CN103212275A - Method for resolving decarburization absorbent rich liquid of synthetic ammonia shift gas - Google Patents

Method for resolving decarburization absorbent rich liquid of synthetic ammonia shift gas Download PDF

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Publication number
CN103212275A
CN103212275A CN201210016741XA CN201210016741A CN103212275A CN 103212275 A CN103212275 A CN 103212275A CN 201210016741X A CN201210016741X A CN 201210016741XA CN 201210016741 A CN201210016741 A CN 201210016741A CN 103212275 A CN103212275 A CN 103212275A
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solution
absorbent rich
rich solution
rotor
absorbent
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杨春基
陈建峰
白玉洁
杜海
关伟宏
邹海魁
初广文
曾群英
肖海成
李建忠
王桂芝
张宝军
贺德福
徐显明
王刚
张永军
冯英杰
孟锐
苑慧敏
孙建林
刘玉香
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Petrochina Co Ltd
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Petrochina Co Ltd
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Priority to CN201210016741XA priority Critical patent/CN103212275A/en
Priority to PCT/CN2012/001009 priority patent/WO2013106974A1/en
Publication of CN103212275A publication Critical patent/CN103212275A/en
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D19/00Degasification of liquids
    • B01D19/0042Degasification of liquids modifying the liquid flow
    • B01D19/0052Degasification of liquids modifying the liquid flow in rotating vessels, vessels containing movable parts or in which centrifugal movement is caused
    • CCHEMISTRY; METALLURGY
    • C01INORGANIC CHEMISTRY
    • C01BNON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B32/00Carbon; Compounds thereof
    • C01B32/50Carbon dioxide

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Organic Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Gas Separation By Absorption (AREA)

Abstract

The invention relates to a method for resolving decarbonization absorbent rich liquid of synthetic ammonia shift gas, which comprises the steps of feeding the absorbent rich liquid and steam into a hypergravity rotating bed reactor, leading the absorbent rich liquid to flow from the inner edge of a rotor to the outer edge of the rotor under the action of centrifugal force, leading the absorbent rich liquid to be in countercurrent or cross-current contact with the steam in the hypergravity rotating bed reactor, and regenerating the rich liquid under the condition of hypergravity; the resolved CO2 and the low-pressure steam after heat transfer are discharged from a gas phase outlet, and the regenerated solution flows out from a liquid phase outlet at the lower part of the supergravity reactor; the pressure of the system during analysis is 0.1-0.5 MPa, and the temperature is 90-160 ℃; the rotating speed of the rotor of the super-gravity rotating bed reactor is 100-3000 r/min; the mass percentage concentration of the absorbent rich solution of the methyl carbonate in the solution is 20-60%; the mass percentage concentration of the activating agent in the solution is 1-5%; the invention has high pregnant solution resolution ratio, low energy consumption and small equipment occupied space.

Description

A kind of method of resolving synthetic-ammonia transformation gas decarbonization absorbent rich solution
Technical field
The present invention relates to a kind of method of resolving synthetic-ammonia transformation gas decarbonization absorbent rich solution, also relate to the application of high-gravity technology in the absorbent rich solution is resolved.
Background technology
In the Ammonia Production technical process, two sections reformed gas of natural gas, CO after pyrolytic conversion 2Content is up to 18~19%, because CO 2Can make catalyst poisoning, so conversion gas must be removed thoroughly before entering synthesis loop; CO in addition 2Be again the raw material of urea plant, must be reclaimed CO 2Remove and reclaim the Carbon balance that is directly connected to the ammonia synthesis process system, therefore, CO 2Remove and reclaim most important.Decarburization energy consumption accounts for about 10% of whole ammonia energy consumption, therefore removes CO 2The energy consumption height of technology is very big to the influence of ammonia factory total energy consumption.
The method of present industrial parsing decarburization rich solution is a lot, but principle is all identical, mainly slightly different because of the difference of absorption process, all be to be mass transfer apparatus with the regenerator, low-pressure steam enters from the bottom of tower, and rich solution enters from cat head, gas-liquid is counter current contacting in packing layer, and then reach the purpose of regeneration. still, no matter adopt any method decarburization, the mass-transfer efficiency of tower equipment directly affects and absorbs CO 2After the internal circulating load and the CO of rich solution 2Reclaim, also just affect the regeneration cost of decarbonizing process.The efficient height of resolver, the internal circulating load of rich solution are with regard to corresponding minimizing, and the regeneration load reduces simultaneously, thereby has saved the energy, has reduced the cost of regenerative process.Therefore, the mass-transfer efficiency of raising analyzing device is the most direct valid approach that reduces cost, increases economic efficiency.
In the legacy equipment between the vapour-liquid power resources of reverse contact be gravitational field.Because of gravity acceleration value limited (9.8m/s2), cause the dirty speed of liquid slower, for preventing liquid flooding and serious entrainment, the vapour phase rate of climb is also little, so relative velocity is less between the two-phase, and mass transfer effect is not good.
High-gravity technology is a new technology of utilizing the hypergravity environment more much bigger than terrestrial gravitation acceleration that mass transfer, diabatic process and micro mixing are strengthened, produces the hypergravity environment of simulating by rotation on earth and obtains.It can increase substantially the conversion ratio and the selectivity of reaction, dwindles the volume of reactor significantly, simplifies technology, flow process, and implementation procedure energy-efficient reduces disposal of pollutants.Research and analysis show, under the hypergravity environment, molecular diffusion between different sized molecules and interphase mass transfer process are all than in after the match faster of terrestrial gravitation, produce the contact of flowing in gas one liquid, liquid-liquid, the liquid one solid porous media of two-phase under the hypergravity environment bigger hundreds of times to thousand times than earth gravitational field, great shear forces makes liquid crushing become nano level film, silk and drips, produce boundary huge and that upgrade fast, make and improve 1~3 order of magnitude in the traditional tower of interphase mass transfer speed ratio, mass transport process is greatly strengthened.
Aspect the energy-conservation regeneration techniques of exploitation new technological process, Uop Inc. early develops steam jet ejector flash regeneration lean solution technology, pressure swing regeneration power-saving technology in recent years and towers regeneration technology, and isolate steam in the regeneration gas and other condensable gas with membrane separating method, will return regenerator as thermal source after its compression.
Aspect the high-gravity technology decarburization, U.S. FlourDaniel company is to H 2S and CO 2Selectivity absorbs to be studied, and utilizes the difference of two component reaction rates, has reached better separating effect.Domestic the most representative is Beijing University of Chemical Technology aspect the high-gravity technology research and development, has carried out a series of innovative research work.At first hypergravity water deoxygenation technology was realized industrial applications in the world in 1998; Cooperated with U.S. DOW chemical company in 1999, and successfully high-gravity technology was applied to the gas liquid reaction separation process in the chlorine industry.And adopt high-gravity technology to resolve the research that synthetic ammonia process purifies the rich solution in the part solution recycle system, be not reported so far both at home and abroad.
Summary of the invention
The purpose of this invention is to provide the method for absorbent rich solution in a kind of deep analysis synthetic-ammonia transformation gas decarbonization technology, it is to resolve absorbent rich solution, KHCO with supergravity reactor as analyzing device 3To be 24.5% benzene Fei Er solution contact with low-pressure steam adverse current or cross-flow in rotating packed bed reactor content, thereby finish the resolving of absorbent rich solution.
Main technical schemes of the present invention:
(a) the absorbent rich solution is sent into the raw material flow container, open steam valve, adjust quantity of steam and respectively material liquid and reaction system are heated to corresponding temperature, adjust the revolution of supergravity reactor by variable-frequency governor, start supergravity reactor, after treating that supergravity reactor is stable, open the liquid reactor inlet valve, send into liquid to reactor by fluid flowmeter.
(b) absorbent rich solution and steam are sent in the rotating packed bed reactor, the absorbent rich solution flows to the rotor outer rim by the rotor inner edge under action of centrifugal force, contact with steam adverse current or cross-flow in rotating packed bed reactor, finish the resolving of absorbent.
In deep analysis synthetic-ammonia transformation gas decarbonization technology provided by the invention in the method for absorbent rich solution, used high-gravity rotating bed including, but not limited to hypergravity whirligigs such as RPB, deflector type, helical duct, fixed-rotor, rotating compact discs.The rotating speed of high-gravity rotating bed rotor is 100~3000 rev/mins, is preferably 300~2000 rev/mins, most preferably is 450~1500 rev/mins.
The absorbent that the present invention is used, employing be hot potassium carbonate solution, sodium hydroxide solution or the potassium hydroxide solution etc. of industrial interpolation activator commonly used.When adopting hot methine solution to be absorbent, used activator is including, but not limited to diethanol amine, ACT-1 etc.
The mass percent concentration of hot potassium carbonate in solution is 20~60% in the described absorbent rich solution, and be preferred 25~40%, especially preferred 30~35%, and the mass percent concentration of activator in solution is 1~5%, preferred 1.5~4%, especially preferred 2~3.5%.
The pressure of system is 0.1~0.5MPa during parsing, is preferably 0.1~0.3MPa, most preferably is 0.1~0.2MPa.The temperature of system is preferably 100~130 ℃ at 80~140 ℃, most preferably is 110~120 ℃.
The invention effect
The invention provides a kind of method that adopts high-gravity rotating bed parsing absorbent rich solution, purpose of the present invention provides a kind of new technology to replace the resolving that traditional technology based on tower equipment is finished the absorbent rich solution, the present invention is with respect to the prior art of resolving the absorbent rich solution with tower, having the absorbent rich solution resolves thoroughly, advantages such as equipment investment is few, and it is little that energy consumption is low, equipment takes up space.KHCO in the rich solution 3Content be 24.5% benzene Fei Er solution through behind the rotating packed bed reactor, KHCO 3Content can drop to below 10%.
Description of drawings
Fig. 1 is a process chart of the present invention.
Wherein: 3-is high-gravity rotating bed for the import of 1-liquid phase import 2-gas phase
The outlet of 4-rotor 5-gaseous phase outlet 6-liquid phase
The specific embodiment
The reacting flow chart of a kind of embodiment of the present invention as shown in Figure 1.Open high-gravity rotating bedly 3, regulate rotating speed to desired speed.The absorbent rich solution is sprayed the inner edge of high-gravity rotating bed rotor 4 by liquid distribution trough via liquid phase inlet tube 1, low-pressure steam enters into rotating packed bed reactor via gas phase inlet tube 2, contact with absorption liquid adverse current or cross-flow in high-gravity rotating bed rotor, under the hypergravity condition, finish KHCO 3Decomposition, the CO2 of discharge discharges from gaseous phase outlet 5, enters follow-up workshop section.The absorbent lean solution flows out from the liquid phase outlet 6 that is positioned at the rotating packed bed reactor bottom.Adopt Q/SY DH0126.02-2001 titrator to analyze HCO in the rotating packed bed reactor outlet liquid 3 -Content.
Embodiment 1
Table 1 absorbent rich solution is formed
Figure BDA0000131987860000041
The regulating system temperature is 120 ℃, pressure is adjusted to 0.2Mpa, start rotating packed bed reactor, adjusting rotor speed is 1200r/m, open the by-pass valve control of liquid reactor import then, absorbent is sprayed the inner edge of high-gravity rotating bed rotor 4 by liquid distribution trough via liquid phase inlet tube 1, the flow of regulating liquid is 50Kg/h, low-pressure steam enters into rotating packed bed reactor by gas phase inlet tube 2, with absorption liquid counter current contacting in high-gravity rotating bed rotor, under the hypergravity condition, finish KHCO 3Decomposition, the CO of discharge 2Discharge from gaseous phase outlet 5, enter follow-up workshop section.The flow of low-pressure steam is 2Kg/h.The absorbent lean solution flows out from the liquid phase outlet 6 that is positioned at the rotating packed bed reactor bottom.Adopt Q/SY DH0126.02-2001 potentiometric titrimeter, analyze HCO in the rotating packed bed reactor outlet liquid 3 -Content.
Embodiment 2-5
Remove the gas liquid ratio in the Change Example 1, all the other are by example 1 conditional operation, and experimental result sees Table 2.
The different gas liquid ratio regeneration test of table 2 result
As can be seen from Table 2, along with reducing gradually of gas liquid ratio, KHCO3 concentration raises gradually in the regeneration lean solution, that is to say, the regeneration of absorbent rich solution is more and more not thorough.At steam/rich solution mass ratio is 1: when (25~50), and KHCO in the lean solution 3Concentration can be reduced to below 10%.Compare with tower equipment, under the equal conditions, reach same parsing effect, tower equipment steam/rich solution mass ratio is generally 1: (18~30), hypergravity equipment steam consumption is compared with tower equipment, obviously reduces.
Embodiment 6-9
Adopt the method for example 1, change regeneration temperature, all the other are by example 1 conditional operation, and experimental result sees Table 3.
Table 3 different temperatures regeneration test result
Figure BDA0000131987860000051
As can be seen from Table 3, along with the rising of temperature, KHCO3 concentration descends gradually in the solution, that is to say that the resolution ratio of KHCO3 improves; When reaction temperature reaches after 120 ℃, curve tends to be steady, and absorbent KHCO3 content is reduced to below 10%, has been lower than the tower regeneration lean solution KHCO3 of factory content (the tower regeneration lean solution KHCO3 of factory content 11%~12%), consider that from energy-saving and cost-reducing angle suitable reaction temperature is 120 ℃.
Embodiment 10-13
Adopt the method for example 1, change rotor revolution number, all the other are by example 1 conditional operation, and experimental result sees Table 4.
Table 4 different rotor revolution regeneration test result
Figure BDA0000131987860000052
As can be seen from Table 4, than the slow-speed of revolution time, KHCO in the absorbent 3Concentration, reduce, but when rotor speed is higher than 1200r/min KHCO in the solution gradually with the increase of rotating speed 3Concentration begins to increase.Analyze its reason, because the revolution of rotor is high more, the size of liquid film, brin and the drop that can cut into liquid becomes littler, and the heat absorption effect can be more better, is beneficial to the carrying out of decomposition reaction; But, when rotating speed surpasses 1200r/min, can cause Partial K HCO because the height of rotating speed can influence the time of staying of material in reactor 3Do not have enough time to decompose and just thrown away packing layer, cause KHCO by rotor 3Decomposition efficiency reduces.Relatively Shi Yi rotor speed is 1200r/min.

Claims (6)

1. method of resolving synthetic-ammonia transformation gas decarbonization absorbent rich solution, it is characterized in that: absorbent rich solution and steam are sent in the rotating packed bed reactor, the absorbent rich solution flows to the rotor outer rim by the rotor inner edge under action of centrifugal force, contact with low-pressure steam adverse current or cross-flow in rotating packed bed reactor, under the hypergravity condition, carry out rich solution regeneration; CO2 after the parsing and the low-pressure steam that carries out after the heat transmission are discharged from gaseous phase outlet, and the solution after the regeneration flows out from the liquid phase outlet that is positioned at the supergravity reactor bottom; The pressure of system is 0.1~0.5MPa during parsing, and temperature is at 90~160 ℃; The rotating speed of rotating packed bed reactor rotor is 100~3000 rev/mins;
Described absorbent rich solution is that the mass percent concentration of carbonic acid first in solution is 20~60%; The mass percent concentration of activator in solution is 1~5%.
2. the method for parsing synthetic-ammonia transformation gas decarbonization absorbent rich solution according to claim 1, it is characterized in that: employed equipment is rotating packed bed reactor, comprises RPB, deflector type hypergravity whirligig, helical duct hypergravity whirligig, fixed-rotor hypergravity whirligig or rotating compact disc hypergravity whirligig.
3. the method for parsing synthetic-ammonia transformation gas decarbonization absorbent rich solution according to claim 1, it is characterized in that: the rotating speed of rotating packed bed reactor rotor is 300~2000 rev/mins minutes.
4. the method for parsing synthetic-ammonia transformation gas decarbonization absorbent rich solution according to claim 1 is characterized in that: the absorbent rich solution absorbs solution behind the CO2 for hot potassium carbonate solution, ammoniacal liquor or the alcamines aqueous solution that adopts industrial interpolation activator commonly used.
5. the method for parsing synthetic-ammonia transformation gas decarbonization absorbent rich solution according to claim 1, it is characterized in that: the pressure of system is 0.1~0.3MPa when resolving.
6. the method for parsing synthetic-ammonia transformation gas decarbonization absorbent rich solution according to claim 1, it is characterized in that: the temperature of system is 100~140 ℃ when resolving.
CN201210016741XA 2012-01-18 2012-01-18 Method for resolving decarburization absorbent rich liquid of synthetic ammonia shift gas Pending CN103212275A (en)

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CN106422667A (en) * 2015-08-04 2017-02-22 北京思践通科技发展有限公司 Method for removing acidic components and water from gas in one step
CN107596903A (en) * 2017-04-14 2018-01-19 蒋本基 Method for capturing carbon dioxide in flue gas by using supergravity carbonating device

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CN110261216B (en) * 2019-06-20 2024-02-27 浙江大学 Material performance testing system under supergravity environment suspension type multi-field coupling effect
CN110982076A (en) * 2019-12-26 2020-04-10 江苏美思德化学股份有限公司 Method for preparing low-volatile polysiloxane by using supergravity device
CN113477188B (en) * 2021-07-02 2023-08-29 北京化工大学 Immersed rotary packed bed reactor and application thereof

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Cited By (3)

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CN106422667A (en) * 2015-08-04 2017-02-22 北京思践通科技发展有限公司 Method for removing acidic components and water from gas in one step
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CN107596903A (en) * 2017-04-14 2018-01-19 蒋本基 Method for capturing carbon dioxide in flue gas by using supergravity carbonating device

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Application publication date: 20130724