CN115806369A - Process method for desalting and dechlorinating lean amine liquid - Google Patents
Process method for desalting and dechlorinating lean amine liquid Download PDFInfo
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Abstract
The invention discloses a process method for desalting and dechlorinating lean amine liquid, which relates to the technical field of desalting and dechlorinating of lean amine liquid and comprises the following two treatment modes: the invention relates to a high-efficiency desalting method and a precise desalting method, aiming at the problems in the existing amine liquid, combining the technical requirements of energy efficiency improvement of an amine liquid system, and realizing high-efficiency desalting and deep dechlorination in the amine liquid by integrating multiple technologies; by the process method for desalting and dechlorinating the lean amine liquid, the heat stable salt content in an amine liquid system is controlled to be below 1%, the chloride ion content is controlled to be below 50mg/L, the overall cleanliness of the amine liquid system is improved, and the operation efficiency of the amine liquid system is further guaranteed.
Description
Technical Field
The invention relates to the technical field of desalting and dechlorinating of lean amine liquid, in particular to a process method for desalting and dechlorinating lean amine liquid.
Background
The amine solution is a kind of organic alkali solution, generally refers to a weakly alkaline organic amine solvent used for absorbing hydrogen sulfide or carbon dioxide in the chemical process of desulfurization and decarburization, and the ethanolamine is more, and commonly comprises Monoethanolamine (MEA), diethanolamine (DEA), diisopropanolamine (DIPA), N-Methyldiethanolamine (MDEA) and the like, or a mixed solution thereof.
The amine liquid is commonly used in chemical processes of petroleum, natural gas, coal chemical industry, synthetic ammonia and the like, and hydrogen sulfide, carbon dioxide and other impurities in raw material gas are absorbed and removed. Then the organic solvent is heated and distilled, and the organic solvent is returned to the adsorption tower for recycling. Wherein the lean amine liquid is called after hydrogen sulfide or carbon dioxide is released through heating and distillation, and the temperature of the lean amine liquid can be reduced to below 50 ℃ after heat exchange.
The amine liquid system is the third material flow of the refining enterprise next to the crude oil and circulating water system, and the operation effect of the amine liquid system is directly related to the product reaching the standard and the whole process stable operation.
In the amine desulfurization process, various anions are accumulated in a system and generate heat stable salt due to the degradation of solvent amine, impurities in raw material gas, material entrainment and the like. Such Salts cannot be regenerated and decomposed by heating (120 ℃), and are stably present in an organic solvent system, and are collectively called Heat Stable Salts (HSS for short). Common are chloride salts, hydrochloride salts, sulfate salts, formate salts, acetate salts, oxalate salts, thiocyanate salts, thiosulfate salts and the like.
According to research and domestic equipment operation experience in recent years, the total level of the heat stable salt should not exceed 1%, and the content of chloride ions should be controlled at 50mg/L. The accumulation of heat stable salts, particularly chloride ions, can cause a number of problems, such as: equipment corrosion, organic solvent loss, filter element fouling and blockage, and organic solvent foaming affect the subsequent hydrocracking process, thereby causing product quality reduction.
Summarized by engineering projects, the domestic amine liquid system has the following common problems:
1. high salt content, and constant accumulation, including metal cations, anions (including heat stable salts);
2. the content of chloride ions is accumulated continuously, and is difficult to remove, equipment is corroded continuously, and the subsequent process is influenced;
3. the oil is brought into the system and is accumulated continuously;
4. the organic matter is accumulated continuously, and the amine liquid changes color and foams;
5. solid suspended matters are continuously accumulated, equipment is corroded, and dirt and blockage are generated.
Disclosure of Invention
The invention aims to solve the problems in the prior art and provides a process method for desalting and dechlorinating lean amine liquid.
In order to achieve the purpose, the invention adopts the following technical scheme:
a process method for desalting and dechlorinating lean amine liquid comprises the following two treatment modes:
(I) high-efficiency desalting method
The high-efficiency desalting mode at least comprises the following equipment: the system comprises a precision filter, a waste water tank, a left waste water pump, a right waste water pump, a filter A, an amine liquid tank, an amine liquid pump, a filter B, a booster pump, an electrode water tank, an electrode water pump, a filter C, electrodialysis equipment, an alkali tank, an acid tank, a regeneration pump and a desalting high-speed bed;
conveying the lean amine liquid to a lean amine liquid inlet N3, then feeding the lean amine liquid into a precision filter, filtering the lean amine liquid, then feeding the lean amine liquid into an amine liquid tank, waiting for starting after reaching a liquid level arranged inside the amine liquid tank, conveying the demineralized water to a demineralized water inlet N1, then feeding the demineralized water into a wastewater tank, waiting for starting after reaching the liquid level of the wastewater tank, and configuring a saline solution with the concentration of 1% in an electrode water tank;
starting an amine liquid pump, a right wastewater pump and an electrode water pump, starting an electrodialysis device, and enabling lean amine liquid, desalted water and electrode water to respectively enter a filter A, a filter B and a filter C on each channel and then enter the electrodialysis device for cyclic desalination, and rapidly desalinating under the action of an electric field of the electrodialysis device;
when the salt content of the wastewater tank is more than 15%, performing an effluent wastewater discharge process through a left wastewater pump, discharging the wastewater through an electrodialysis wastewater discharge outlet N2, and replenishing the desalted water of a fresh line through a desalted water inlet N1;
when the salt content in the amine liquid tank is close to 1%, pumping the lean amine liquid into a desalting high-speed bed through a booster pump, and deeply desalting the lean amine liquid through the desalting high-speed bed;
the content of the amine liquid salt after the treatment of the desalting high-speed bed is less than 1 percent, and the amine liquid salt is discharged back to the original amine liquid system through a water producing port N7;
after the desalting high-speed bed runs for a period of time, the desalting high-speed bed needs to be regenerated and washed, pressurized desalting water enters through a desalting water port N9 to wash the desalting high-speed bed, and nitrogen enters through a nitrogen port N8 to discharge waste liquid and scrub the desalting high-speed bed;
acid enters the acid tank and the alkali tank through the acid supply port N5, alkali enters the acid tank and the alkali tank through the alkali supply port N6, acid liquor and alkali liquor in the acid tank and the alkali tank are respectively introduced into the desalting high-speed bed through the regeneration pump, and the desalting high-speed bed is used for regeneration;
and wastewater generated by the desalting high-speed bed is discharged through a wastewater port N10.
Precise chlorine salt removing mode
The precise chlorine salt removing mode at least comprises the following equipment: the device comprises a precision filter, a wastewater tank, a left wastewater pump, a right wastewater pump, a filter A, an amine liquid tank, a high-pressure pump, an amine liquid pump, a filter B, a booster pump, an electrode water tank, an electrode water pump, a filter C, an electrodialysis device, a roll-type ion screening membrane, an alkali tank, an acid tank, a regeneration pump and a desalting high-speed bed;
conveying the lean amine liquid to a lean amine liquid inlet N3, then feeding the lean amine liquid into a precision filter, filtering the lean amine liquid, then feeding the lean amine liquid into an amine liquid tank, waiting for starting after reaching a liquid level arranged inside the amine liquid tank, conveying the demineralized water to a demineralized water inlet N1, then feeding the demineralized water into a wastewater tank, waiting for starting after reaching the liquid level of the wastewater tank, and configuring a saline solution with the concentration of 1% in an electrode water tank;
starting an amine liquid pump, a right wastewater pump and an electrode water pump, starting the electrodialysis equipment, starting the amine liquid pump, the right wastewater pump and the electrode water pump, starting the electrodialysis equipment, and enabling the lean amine liquid, the desalted water and the electrode water to respectively enter a filter A, a filter B and a filter C on each channel and then enter the electrodialysis equipment for circular desalination, and rapidly desalinating under the action of an electric field of the electrodialysis equipment;
when the salt content of the wastewater tank is more than 15%, performing a wastewater discharge process through a left wastewater pump, discharging the wastewater through an electrodialysis wastewater discharge port N2, and replenishing the desalted water through a desalted water inlet N1 again;
after the salt content in the amine liquid tank 6 is close to 1%, pumping the lean amine liquid into a roll-type ion screening membrane through a high-pressure pump, and screening chloride ions through the roll-type ion screening membrane, so as to enrich the concentration lean amine liquid containing high-concentration chloride ions;
leading the lean amine liquid which is produced by the roll type ion screening membrane and is rich in chloride ions into a desalting high-speed bed, leading the chloride ion content of the amine liquid which is treated by the desalting high-speed bed to be less than 50mg/L, and discharging the amine liquid back to the original amine liquid system through a water producing port N7;
after the desalting high-speed bed and the roll type ion screening membrane operate for a period of time, regenerating and flushing are needed, pressurized desalting water is introduced through a desalting water port N9 to flush the desalting high-speed bed, and nitrogen is introduced through a nitrogen port N8 to discharge waste liquid and scrub the desalting high-speed bed;
acid enters the acid tank and the alkali tank through the acid supply port N5, alkali enters the acid tank and the alkali tank through the alkali supply port N6, acid liquor and alkali liquor in the acid tank and the alkali tank are respectively introduced into the desalting high-speed bed and the roll type ion screening membrane through the regeneration pump, and the desalting high-speed bed and the roll type ion screening membrane are used for regeneration;
and waste water generated by the spiral ion screening membrane is discharged through a waste water port N4, and waste water generated by the desalting high-speed bed is discharged through a waste water port N10.
The above technical solution further comprises:
the precision filter is internally filled with a micropore folding filter element, and the filtering precision is 0.1 mu m.
The above technical solution further comprises:
the right waste water pump, the amine liquid pump and the polar water pump are low-pressure centrifugal fluoroplastic pumps, the lift is less than 15 meters, the high-pressure pump is a variable-frequency centrifugal pump, the lift is 200 meters, and the booster pump is a centrifugal pump, and the lift is 40 meters.
The above technical solution further comprises:
the left wastewater pump and the regeneration pump are centrifugal fluoroplastic pumps.
The above technical solution further comprises:
the waste water tank, the amine liquid tank, the polar water tank, the alkali tank and the acid tank are normal-pressure storage tanks and are sealed by nitrogen.
The above technical solution further comprises:
the filter A, the filter B and the filter C are filled with filter bags, and the filtering precision is 1 mu m.
The above technical solution further comprises:
the electrodialysis equipment is a homogeneous membrane two-compartment membrane stack, the membrane stack is modularized, and each group of membrane stacks is 50 pairs.
The above technical solution further comprises:
the spiral-wound ion screening membrane is a spiral-wound membrane component, the structure of the spiral-wound ion screening membrane refers to a reverse osmosis membrane component 8040, the spiral-wound ion screening membrane is a polyamide membrane, high selectivity is achieved on chloride ions, meanwhile, the membrane component contains strong-alkaline anion resin, and the anion resin can adsorb other anions in the lean amine liquid enriched with the chloride ions first.
The above technical solution further comprises:
the desalting high-speed bed is a resin bed designed by utilizing a flat bed ion exchange desalting technology, the running flow rate of the resin bed is up to 80 m/h, and the particle size of the resin is 0.1-0.3mm.
Compared with the prior art, the invention has the beneficial effects that:
aiming at the problems in the existing amine liquid, the invention combines the technical requirements of the energy efficiency improvement of an amine liquid system, and realizes the high-efficiency desalination and deep dechlorination in the amine liquid through the integration of a plurality of technologies; the process method for desalting and dechlorinating the lean amine liquid realizes that the content of heat stable salt in an amine liquid system is controlled to be below 1 percent, the content of chloride ions is controlled to be below 50mg/L, the integral cleanliness of the amine liquid system is improved, and further the operation efficiency of the amine liquid system is ensured.
Drawings
FIG. 1 is a schematic diagram of a process for desalting and dechlorinating lean amine liquid according to the present invention.
In the figure: 1. a precision filter; 2. a waste water tank; 3. a left waste water pump; 4. a right waste water pump; 5. a filter A; 6. an amine liquid tank; 7. a high pressure pump; 8. an amine liquid pump; 9. a filter B; 10. a booster pump; 11. a polar water tank; 12. an electrode water pump; 13. a filter C; 14. an electrodialysis apparatus; 15. roll-type ion screening membrane; 16. an alkali tank; 17. an acid tank; 18. a regenerative pump; 19. a desalting high-speed bed.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", and the like, are used in the orientations and positional relationships indicated in the drawings, which are based on the orientations and positional relationships indicated in the drawings, and are used for convenience of description and simplicity of description, but do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.
As shown in fig. 1, the process method for desalting and dechlorinating lean amine liquid provided by the invention comprises the following two treatment modes:
(I) high-efficiency desalting method
The high-efficiency desalting mode at least comprises the following equipment: a precision filter 1, a wastewater tank 2, a left wastewater pump 3, a right wastewater pump 4, a filter A5, an amine liquid tank 6, an amine liquid pump 8, a filter B9, a booster pump 10, a polar water tank 11, a polar water pump 12, a filter C13, an electrodialysis device 14, an alkali tank 16, an acid tank 17, a regeneration pump 18 and a desalting high-speed bed 19;
after being conveyed to a lean amine liquid inlet N3, the lean amine liquid enters a precision filter 1, after being filtered, the lean amine liquid enters an amine liquid tank 6, the lean amine liquid is waited for starting after reaching a liquid level arranged inside the amine liquid tank 6, desalted water enters a wastewater tank 2 after being conveyed to a desalted water inlet N1, the desalted water is waited for starting after reaching a liquid level of the wastewater tank 2, and a saline solution with the concentration of 1% is prepared in an extreme water tank 11;
starting an amine liquid pump 8, a right wastewater pump 4 and an electrode water pump 12, starting an electrodialysis device 14, and enabling the lean amine liquid, the desalted water and the electrode water to respectively enter a filter A5, a filter B9 and a filter C13 on each channel and then enter the electrodialysis device 14 for circular desalination, and rapidly desalinating under the action of an electric field of the electrodialysis device 14;
when the salt content of the wastewater tank 2 is more than 15%, performing a wastewater discharge process through the left wastewater pump 3, discharging the wastewater through the electrodialysis wastewater discharge port N2, and replenishing the line demineralized water again through the demineralized water inlet N1;
when the salt content in the amine liquid tank 6 is close to 1%, pumping the lean amine liquid into a desalting high-speed bed 19 through a booster pump 10, and deeply desalting the lean amine liquid through the desalting high-speed bed 19;
the amine liquid processed by the desalting high-speed bed 19 has the salt content less than 1 percent and is discharged back to the original amine liquid system through a water producing port N7;
after the desalting high-speed bed 19 runs for a period of time, regeneration and flushing are needed, pressurized desalting water enters through a desalting water port N9 to flush the desalting high-speed bed 19, and nitrogen enters through a nitrogen port N8 to discharge waste liquid and scrub the desalting high-speed bed 19;
acid enters the acid tank 17 and the alkali tank 16 through the acid supply port N5, alkali enters the acid tank 17 and the alkali tank 16 through the alkali supply port N6, acid liquor and alkali liquor in the acid tank 17 and the alkali tank 16 are respectively introduced into the desalting high-speed bed 19 through the regeneration pump 18, and the desalting high-speed bed 19 is used for regeneration;
the wastewater generated by the desalting high-speed bed 19 is discharged through a wastewater port N10.
The heat stable salt content of the amine liquid system treated by the high-efficiency desalting mode is controlled to be less than 1 percent, the metal cations such as sodium and the like are controlled to be less than 500mg/L, and the suspended solid and oil substances are controlled to be less than 100mg/L. The high-efficiency desalting method has high salt removing capacity, and the desalting capacity per hour can reach 100kg/h.
(II) precise chlorine salt removing mode
The precise chlorine salt removing mode at least comprises the following equipment: the system comprises a precision filter 1, a wastewater tank 2, a left wastewater pump 3, a right wastewater pump 4, a filter A5, an amine liquid tank 6, a high-pressure pump 7, an amine liquid pump 8, a filter B9, a booster pump 10, an electrode water tank 11, an electrode water pump 12, a filter C13, an electrodialysis device 14, a rolled ion screening membrane 15, an alkali tank 16, an acid tank 17, a regeneration pump 18 and a desalting high-speed bed 19;
after being conveyed to a lean amine liquid inlet N3, the lean amine liquid enters a precision filter 1, after being filtered, the lean amine liquid enters an amine liquid tank 6, the lean amine liquid is waited for starting after reaching a liquid level arranged inside the amine liquid tank 6, desalted water enters a wastewater tank 2 after being conveyed to a desalted water inlet N1, the desalted water is waited for starting after reaching a liquid level of the wastewater tank 2, and a saline solution with the concentration of 1% is prepared in an extreme water tank 11;
starting an amine liquid pump 8, a right wastewater pump 4 and a polar water pump 12, starting an electrodialysis device 14, starting the amine liquid pump 8, the right wastewater pump 4 and the polar water pump 12, starting the electrodialysis device 14, and enabling lean amine liquid, desalted water and polar water to respectively enter a filter A5, a filter B9 and a filter C13 on each channel and then enter the electrodialysis device 14 for circular desalination, and rapidly desalinating under the action of an electric field of the electrodialysis device 14;
when the salt content of the wastewater tank 2 is more than 15%, performing a wastewater discharge process through the left wastewater pump 3, discharging the wastewater through the electrodialysis wastewater discharge port N2, and replenishing the line demineralized water again through the demineralized water inlet N1;
after the salt content in the amine liquid tank 6 is close to 1%, pumping the lean amine liquid into a roll-type ion screening membrane 15 through a high-pressure pump 7, and screening chloride ions through the roll-type ion screening membrane 15, so as to enrich the concentration lean amine liquid containing high-concentration chloride ions;
leading the lean amine liquid which is produced by the rolled ion screening membrane 15 and is rich in chloride ions into a desalting high-speed bed 19, leading the chloride ion content of the amine liquid which is treated by the desalting high-speed bed 19 to be less than 50mg/L, and discharging the amine liquid back to an original amine liquid system through a water producing port N7;
after the desalting high-speed bed 19 and the roll type ion screening membrane 15 are operated for a period of time, regeneration and flushing are needed, pressurized desalting water is introduced through a desalting water port N9 to flush the desalting high-speed bed 19, and nitrogen is introduced through a nitrogen port N8 to discharge waste liquid and scrub the desalting high-speed bed 19;
acid enters the acid tank 17 and the alkali tank 16 through the acid supply port N5, alkali enters the acid tank 17 and the alkali tank 16 through the alkali supply port N6, acid liquor and alkali liquor in the acid tank 17 and the alkali tank 16 are respectively introduced into the desalting high-speed bed 19 and the roll type ion screening membrane 15 through the regeneration pump 18, and the desalting high-speed bed 19 and the roll type ion screening membrane 15 are used for regeneration;
the waste water generated by the roll type ion screening membrane 15 is discharged through a waste water port N4, and the waste water generated by the desalting high-speed bed 19 is discharged through a waste water port N10.
The amine liquid system heat stable salt content after the treatment by the precise chlorine salt removing mode is controlled to be less than 1 percent, the chlorine ion content is less than 50mg/L, the metal cations such as sodium and the like are less than 500mg/L, and the suspended solid and oil substances are less than 100mg/L.
Furthermore, a micropore folding filter core is filled in the precision filter 1, and the filtering precision is 0.1 mu m.
Furthermore, the right waste water pump 4, the amine liquid pump 8 and the polar water pump 12 are low-pressure centrifugal fluoroplastic pumps, the lift is less than 15 meters, the high-pressure pump 7 is a variable-frequency centrifugal pump, the lift is 200 meters, the booster pump 10 is a centrifugal pump, and the lift is 40 meters.
Further, the left waste water pump 3 and the regeneration pump 18 are centrifugal fluoroplastic pumps.
Further, the wastewater tank 2, the amine liquid tank 6, the polar water tank 11, the alkali tank 16 and the acid tank 17 are normal pressure storage tanks, and are sealed with nitrogen gas.
Further, the filter A5, the filter B9 and the filter C13 were packed with filter bags, and the filtration accuracy was 1 μm.
Further, the electrodialysis apparatus 14 is a homogeneous membrane two-compartment membrane stack, the membrane stack is modular, and each group of membrane stacks is 50 pairs.
Further, roll up formula ion screening membrane 15 and be roll of formula membrane module, the structure refers to reverse osmosis membrane module 8040, and roll of formula ion screening membrane is the polyamide membrane, has high selectivity to chloride ion, contains strong alkaline anion resin in the membrane module simultaneously, utilizes anion resin can take the lead to adsorbing other anions in the poor amine liquid of enrichment chloride ion.
Furthermore, the desalting high-speed bed 19 is a resin bed designed by using a flat bed ion exchange desalting technology, the operation flow rate is as high as 80 m/h, and the particle size of the resin is 0.1-0.3mm.
Example 1
By adopting the desalting and dechlorinating process method for the lean amine liquid, the storage capacity of the lean amine liquid is 500 cubic meters, the initial content of heat stable salt is 3-5%, the content of chloride ions is 100-200mg/L, and the content of suspended solid is 500-600mg/L, after the treatment by the process method, the treatment lasts for 35 days, 10-15m & lt 3 & gt/day, the content of heat stable salt is less than 1%, the content of chloride ions is less than 30mg/L, the content of suspended solid is less than 100mg/L, the total wastewater yield is 115 tons, and the operation is stable within 35 days.
Example 2
By adopting the desalting and dechlorinating process method for the lean amine liquid, the storage capacity of the lean amine liquid is 100 cubic meters, the initial content of heat stable salt is 7-9 percent, the content of chloride ions is 80-100mg/L, and the suspended solid is 200mg/L, and after the treatment by the process method, the treatment lasts for 20 days, and the treatment lasts for 5-10m per day 3 The content of the thermal stable salt is less than 1 percent, the content of the chloride ion is less than 20mg/L, the content of the suspended solid is less than 100mg/L, the total water yield of the wastewater is 60 tons, and the operation is stable within 20 days.
Example 3
By adopting the desalting and dechlorinating process method for the lean amine liquid, the reserve volume of the lean amine liquid is 500 cubic meters, the initial content of heat stable salt is 1-2 percent, the content of chloride ions is 300-500mg/L, and the suspended solid is 200mg/L, and after the treatment by the process method, the treatment lasts for 60 days and is 10-15 m/day 3 The content of the thermal stable salt is less than 1 percent, the content of the chloride ion is less than 50mg/L, the content of the suspended solid is less than 100mg/L, the total water yield of the wastewater is 50 tons, and the operation is stable within 60 days.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (9)
1. A process method for desalting and dechlorinating lean amine liquid is characterized by comprising the following two treatment modes:
(I) high-efficiency desalting method
The efficient desalting method at least comprises the following equipment: the system comprises a precision filter (1), a wastewater tank (2), a left wastewater pump (3), a right wastewater pump (4), a filter A (5), an amine liquid tank (6), an amine liquid pump (8), a filter B (9), a booster pump (10), an electrode water tank (11), an electrode water pump (12), a filter C (13), electrodialysis equipment (14), an alkali tank (16), an acid tank (17), a regeneration pump (18) and a desalting high-speed bed (19);
conveying the lean amine liquid to a lean amine liquid inlet N3, then feeding the lean amine liquid into a precision filter (1), filtering the lean amine liquid, then feeding the lean amine liquid into an amine liquid tank (6), waiting for starting after reaching a liquid level arranged in the amine liquid tank (6), conveying the desalted water to a desalted water inlet N1, then feeding the desalted water into a wastewater tank (2), waiting for starting after reaching the liquid level of the wastewater tank (2), and configuring a 1% concentration salt solution in a polar water tank (11);
starting an amine liquid pump (8), a right wastewater pump (4) and an electrode water pump (12), starting an electrodialysis device (14), and enabling the lean amine liquid, the desalted water and the electrode water to respectively enter a filter A (5), a filter B (9) and a filter C (13) on each channel and then enter the electrodialysis device (14) for circular desalination, and rapidly desalinating under the action of an electric field of the electrodialysis device (14);
when the salt content of the wastewater tank (2) is more than 15%, a wastewater discharge procedure is executed through a left wastewater pump (3), wastewater is discharged through an electrodialysis wastewater discharge port N2, and line demineralized water is replenished through a demineralized water inlet N1;
when the salt content in the amine liquid tank (6) is close to 1%, pumping the lean amine liquid into a desalting high-speed bed (19) through a booster pump (10), and deeply desalting the lean amine liquid through the desalting high-speed bed (19);
the amine liquid processed by the desalting high-speed bed (19) has the salt content less than 1 percent and is discharged back to the original amine liquid system through a water producing port N7;
after the desalting high-speed bed (19) runs for a period of time, regeneration and flushing are needed, pressurized desalting water enters through a desalting water inlet N9 to flush the desalting high-speed bed (19), and nitrogen enters through a nitrogen port N8 to discharge waste liquid and scrub the desalting high-speed bed (19);
acid enters the acid tank (17) and the alkali tank (16) through the acid supply port N5, alkali enters the acid tank (17) and the alkali tank (16) through the alkali supply port N6, acid liquor and alkali liquor in the acid tank (17) and the alkali tank (16) are respectively introduced into the desalting high-speed bed (19) through the regeneration pump (18), and the desalting high-speed bed (19) is utilized for regeneration;
the wastewater generated by the desalting high-speed bed (19) is discharged through a wastewater port N10.
(II) precise chlorine salt removing mode
The precise chlorine salt removing mode at least comprises the following equipment: the device comprises a precision filter (1), a wastewater tank (2), a left wastewater pump (3), a right wastewater pump (4), a filter A (5), an amine liquid tank (6), a high-pressure pump (7), an amine liquid pump (8), a filter B (9), a booster pump (10), a polar water tank (11), a polar water pump (12), a filter C (13), an electrodialysis device (14), a roll-type ion screening membrane (15), an alkali tank (16), an acid tank (17), a regeneration pump (18) and a desalting high-speed bed (19);
after being conveyed to a lean amine liquid inlet N3, the lean amine liquid enters a precision filter (1), the lean amine liquid enters an amine liquid tank (6) after being filtered, the lean amine liquid is started after reaching a liquid level set in the amine liquid tank (6), desalted water enters a wastewater tank (2) after being conveyed to a desalted water inlet N1, the desalted water is started after reaching the liquid level of the wastewater tank (2), and a saline solution with the concentration of 1% is prepared in a polar water tank (11);
starting an amine liquid pump (8), a right wastewater pump (4) and an electrode water pump (12), starting an electrodialysis device (14), starting the amine liquid pump (8), the right wastewater pump (4), the electrode water pump (12) and the electrodialysis device (14), wherein lean amine liquid, desalted water and electrode water respectively enter a filter A (5), a filter B (9) and a filter C (13) on each channel and enter the electrodialysis device (14) for circular desalination, and rapid desalination is performed under the action of an electric field of the electrodialysis device (14);
when the salt content of the wastewater tank (2) is more than 15%, performing a wastewater discharge procedure through a left wastewater pump (3), discharging wastewater through an electrodialysis wastewater discharge port N2, and replenishing line desalted water again through a desalted water inlet N1;
after the salt content in the amine liquid tank 6 is close to 1%, pumping the lean amine liquid into a roll-type ion screening membrane (15) through a high-pressure pump (7), and screening chloride ions through the roll-type ion screening membrane (15) so as to enrich the lean amine liquid with high concentration of chloride ions;
leading the lean amine liquid which is produced by the roll type ion screening membrane (15) and is rich in chloride ions into a desalting high-speed bed (19), leading the content of chloride ions in the amine liquid which is treated by the desalting high-speed bed (19) to be less than 50mg/L, and discharging the amine liquid back to a raw amine liquid system through a water producing port N7;
after the desalting high-speed bed (19) and the roll type ion screening membrane (15) operate for a period, regeneration and flushing are needed, pressurized desalting water is introduced through a desalting water port N9 to flush the desalting high-speed bed (19), and nitrogen is introduced through a nitrogen port N8 to discharge waste liquid and scrub the desalting high-speed bed (19);
acid enters an acid tank (17) and an alkali tank (16) through an acid supply port N5, alkali enters the acid tank (17) and the alkali tank (16) through an alkali supply port N6, acid liquor and alkali liquor in the acid tank (17) and the alkali tank (16) are respectively introduced into a desalting high-speed bed (19) and a roll type ion screening membrane (15) through a regeneration pump (18), and the desalting high-speed bed (19) and the roll type ion screening membrane (15) are used for regeneration;
the waste water generated by the roll type ion screening membrane (15) is discharged through a waste water port N4, and the waste water generated by the desalting high-speed bed (19) is discharged through a waste water port N10.
2. The process method for desalting and dechlorinating the lean amine liquid according to claim 1, wherein the microfiltration filter (1) is filled with a microporous folded filter element, and the filtration precision is 0.1 μm.
3. The process method for desalting and dechlorinating the lean amine liquid according to claim 1, wherein the right wastewater pump (4), the amine liquid pump (8) and the polar water pump (12) are low-pressure centrifugal fluoroplastic pumps with a head of less than 15m, the high-pressure pump (7) is a variable-frequency centrifugal pump with a head of 200m, and the booster pump (10) is a centrifugal pump with a head of 40 m.
4. The process method for desalting and dechlorinating the lean amine liquid according to claim 1, characterized in that the left wastewater pump (3) and the regeneration pump (18) are centrifugal fluoroplastic pumps.
5. The process method for desalting and dechlorinating the lean amine liquid according to claim 1, wherein the wastewater tank (2), the amine liquid tank (6), the polar water tank (11), the alkali tank (16) and the acid tank (17) are normal-pressure storage tanks and are sealed by nitrogen.
6. The process method for desalting and dechlorinating the lean amine liquid according to claim 1, wherein filter bags are filled in the filter A (5), the filter B (9) and the filter C (13), and the filtering precision is 1 μm.
7. The amine-poor liquid desalting and dechlorinating process method according to claim 1, wherein the electrodialysis device (14) is a homogeneous membrane two-compartment membrane stack, the membrane stacks are modular, and each group of membrane stacks comprises 50 pairs of membrane stacks.
8. The amine-poor liquid desalting and dechlorinating process method according to claim 1, wherein the roll-type ion screening membrane (15) is a roll-type membrane module, the structure is referred to as reverse osmosis membrane module 8040, the roll-type ion screening membrane is a polyamide membrane, the polyamide membrane has high selectivity on chloride ions, and the membrane module contains strongly basic anion resin, and the anion resin can adsorb other anions in the amine-poor liquid enriched with chloride ions first.
9. The process for desalting and dechlorinating the lean amine liquid according to claim 1, wherein the desalting high-speed bed (19) is a resin bed designed by using a flat bed ion exchange desalting technology, the operation flow rate of the resin bed is up to 80 m/h, and the particle size of the resin bed is 0.1-0.3mm.
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