CN111849578A - Containing CO at a high concentration2Device and process for gas decarburization and amine liquid regeneration - Google Patents
Containing CO at a high concentration2Device and process for gas decarburization and amine liquid regeneration Download PDFInfo
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- CN111849578A CN111849578A CN202010842134.3A CN202010842134A CN111849578A CN 111849578 A CN111849578 A CN 111849578A CN 202010842134 A CN202010842134 A CN 202010842134A CN 111849578 A CN111849578 A CN 111849578A
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
- C10L3/00—Gaseous fuels; Natural gas; Synthetic natural gas obtained by processes not covered by subclass C10G, C10K; Liquefied petroleum gas
- C10L3/06—Natural gas; Synthetic natural gas obtained by processes not covered by C10G, C10K3/02 or C10K3/04
- C10L3/10—Working-up natural gas or synthetic natural gas
- C10L3/101—Removal of contaminants
- C10L3/102—Removal of contaminants of acid contaminants
- C10L3/104—Carbon dioxide
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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
- B01D3/06—Flash distillation
- B01D3/065—Multiple-effect flash distillation (more than two traps)
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- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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- B01D3/00—Distillation or related exchange processes in which liquids are contacted with gaseous media, e.g. stripping
- B01D3/42—Regulation; Control
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
- B01D53/1456—Removing acid components
- B01D53/1475—Removing carbon dioxide
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
- B01D53/18—Absorbing units; Liquid distributors therefor
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2252/00—Absorbents, i.e. solvents and liquid materials for gas absorption
- B01D2252/20—Organic absorbents
- B01D2252/204—Amines
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The invention discloses a high-concentration CO-containing catalyst2A device and a process for gas decarburization and amine liquid regeneration. The device comprises an absorption tower, an amine liquid primary flash tower, an amine liquid secondary flash tower, a purified gas cooler, a lean/rich amine liquid heat exchanger, a lean amine liquid cooler, an amine liquid filter, an absorption tower cleaning pump, a feed pump, an amine liquid circulating pump, a purified gas-liquid separator, a feed tank, a solution buffer tank, a liquid seal tank and an adjusting valve. Is suitable for the process of regenerating amine liquid after the decarbonization of high-acid natural gas or synthetic gas with acid gas content of 35 percent (mole percent), and the carbon content of purified gas is controlled to be not higher than 25% (mole%). The device of the invention uses the primary flash tower and the secondary flash tower of the amine liquid to replace the regeneration tower, only provides partial heat at the lower part of the primary flash tower, greatly reduces the heat extraction amount and reduces the energy consumption of the device; the traditional rich amine liquid flash tank is replaced by the first-stage flash tower, and the second-stage flash tower enables the flow to be free from arranging a carbon dioxide gas-liquid separator and a regeneration tower reflux pump, so that the number of equipment is greatly reduced, and the flow is greatly simplified.
Description
Technical Field
The invention relates to a device and a process for decarbonization and amine liquid regeneration, in particular to a device containing high-concentration CO2Device and process for gas decarburization and amine liquid regeneration, and is suitable for CO in natural gas or synthetic gas2The gas with the content less than or equal to 35 percent (mole percent) is decarbonized, and CO in the purified gas after treatment2Content (wt.)<2.5％(mole％)。
Background
Syngas and natural gas produced from subterranean formations typically contain some CO2And the like. According to the index requirements of commodity natural gas in China, CO2The content of the CO is less than 3 percent (mole percent) for being exported to civil users, so the CO content is high2Natural substance (such as natural gas)The gas needs to be decarbonized. At present, the common decarburization methods at home and abroad include a low-temperature separation method, a membrane separation method, an adsorption separation method, a solvent absorption method, a combined separation method of the above methods, and the like.
The low-temperature separation method is suitable for occasions with high acid gas content but low purification degree requirement, and has complex process and high energy consumption caused by great temperature reduction. The membrane separation method is suitable for removing acid gas and water from high carbon-containing natural gas in a rough way, and generally industrially, the membrane separation method is firstly applied to carry out rough removal on the high carbon-containing natural gas, and then a chemical solvent method is applied to carry out fine removal, so that high purification degree can be achieved, and the method is economical. Although the membrane separation method has the advantages of low energy consumption, small occupied area, convenient maintenance, high efficiency, environmental protection, energy conservation and the like, the hydrocarbon loss rate is higher by adopting the method. The adsorption separation method is suitable for occasions with small treatment capacity, low carbon content and high purification requirement.
The solvent absorption method is still one of the most mature and extensive decarburization methods in current application. The solvent absorption method is further classified into a chemical absorption method, a physical absorption method and a mixed solvent method. Among various solvent absorption methods, the alcohol amine method is most widely used. Among various alcohol amine methods, the activated MDEA process is most advocated because of the characteristics of high use concentration, high acid gas load, low corrosivity, difficult degradation, small volatilization loss and the like.
Disclosure of Invention
The invention provides a high-concentration CO-containing catalyst2Device and process for gas decarburization and amine liquid regeneration, and is suitable for CO in natural gas or synthetic gas2Gas decarbonization process with content less than or equal to 35% (mole%), purified gas CO2Content (wt.)<2.5% (mole%). The device is provided with a primary amine liquid flash tower and a secondary amine liquid flash tower, and is not provided with a regeneration tower, a rich amine liquid flash tank and CO2A gas-liquid separator and a regeneration tower reflux pump. The invention provides a high CO content medium and a method for regenerating MDEA (medium density polyethylene) by taking the characteristics of mainly reducing pressure and assisting in heating2Compared with the traditional activated MDEA decarburization process, the novel process for gas decarburization provided by the invention optimizes the amine liquid regeneration process, and has the multiple advantages of low energy consumption, small equipment quantity, simple process and large acid gas load。
According to a first aspect of the present invention, there is provided a catalyst composition comprising a high concentration of CO2The device comprises an absorption tower for purifying high-acid raw gas, an amine liquid primary flash tower for primarily desorbing rich amine liquid (amine liquid for absorbing acid gas), an amine liquid secondary flash tower for secondarily desorbing the rich amine liquid, a purified gas cooler for cooling purified gas, a lean/rich amine liquid heat exchanger for heating the rich amine liquid and primarily cooling lean amine liquid (amine liquid after desorption), a lean amine liquid cooler for secondarily cooling the lean amine liquid, a solution buffer tank for temporarily storing the lean amine liquid, an amine liquid circulating pump for pumping the amine liquid in the solution buffer tank into the absorption tower, an amine liquid filter for purifying the lean amine liquid entering the absorption tower, a purified gas-liquid separator for separating free water carried by the purified gas, an absorption tower cleaning pump for pumping liquid output by the purified gas-liquid separator into the absorption tower, a water tank for temporarily storing the purified gas-liquid, a water tank for storing the purified gas-liquid, and, A liquid-sealed tank and a regulating valve for emptying the acid gas.
The gas-phase inlet of the absorption tower is connected with a high-acid feed gas input pipeline, a purified gas outlet at the top of the absorption tower is connected with a hot channel inlet of a purified gas cooler through a pipeline, a hot channel outlet of the purified gas cooler is connected with an inlet of a purified gas-liquid separator through a pipeline, a tank top gas-phase outlet of the purified gas-liquid separator is connected to a purified gas output pipeline provided with a first regulating valve, a tank bottom liquid-phase outlet of the purified gas-liquid separator is connected to an inlet of an absorption tower cleaning pump through a pipeline, an output pipeline of the absorption tower cleaning pump is divided into two branch pipes, one branch pipe returns to the purified gas-liquid separator, and the other branch pipe is connected to the upper part;
a liquid phase outlet at the bottom of the absorption tower is connected to a cold flow channel inlet of the lean/rich amine liquid heat exchanger through a third regulating valve, a cold flow channel outlet of the lean/rich amine liquid heat exchanger is connected to a feed inlet at the upper part of the primary amine liquid flash tower through a pipeline, a liquid phase output pipeline at the bottom of the primary amine liquid flash tower is connected to a liquid phase inlet of the secondary amine liquid flash tower through a fourth regulating valve, a gas phase outlet at the top of the primary amine liquid flash tower is connected to a gas phase inlet of the secondary amine liquid flash tower through a fifth regulating valve, and a gas phase outlet at the top of the secondary amine liquid flash tower is connected to a liquid seal tank through a pipeline;
a liquid phase outlet at the bottom of the amine liquid secondary flash tower is connected to a hot flow channel inlet of the lean/rich amine liquid heat exchanger through a pipeline, a hot flow channel outlet of the lean/rich amine liquid heat exchanger is connected to a hot flow channel inlet of the lean amine liquid cooler, a hot flow channel outlet of the lean amine liquid cooler is connected to a solution buffer tank through a pipeline, an amine liquid output pipeline of the solution buffer tank is divided into a plurality of branch pipes after passing through an amine liquid circulating pump, one branch pipe is connected to a liquid phase inlet of the absorption tower, and the other branch pipe is connected to an inlet pipeline from the solution buffer tank to the amine liquid circulating pump after passing through a sixth regulating valve and an amine liquid filter in.
By high acid feed gas is meant a feed gas in which CO is present2Natural gas or synthetic gas with the content of more than 15 percent (mole percent) and less than or equal to 35 percent (mole percent).
Further, the gas phase inlet of the absorption tower is positioned at the bottom of the absorption tower, and the liquid phase inlet of the absorption tower is positioned at the upper part of the absorption tower.
Further, the device comprises a feeding tank for storing the defoaming agent or the absorbent, and a feeding pump for providing power for the defoaming agent or the absorbent and pumping the defoaming agent or the absorbent into the solution buffer tank; the liquid phase output pipeline at the bottom of the feeding tank is connected with the solution buffer tank after passing through the feeding pump, and the feeding pump is preferably a pneumatic diaphragm pump. Further, the purified gas cooler, the lean/rich amine liquid heat exchanger and the lean amine liquid cooler are plate type or shell-and-tube type heat exchangers which adopt a circulating water cooling system or an air cooling system.
Furthermore, a heat exchange tube bundle or a plate bundle for heating the amine-rich liquid and using heat conduction oil or steam as a heat medium is arranged in the lower part of the amine liquid primary flash tower, and a heat exchange tube bundle or a plate bundle for cooling the acid gas and using a refrigerant as circulating water is arranged in the upper part of the amine liquid secondary flash tower.
Further, a seventh regulating valve and an eighth regulating valve are respectively arranged on the cold flow output line sides of the purified gas cooler and the lean amine liquid cooler; a heat exchange tube bundle or a plate bundle for heating the amine-rich liquid and taking heat conduction oil or steam as a heat medium is arranged in the lower part of the amine liquid primary flash tower, and a ninth regulating valve is arranged on the side of a heat flow input pipeline; and a heat exchange tube bundle or a plate bundle (used for cooling the acid gas and preferably using the refrigerant as circulating water) is arranged in the upper part of the amine liquid secondary flash tower, and a tenth regulating valve is arranged on the side of a circulating water output pipeline.
Further, the first regulating valve is feedback regulated by a pressure indication controller arranged on the purified gas output line; the second regulating valve is regulated by a liquid level indicating controller arranged in the gas-liquid separator of the purified gas; the third regulating valve is regulated by a liquid level controller arranged in the absorption tower; the fourth regulating valve is regulated by a liquid level indicating controller arranged in the amine liquid primary flash tower; the fifth regulating valve is regulated by a pressure indicating controller arranged on a gas phase outlet pipeline at the top of the amine liquid primary flash tower; the sixth regulating valve is regulated by a flow indicator controller arranged on the other branch pipe branched from the amine liquid output pipeline of the solution buffer tank; the seventh regulating valve is regulated by a temperature-indicating controller disposed on the conduit between the purge gas cooler and the purge gas-liquid separator; the eighth regulating valve is regulated by a temperature indicating controller arranged on a pipeline between the lean amine liquid cooler and the liquid buffer tank; the ninth regulating valve is regulated by a temperature indicating controller arranged on a liquid phase output pipeline at the bottom of the primary amine liquid flash tower; the tenth regulating valve is regulated by a temperature indicating controller arranged on a gas phase outlet pipeline at the top of the amine liquid secondary flash tower.
According to the second aspect of the invention, there is further provided a process for decarbonation and amine liquid regeneration using the apparatus of the invention, comprising CO2The absorption and amine liquid regeneration are carried out by the following specific processes:
(1) the high acid raw material gas enters from the bottom of the absorption tower; the lean amine liquid is sprayed from the upper part of the absorption tower, and after the lean amine liquid and the high-acid feed gas transfer heat and mass in the tower, CO is output from the top of the absorption tower2A concentration of less than 2.5% (mole%) of a purge gas;
(2) the purified gas is cooled by a purified gas cooler and then is conveyed to a purified gas-liquid separator for gas-liquid separation, the gas output from the top of the purified gas-liquid separator is used as a product output device, and the liquid phase obtained by bottom separation returns to the top of the absorption tower;
(3) rich amine liquid output from the bottom of the absorption towerAfter throttling and pressure reduction and temperature rise of the lean/rich amine liquid heat exchanger, the mixture enters an amine liquid primary flash tower, and part of CO is flashed out2The rich amine liquid of the gas is heated by a heat exchange tube bundle or a plate bundle at the lower part of the primary amine liquid flash tower, is output from the bottom of the primary amine liquid flash tower, is throttled and decompressed, then enters from the upper part of the secondary amine liquid flash tower, and further desorbs and sucks CO2Gas, poor amine liquid is output from the bottom of the amine liquid secondary flash tower, the poor amine liquid is cooled to 40-50 ℃ and then is conveyed to a solution buffer tank,
(4) the lean amine liquid pumped out from the bottom of the solution buffer tank is pressurized by an amine liquid circulating pump and then divided into two paths, wherein the first path, namely most of the amine liquid (for example, 60-80 percent of the total lean amine liquid), is directly pumped to the upper part of the absorption tower after being pressurized, the other path returns to an inlet pipeline of the amine liquid circulating pump after being filtered,
(5) part of CO is flashed from the top of the primary amine liquid flash tower2The gas of (2) is decompressed to 0.01-0.06MPa (G), preferably 0.02-0.05MPa (G), then is conveyed to an amine liquid secondary flash tower to be cooled to 35-45 ℃, and is discharged at a high point after being subjected to liquid tank sealing.
In a preferred embodiment, the process comprises:
(1)CO2absorption: high acid feed gas with carbon content less than or equal to 35 percent (mole percent) and temperature of 35-45 ℃ enters from the bottom of the absorption tower and flows from bottom to top; amine liquid (20-40 wt% of aqueous MEDA solution) at about 40-50 ℃ is sprayed from the upper part of the absorption tower (preferably, the volume flow ratio of the high-acid raw material gas to the amine liquid is 24: 1-37: 1), the amine liquid and the high-acid raw material gas flow in the opposite directions from top to bottom through the absorption tower, and after the amine liquid and the high-acid raw material gas fully contact and transfer heat and mass in the tower, CO in the high-acid raw material gas2Absorbed by lean amine liquid, and CO is output from the top of the absorption tower2A concentration of less than 2.5% (mole%) of a purge gas;
(2) cooling purified gas output from the top of the absorption tower by a purified gas cooler (to 36-40 ℃ and about 38 ℃ further), separating carried free water in a purified gas-liquid separator, taking the gas output from the top of the purified gas-liquid separator as a product output device, pressurizing a liquid phase obtained from the bottom of the purified gas-liquid separator by an absorption tower cleaning pump, and returning the liquid phase to the top of the absorption tower;
(3) amine liquid regeneration: the rich amine liquid absorbing the acid gas is output from the bottom of the absorption tower, throttled and depressurized to 0.2-0.6MPa (G), preferably 0.3-0.5MPa (G) by a third regulating valve, heated to 65-75 ℃ by a lean/rich amine liquid heat exchanger, further about 70 ℃, and enters the upper part of an amine liquid primary flash tower to flash off part of CO2Gas, part of CO flashed off2Heating the rich amine liquid of the gas to 95-105 ℃ through a heat exchange tube bundle or a plate bundle at the lower part of the primary amine liquid flash tower, further heating the rich amine liquid to about 99 ℃, outputting the rich amine liquid from the bottom of the primary amine liquid flash tower, throttling and reducing the pressure to 0.01-0.06MPa (G), preferably 0.02-0.05MPa (G) through a fourth regulating valve, entering the rich amine liquid from the upper part of the secondary amine liquid flash tower, further desorbing CO2Gas, and after full desorption, the lean amine liquid (about 20-40 wt% of MDEA aqueous solution) is output from the bottom of the amine liquid secondary flash tower, and is sequentially cooled to 40-50 ℃ by a lean/rich amine liquid heat exchanger and an amine liquid cooler and then is conveyed to a solution buffer tank;
(4) the lean amine liquid pumped out from the bottom of the solution buffer tank is pressurized by an amine liquid circulating pump and then divided into two paths, wherein the first path is directly pumped to the upper part of the absorption tower after most of the amine liquid (for example, 60-80% of the total lean amine liquid) is pressurized, and the other path is filtered and then returns to an inlet pipeline of the amine liquid circulating pump;
(5) part of CO is flashed from the top of the primary amine liquid flash tower2The gas is decompressed to 0.01-0.06MPa (G), preferably 0.02-0.05MPa (G) through a fifth regulating valve, and then is conveyed to an amine liquid secondary flash tower, a heat exchange tube bundle or a plate bundle (circulating water flowing in the tube bundle or the plate bundle) is arranged in the upper part of the amine liquid secondary flash tower, and finally resolved CO is removed2Cooling the gas to 35-45 deg.C, liquid-sealing, and discharging at high point.
Further, considering that improper operation, substandard amine liquid filtration or raw material gas component change may cause amine liquid foaming, in order to prevent amine liquid foaming and supplement amine liquid loss in the operation process, a feeding tank and a feeding pump are needed to supplement a defoaming agent or an absorbent into a solution buffer tank.
The invention has the advantages that:
1. absorbing and removing CO in the raw material gas by adopting semi-barren solution2Compared with the traditional deacidification process, the method is provided with the primary amine liquid flash tower and the amine liquidA second-stage flash tower without a regeneration tower, an amine-rich liquid flash tank and CO2The gas-liquid separator and the reflux pump of the regeneration tower greatly simplify the process;
2. only the heat exchange tube bundle or the plate bundle is arranged in the lower part of the amine liquid primary flash tower, the heat exchange tube bundle or the plate bundle is arranged in the upper part of the amine liquid secondary flash tower, and a heat exchanger shell is not required to be additionally arranged, so that the equipment investment is reduced, and the heat extraction amount of the amine liquid is greatly reduced compared with that of the traditional process, so that the energy consumption of the device is effectively reduced;
3. the adoption of the semi-barren solution is beneficial to the control of the temperature of the absorption tower and prevents the temperature runaway in the absorption tower.
4. Is suitable for the working condition of high acid gas load, the highest carbon content in the raw material gas can reach 35 percent (mole percent), and the purified gas CO is2Content (wt.)<2.5％(mole％)。
Drawings
FIG. 1 is a schematic view showing the structure of an apparatus for decarburization and regenerating an amine liquid according to the present invention.
Wherein, T-1, an absorption tower T-2, an amine liquid primary flash tower T-3, an amine liquid secondary flash tower E-1, a purified gas cooler E-2, a lean/rich amine liquid heat exchanger E-3, a lean amine liquid cooler F-1, an amine liquid filter P-1A/B, an absorption tower cleaning pump P-2A/B, a charging pump P-3A/B, an amine liquid circulating pump V-1, a purified gas-liquid separator V-2, a charging tank V-3, a solution buffer tank V-4 and a liquid seal tank
X-2, a first regulating valve X-3, a second regulating valve X-4, a third regulating valve X-7, a fourth regulating valve X-6, a fifth regulating valve X-10, a sixth regulating valve X-1, a seventh regulating valve X-9, an eighth regulating valve X-5, a ninth regulating valve X-8 and a tenth regulating valve.
Detailed Description
The invention is further illustrated by the following figures and examples.
As shown in FIG. 1, a catalyst containing CO at a high concentration2The device comprises an absorption tower T-1 for purifying high acid raw gas, an amine liquid primary flash tower T-2 for primarily desorbing an amine-rich liquid (the amine liquid for absorbing acid gas), an amine liquid secondary flash tower T-3 for secondarily desorbing the amine-rich liquid, and a purified gas cooler E-1 for cooling purified gasThe system comprises a lean/rich amine liquid heat exchanger E-2 used for heating rich amine liquid and primarily cooling lean amine liquid (amine liquid after desorption), a lean amine liquid cooler E-3 used for secondarily cooling the lean amine liquid, an amine liquid filter F-1 used for purifying the lean amine liquid entering an absorption tower, an absorption tower cleaning pump P-1A/B used for pumping liquid output by a purified gas-liquid separator into the absorption tower, an amine liquid circulating pump P-3A/B used for pumping the lean amine liquid in a solution buffer tank into the absorption tower, a purified gas-liquid separator V-1 used for separating free water carried by purified gas, a solution buffer tank V-3 used for temporarily storing the lean amine liquid, a liquid seal tank V-4 used for emptying acid gas and adjusting valves X-1-10.
A gas-phase inlet of an absorption tower T-1 is connected with a high-acid feed gas input pipeline, a gas-phase outlet at the top of the absorption tower T-1 is connected with a hot channel inlet of a purified gas cooler E-1 through a pipeline, a hot channel outlet of the purified gas cooler E-1 is connected with an inlet of a purified gas-liquid separator V-1 through a pipeline, a tank top gas-phase outlet of the purified gas-liquid separator V-1 is connected to a purified gas output pipeline provided with a first regulating valve X-2, a tank bottom liquid-phase outlet of the purified gas-liquid separator V-1 is connected to an inlet of an absorption tower cleaning pump P-1A/B through a pipeline, an output pipeline of the absorption tower cleaning pump P-1A/B is divided into two branch pipes, one branch pipe returns to the purified gas-liquid separator V-1, and the other branch pipe is connected to the upper part of the absorption tower T;
a liquid phase outlet at the bottom of the absorption tower T-1 is connected to a cold flow channel inlet of a lean/rich amine liquid heat exchanger E-2 through a third regulating valve X-4, a cold flow channel outlet of the lean/rich amine liquid heat exchanger E-2 is connected to a feed inlet at the upper part of an amine liquid primary flash tower T-2 through a pipeline, a liquid phase output pipeline at the bottom of the amine liquid primary flash tower T-2 is connected to a liquid phase inlet of an amine liquid secondary flash tower T-3 through a fourth regulating valve X-7, a gas phase outlet at the top of the amine liquid primary flash tower T-2 is connected to a gas phase inlet of the amine liquid secondary flash tower T-3 through a fifth regulating valve X-6, and a gas phase outlet at the top of the amine liquid secondary flash tower T-3 is connected to a liquid seal tank V-4 through a pipeline and then is;
a liquid phase outlet at the bottom of the amine liquid secondary flash tower T-3 is connected to a hot flow channel inlet of a lean/rich amine liquid heat exchanger E-2 through a pipeline, a hot flow channel outlet of the lean/rich amine liquid heat exchanger E-2 is connected to a hot flow channel inlet of a lean amine liquid cooler E-3, a hot flow channel outlet of the lean amine liquid cooler is connected to a solution buffer tank V-3 through a pipeline, an amine liquid output pipeline of the solution buffer tank V-3 is divided into two branch pipes after passing through an amine liquid circulating pump P-3A/B, one branch pipe is connected to a liquid phase inlet of the absorption tower T-1, and the other branch pipe is connected to an inlet pipeline from the solution buffer tank V-3 to an amine liquid circulating pump P-3A/B after passing through a sixth regulating valve X-10 and an amine liquid filter F-1 in sequence.
The purified gas cooler E-1 and the lean amine liquid cooler E-3 are respectively provided with a seventh regulating valve X-1 and an eighth regulating valve X-9 at the cold flow output pipeline sides; a heat exchange tube bundle or plate bundle for heating the amine-rich liquid and taking heat conduction oil or steam as a heat medium is arranged in the lower part of the amine liquid primary flash tower T-2, and a ninth regulating valve X-5 is arranged on the side of a heat flow input pipeline; and a heat exchange tube bundle or a plate bundle (used for cooling acid gas and preferably using circulating water as a refrigerant) is arranged in the upper part of the amine liquid secondary flash tower, and a tenth regulating valve X-8 is arranged on the side of a circulating water output pipeline.
The gas phase inlet of the absorption tower T-1 is positioned at the bottom of the absorption tower, and the liquid phase inlet of the absorption tower is positioned at the upper part of the absorption tower.
The device can further comprise a feeding tank V-2 for storing the defoaming agent or the absorbent and a feeding pump P-2A/B for providing power for the defoaming agent or the absorbent and pumping the defoaming agent or the absorbent into the solution buffer tank, wherein a liquid phase output pipeline at the bottom of the feeding tank V-2 is connected with the solution buffer tank V-3 after passing through the feeding pump P-2A/B, and the feeding pump is preferably a pneumatic diaphragm pump.
Preferably, the first regulating valve X-2 is feedback regulated by a pressure-indicating controller PIC arranged on the purge gas output line.
Preferably, the second regulating valve X-3 is regulated by a level indicator control LIC provided in the purified gas-liquid separator V-1. If the internal liquid level is high, the opening degree of the valve is correspondingly increased.
Preferably, the third regulating valve X-4 is regulated by a level controller LIC provided in the absorption column T-1.
Preferably, the fourth regulating valve X-7 is regulated by a level indicator control LIC arranged inside the amine liquid primary flash column T-2.
Preferably, the fifth regulating valve X-6 is regulated by a pressure indication controller PIC arranged on the gas phase outlet line at the top of the amine liquid primary flash column T-2.
Preferably, the sixth regulating valve X-10 is regulated by a flow indicator controller FIC provided on the other branch of the amine liquid outlet line of the solution buffer tank V-3.
Preferably, the seventh regulator valve X-1 is regulated by a temperature indication controller TIC provided on the conduit between the purge gas cooler E-1 to the purge gas-liquid separator V-1.
Preferably, the eighth regulating valve X-9 is regulated by a temperature indicating controller TIC provided on a pipe between the lean amine liquid cooler E-3 to the liquid buffer tank V-3.
Preferably, the ninth regulation valve X-5 is regulated by a temperature-indicating controller TIC arranged on the liquid phase output line at the bottom of the amine liquid primary flash column T-2.
Preferably, the tenth regulating valve X-8 is regulated by a temperature indicator control TIC provided on the top gas phase outlet line of the amine liquid secondary flash column T-3.
Example 1
(1)CO2Absorption: natural gas (high acid raw material gas mainly contains CH) with carbon content of 25% (mole%) and temperature of about 40 deg.C4、CO2In addition, contains a small amount of H2Or N2) Enters from the bottom of the absorption tower T-1 and flows from bottom to top; amine liquid (about 35 wt% MDEA aqueous solution) at about 46 ℃ is sprayed from the upper part of the absorption tower T-1 (the volume flow ratio of the high-acid raw material gas to the amine liquid is about 30:1), the amine liquid and the natural gas which flow in the reverse direction pass through the absorption tower T-1 from top to bottom, and after the amine liquid and the natural gas fully contact and transfer heat and mass in the tower, CO in the natural gas2Absorbed by amine liquid, and CO is output from the top of the absorption tower2The concentration is reduced to below 2.5% (mole%).
(2) The purified gas discharged from the top of the absorption tower T-1 is cooled (usually to about 38 ℃) by a purified gas cooler E-1, and then enters a purified gas-liquid separator V-1 to separate the entrained airPurified gas (CO) discharged from the top of the purified gas-liquid separator V-1 while leaving water2Natural gas or synthesis gas with the content of less than 2.5 percent mole) is taken as a product and sent out of the device, and liquid phase obtained by separating from the bottom of the gas-liquid separator V-1 of the purified gas is pressurized by a cleaning pump P-1A/B of the absorption tower and then returns to the top of the absorption tower T-1.
(3) Amine liquid regeneration: the rich amine liquid absorbing the acid gas is output from the bottom of the absorption tower T-1, throttled and depressurized to about 0.4MPa (G) by a third regulating valve X-4, heated to about 99 ℃ by a lean/rich amine liquid heat exchanger E-2, and then enters an amine liquid primary flash tower T-2 to flash off part of CO2The lower part of the first-stage flash tower T-2 for gas and amine liquid is internally provided with a heat exchange tube bundle, and the amine liquid is heated to about 99 ℃ by adopting heat conduction oil. The liquid ammonia is discharged from the bottom of a first-stage flash tower T-2 of the liquid ammonia, throttled and decompressed to about 0.03MPa (G) by a fourth regulating valve X-7, enters from the upper part of a second-stage flash tower T-3 of the liquid ammonia, and further desorbs and sucks CO2And (3) outputting the lean amine liquid obtained after the gas and the sufficient desorption from the bottom of an amine liquid secondary flash tower T-3, sequentially cooling the lean amine liquid and the rich amine liquid to about 45 ℃ through a lean/rich amine liquid heat exchanger E-2 and a lean amine liquid cooler E-3, and then sending the cooled lean amine liquid to a solution buffer tank V-3. The defoaming agent or the absorbent (amine liquid) is supplemented into the solution buffer tank V-3 through the feeding tank V-2 and the feeding pump P-2A/B, in order to prevent the amine liquid from foaming, the defoaming agent is added at one time in the initial stage of operation, and the mass concentration of the defoaming agent is less than one ten thousandth.
(4) The amine liquid extracted from the bottom of the solution buffer tank V-3 is pressurized by an amine liquid circulating pump P-3A/B and then divided into two paths, wherein the first path is directly pumped to the upper part of an absorption tower T-1 after 60 percent of all lean amine liquid is pressurized, and the other path is filtered and then returns to an inlet pipeline of the amine liquid circulating pump P-3A/B.
(5) Part of CO is flashed from the top of the amine liquid primary flash tower T-22The gas is decompressed to about 0.03MPa (G) by a fifth regulating valve X-6 and then is sent to an amine liquid secondary flash tower T-3, a heat exchange tube bundle or a plate bundle is arranged in the upper part of the amine liquid secondary flash tower T-3, circulating water flows in the tube bundle or the plate bundle, and finally resolved CO is obtained2Cooling the gas to about 40 ℃, and emptying at a high point after liquid sealing.
Compared with the traditional method for removing high-concentration CO from gas2The process for regenerating the amine liquid uses the primary flash tower and the secondary flash tower of amine liquid to replace the regenerating tower onlyThe lower part of the first-stage flash tower provides part of heat through a heating medium, so that the heat taking amount is greatly reduced, and the energy consumption of the device is reduced; the primary flash tower replaces an amine-rich liquid flash tank in the traditional process, and the existence of the secondary flash tower enables the process to be free from arranging a carbon dioxide gas-liquid separator and a regeneration tower reflux pump, so that the number of equipment is greatly reduced, and the process is greatly simplified.
Example 2
(1)CO2Absorption: carbon content or CO2Synthetic gas (the component of high-acid feed gas is mainly CH) with 35 percent (mole%) of content and 40 ℃ of temperature4、CO2In addition, contains a small amount of H2Or N2) Enters from the bottom of the absorption tower T-1 and flows from bottom to top; amine-poor liquid (MDEA water solution with the concentration of about 35wt percent and the spraying density of the amine liquid of 15 to 20 m) at the temperature of about 46 DEG C3/m2H) is sprayed from the upper part of the absorption tower T-1 (the volume flow ratio of the high-acid feed gas to the amine liquid is about 27:1), the high-acid feed gas and the amine liquid pass through the absorption tower T-1 from top to bottom, the amine liquid and the natural gas which flow in the reverse direction are fully contacted in the tower to transfer heat and mass, and then CO in the natural gas2Absorbed by amine liquid, and CO is output from the top of the absorption tower2The concentration is reduced to below 2.5% (mole%).
(2) The purified gas discharged from the top of the absorption tower T-1 is cooled to about 38 ℃ by a purified gas cooler E-1, and then enters a purified gas-liquid separator V-1 to separate the carried free water and the purified gas discharged from the top of the purified gas-liquid separator V-1 (natural gas or synthetic gas after CO2 is removed, CO) is discharged2The residual quantity is not more than 2.5 percent (mole percent) is taken as a product to be sent out of the device, and the liquid phase obtained by separating from the bottom of the purified gas-gas liquid separator V-1 is pressurized by an absorption tower cleaning pump P-1A/B and then returns to the top of the absorption tower T-1.
(3) Amine liquid regeneration: the rich amine liquid absorbing the acid gas is output from the bottom of the absorption tower T-1, throttled and depressurized to about 0.35MPa (G) by a third regulating valve, heated to about 69 ℃ by a lean/rich amine liquid heat exchanger E-2, and enters the upper part of the amine liquid primary flash tower and flashes part of CO out2The lower part of the first-stage flash tower T-2 for gas and amine liquid is internally provided with a heat exchange tube bundle, and the amine liquid is heated to about 99 ℃ by adopting heat conduction oil. Bottom of amine liquid primary flash tower T-2Outputting, throttling and reducing pressure to about 0.035MPa (G) through a fourth regulating valve X-7, then entering from the upper part of an amine liquid secondary flash tower T-3, further desorbing CO2And (3) outputting the lean amine liquid obtained after the gas and the sufficient desorption from the bottom of an amine liquid secondary flash tower T-3, sequentially cooling the lean amine liquid and the rich amine liquid to about 45 ℃ through a lean/rich amine liquid heat exchanger E-2 and a lean amine liquid cooler E-3, and then sending the cooled lean amine liquid to a solution buffer tank V-3. The defoaming agent or the absorbent is supplemented into the solution buffer tank V-3 through a feeding tank V-2 and a feeding pump P-2A/B.
(4) The lean amine liquid extracted from the bottom of the solution buffer tank V-3 is pressurized by an amine liquid circulating pump P-3A/B and then divided into two paths, wherein the first path is directly pumped to the upper part of an absorption tower T-1 after 80% of the lean amine liquid is pressurized, and the other path is filtered and then returns to an inlet pipeline of the amine liquid circulating pump P-3A/B.
(5) Part of CO is flashed from the top of the amine liquid primary flash tower T-22The gas is decompressed to about 0.035MPa (G) by a fifth regulating valve X-6 and then is sent to an amine liquid secondary flash tower T-3, a heat exchange tube bundle or a plate bundle is arranged in the upper part of the amine liquid secondary flash tower T-3, circulating water is fed in the tube bundle or the plate bundle, and finally resolved CO is obtained2Cooling the gas to about 40 ℃, and emptying at a high point after liquid sealing.
While specific embodiments of the invention have been described in detail above, it should be understood that the above description is illustrative, and not restrictive, of the scope of the invention. The scope of the invention should be determined from the following claims.
Claims (10)
1. Containing high concentration CO2The device comprises an absorption tower for purifying high-acid raw gas, an amine liquid primary flash tower for primarily desorbing rich amine liquid, an amine liquid secondary flash tower for secondarily desorbing the rich amine liquid, a purified gas cooler for cooling purified gas, a lean/rich amine liquid heat exchanger for heating the rich amine liquid and primarily cooling lean amine liquid, a lean amine liquid cooler for secondarily cooling the lean amine liquid, a solution buffer tank for temporarily storing the lean amine liquid, an amine liquid circulating pump for pumping the amine liquid in the solution buffer tank into the absorption tower, an amine liquid filter for purifying the lean amine liquid entering the absorption tower, and a purified gas filter for separating purified gasThe device comprises a gas-liquid separator for purifying the carried free water, an absorption tower cleaning pump for pumping the liquid output by the gas-liquid separator into an absorption tower, a liquid seal tank for emptying the acid gas and an adjusting valve;
the gas-phase inlet of the absorption tower is connected with a high-acid feed gas input pipeline, a purified gas outlet at the top of the absorption tower is connected with a hot channel inlet of a purified gas cooler through a pipeline, a hot channel outlet of the purified gas cooler is connected with an inlet of a purified gas-liquid separator through a pipeline, a tank top gas-phase outlet of the purified gas-liquid separator is connected to a purified gas output pipeline provided with a first regulating valve, a tank bottom liquid-phase outlet of the purified gas-liquid separator is connected to an inlet of an absorption tower cleaning pump through a pipeline, an output pipeline of the absorption tower cleaning pump is divided into two branch pipes, one branch pipe returns to the purified gas-liquid separator, and the other branch pipe is connected to the upper part;
a liquid phase outlet at the bottom of the absorption tower is connected to a cold flow channel inlet of the lean/rich amine liquid heat exchanger through a third regulating valve, a cold flow channel outlet of the lean/rich amine liquid heat exchanger is connected to a feed inlet at the upper part of the primary amine liquid flash tower through a pipeline, a liquid phase output pipeline at the bottom of the primary amine liquid flash tower is connected to a liquid phase inlet of the secondary amine liquid flash tower through a fourth regulating valve, a gas phase outlet at the top of the primary amine liquid flash tower is connected to a gas phase inlet of the secondary amine liquid flash tower through a fifth regulating valve, and a gas phase outlet at the top of the secondary amine liquid flash tower is connected to a liquid seal tank through a pipeline;
a liquid phase outlet at the bottom of the amine liquid secondary flash tower is connected to a hot flow channel inlet of the lean/rich amine liquid heat exchanger through a pipeline, a hot flow channel outlet of the lean/rich amine liquid heat exchanger is connected to a hot flow channel inlet of the lean amine liquid cooler, a hot flow channel outlet of the lean amine liquid cooler is connected to a solution buffer tank through a pipeline, an amine liquid output pipeline of the solution buffer tank is divided into a plurality of branch pipes after passing through an amine liquid circulating pump, one branch pipe is connected to a liquid phase inlet of the absorption tower, and the other branch pipe is connected to an inlet pipeline from the solution buffer tank to the amine liquid circulating pump after passing through a sixth regulating valve and an amine liquid filter in.
2. The decarbonization and amine liquid regeneration device according to claim 1, wherein the gas phase inlet of the absorption tower is located at the bottom of the absorption tower, and the liquid phase inlet of the absorption tower is located at the upper portion of the absorption tower.
3. The decarburization and amine liquids regeneration facility as claimed in claim 1 or 2, further comprising a feed tank for storing an antifoaming agent or absorbent, a feed pump for powering and pumping the antifoaming agent or absorbent into the solution buffer tank; the liquid phase output pipeline at the bottom of the feeding tank is connected with the solution buffer tank after passing through the feeding pump, and the feeding pump is preferably a pneumatic diaphragm pump.
4. The decarbonization and amine liquid regeneration device according to any one of claims 1 to 3, wherein the purified gas cooler, the lean/rich amine liquid heat exchanger, and the lean amine liquid cooler are plate-type or shell-and-tube type heat exchangers using a circulating water cooling system or an air cooling system.
5. The decarbonization and amine liquid regeneration device according to any one of claims 1 to 4, wherein a heat exchange tube bundle or a plate bundle for heating the amine-rich liquid and using heat oil or steam as a heat medium is arranged in the lower part of the amine liquid primary flash tower, and a heat exchange tube bundle or a plate bundle for cooling the acid gas and using a circulating water as a refrigerant is arranged in the upper part of the amine liquid secondary flash tower.
6. The decarburization and amine liquid regenerating apparatus as set forth in any one of claims 1 to 5, wherein the purge gas cooler and the lean amine liquid cooler are provided with a seventh regulating valve and an eighth regulating valve, respectively, on the respective cold flow output line sides; a heat exchange tube bundle or a plate bundle for heating the amine-rich liquid and taking heat conduction oil or steam as a heat medium is arranged in the lower part of the amine liquid primary flash tower, and a ninth regulating valve is arranged on the side of a heat flow input pipeline; and a heat exchange tube bundle or a plate bundle is arranged in the upper part of the amine liquid secondary flash tower, and a tenth regulating valve is arranged on the side of a circulating water output pipeline.
7. A method for decarbonization and amine liquid regeneration using the apparatus of any one of claims 1 to 6, the method comprising:
(1) the high acid raw material gas enters from the bottom of the absorption tower; the lean amine liquid is sprayed from the upper part of the absorption tower, and after the lean amine liquid and the high-acid feed gas transfer heat and mass in the tower, CO is output from the top of the absorption tower2A purified gas having a concentration of less than 2.5 mole%;
(2) the purified gas is cooled by a purified gas cooler and then is conveyed to a purified gas-liquid separator for gas-liquid separation, the gas output from the top of the purified gas-liquid separator is used as a product output device, and the liquid phase obtained by bottom separation returns to the top of the absorption tower;
(3) the rich amine liquid output from the bottom of the absorption tower enters an amine liquid primary flash tower after throttling and pressure reduction and temperature rise of a lean/rich amine liquid heat exchanger, and part of CO is flashed out2The rich amine liquid of the gas is heated by a heat exchange tube bundle or a plate bundle at the lower part of the primary amine liquid flash tower, is output from the bottom of the primary amine liquid flash tower, is throttled and decompressed, then enters from the upper part of the secondary amine liquid flash tower, and further desorbs and sucks CO2Gas, outputting lean amine liquid from the bottom of the amine liquid secondary flash tower, cooling the lean amine liquid to 40-50 ℃, and then conveying the lean amine liquid to a solution buffer tank;
(4) the lean amine liquid pumped out from the bottom of the solution buffer tank is pressurized by an amine liquid circulating pump and then divided into two paths, wherein the first path is directly pumped to the upper part of the absorption tower after most of the amine liquid (for example, 60-80% of the total lean amine liquid) is pressurized, and the other path is filtered and then returns to an inlet pipeline of the amine liquid circulating pump;
(5) part of CO is flashed from the top of the primary amine liquid flash tower2The gas is decompressed to 0.01-0.06MPaG, preferably 0.02-0.05MPaG, then is conveyed to an amine liquid secondary flash tower to be cooled to 35-45 ℃, and is discharged at a high point after liquid tank sealing.
8. The method according to claim 7, wherein the rich amine liquid is throttled down by a third regulating valve to 0.2-0.6MPaG, preferably 0.3-0.5 MPaG; the amine-rich liquid is throttled and decompressed to 0.01-0.06MPaG, preferably 0.02-0.05MPaG by a fourth regulating valve.
9. The method according to claim 7 or 8, wherein the solution buffer tank is supplemented with the antifoaming agent or the absorbent through a feed tank, a feed pump.
10. The method according to any one of claims 7-9, wherein the volumetric flow ratio of the high acid feed gas to the amine liquid is between 24:1 and 37: 1.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113134281A (en) * | 2021-05-10 | 2021-07-20 | 重庆丰淼生态环境科技有限责任公司 | Method for capturing carbon dioxide in flue gas of power plant |
| CN113355138A (en) * | 2021-04-28 | 2021-09-07 | 广东韶钢松山股份有限公司 | Desulfurization analysis system and use method |
| CN117603744A (en) * | 2024-01-24 | 2024-02-27 | 山西国化能源有限责任公司 | Automatic natural gas desulfurization system |
| CN118064198A (en) * | 2024-04-23 | 2024-05-24 | 新疆凯龙清洁能源股份有限公司 | Intelligent control method and system for removing carbon dioxide in natural gas |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113355138A (en) * | 2021-04-28 | 2021-09-07 | 广东韶钢松山股份有限公司 | Desulfurization analysis system and use method |
| CN113355138B (en) * | 2021-04-28 | 2022-10-14 | 广东韶钢松山股份有限公司 | Desulfurization analysis system and use method |
| CN113134281A (en) * | 2021-05-10 | 2021-07-20 | 重庆丰淼生态环境科技有限责任公司 | Method for capturing carbon dioxide in flue gas of power plant |
| CN117603744A (en) * | 2024-01-24 | 2024-02-27 | 山西国化能源有限责任公司 | Automatic natural gas desulfurization system |
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