerator 27, and the liquid phase at the. A reboiler 17 at the bottom of the purification tower provides a heat source for the dehydration tower, the liquid phase at the bottom of the purification tower enters a finished product intermediate tank 24, and most of the liquid phase enters a carbon dioxide storage tank 25; a small part of the gas is decompressed to 1.8MPaG, the temperature is reduced to-21.5 ℃, a cold source is provided for a condenser 18 at the top of the purification tower, the gas is mixed with the carbon dioxide flashed out from a carbon dioxide storage tank 25, superheated to 3 ℃ through a carbon dioxide superheater 21, sent to a carbon dioxide compressor 22 and pressurized to 4.4MPaG, the temperature of the pressurized gas is raised to 87.7 ℃, and then cooled to 40 ℃ through a carbon dioxide cooler 14 to be mixed with the gas phase at the top of the dehydration tower 3.
The finished product industrial grade liquid carbon dioxide obtained in the carbon dioxide storage tank 25 is pumped out by a carbon dioxide truck-loading pump.
Claims (10)
1. A carbon dioxide purification liquefaction device which characterized in that: the device comprises a dehydration tower (3) and a purification tower (16),
raw material carbon dioxide enters a gas-liquid separator (2) after being subjected to heat exchange by a raw material gas heat exchanger (1), a gas phase output pipeline of the gas-liquid separator (2) is connected with a dehydration tower (3), and a liquid phase output pipeline is connected with a three-phase separation tank (9);
an output end at the top of the dehydration tower (3) is connected with a purification tower (16), and a gas output end at the top of the purification tower (16) is connected with the upper part of the purification tower (16) through a purification tower top condenser (18), a purification tower top reflux tank (19) and a purification tower top reflux pump (20) in sequence; and the liquid phase output end at the bottom of the purifying tower (16) is connected with a finished product intermediate tank (24).
2. The carbon dioxide purification and liquefaction device according to claim 1, characterized in that: the raw material carbon dioxide is mixed with the carbon dioxide at the bottom of the dehydrating tower (3), and then enters the gas-liquid separator (2) after heat exchange by the raw material gas heat exchanger (1).
3. The carbon dioxide purification and liquefaction device according to claim 1, characterized in that: and a liquid phase output pipeline of the gas-liquid separator (2) enters a three-phase separation tank (9) after heat exchange through a condensate heat exchanger (8).
4. The carbon dioxide purification and liquefaction device according to claim 1, characterized in that: the gas phase output end of the three-phase separation tank (9) is connected with the incinerator (27), the water phase output end is connected with a sewage pump (12) through a sewage tank (10), the sewage pump (12) is connected with a sewage treatment system, and the oil phase output end is connected with a precipitation oil tank (11) and is conveyed to a loading machine through a precipitation oil pump (13).
5. The carbon dioxide purification and liquefaction device according to claim 1, characterized in that: and an output end at the top of the dehydration tower (3) is sequentially connected with a carbon dioxide condenser (15) and a purification tower (16) after passing through a dehydration device or without passing through the dehydration device.
6. The carbon dioxide purification and liquefaction device according to claim 1, characterized in that: and the gas output end at the top of the purification tower top reflux tank (19) is connected with a tail gas incinerator (27) through a tail gas heat exchanger (23).
7. The carbon dioxide purification and liquefaction device according to claim 1, characterized in that: the bottom of the purifying tower (16) is provided with a reboiler (17) at the bottom of the purifying tower.
8. The carbon dioxide purification and liquefaction device according to claim 1, characterized in that: and the other output end at the top of the dehydration tower (3) is connected with the upper part of the dehydration tower (3) sequentially through a dehydration tower top condenser (4), a dehydration tower top reflux tank (5) and a dehydration tower top reflux pump (6).
9. The carbon dioxide purification and liquefaction device according to claim 1, characterized in that: the output end of the top of the finished product intermediate tank (24) is connected with the lower part of the purification tower (16), one output end of the bottom of the finished product intermediate tank is connected with the purification tower top condenser (18), the carbon dioxide is delivered to the carbon dioxide superheater (21), the carbon dioxide compressor (22) and the tail gas heat exchanger (23) in sequence after coming out of the purification tower top condenser (18), the other output end of the bottom of the finished product intermediate tank is connected with the carbon dioxide storage tank (25), and the gas output end of the top of the carbon dioxide storage tank (25) is connected with the carbon.
10. The carbon dioxide purification and liquefaction device according to claim 9, characterized in that: the strand of carbon dioxide is discharged from the tail gas heat exchanger (23) and sequentially passes through the condensate heat exchanger (8), the carbon dioxide cooler (14) and the gas at the output end of the top of the dehydration tower (3) to be mixed, and then is condensed by the carbon dioxide condenser (15) and enters the purification tower (16).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022110153.5U CN213631178U (en) | 2020-09-23 | 2020-09-23 | Carbon dioxide purification liquefying plant |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202022110153.5U CN213631178U (en) | 2020-09-23 | 2020-09-23 | Carbon dioxide purification liquefying plant |
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| CN213631178U true CN213631178U (en) | 2021-07-06 |
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| CN202022110153.5U Active CN213631178U (en) | 2020-09-23 | 2020-09-23 | Carbon dioxide purification liquefying plant |
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