CN106731499B - A kind of alkanolamine solution regeneration parsing control system and method - Google Patents
A kind of alkanolamine solution regeneration parsing control system and method Download PDFInfo
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- CN106731499B CN106731499B CN201611208437.XA CN201611208437A CN106731499B CN 106731499 B CN106731499 B CN 106731499B CN 201611208437 A CN201611208437 A CN 201611208437A CN 106731499 B CN106731499 B CN 106731499B
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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
- B01D53/1425—Regeneration of liquid absorbents
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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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Abstract
The present invention provides a kind of alkanolamine solutions to regenerate parsing control system, comprising: Analytic Tower, the Analytic Tower include the acid gas outlet for being set to the rich alkanolamine solution entrance on the Analytic Tower top and being set to the parsing column overhead；The tower reactor reboiler for being set to the parsing tower bottom and being connected to the Analytic Tower, the tower reactor reboiler include poor alkanolamine solution outlet；The temperature control equipment being set in the Analytic Tower, the temperature control equipment are set to 2/3~4/5 height of the effective mass-transfer zone of gas-liquid in the Analytic Tower；Temperature control parameter at the temperature control equipment is 100~115 DEG C.
Description
Technical field
The invention belongs to natural gas technical fields, and in particular to a kind of alkanolamine solution regeneration parsing control system and method.
Background technique
Natural gas, refinery exhaust, synthesis gas and conversion gas etc. contain a certain amount of acid gas (CO2And H2S), due to acid gas
In the presence of, subsequent catalyst can be caused to be poisoned, equipment corrosion, and may cause the generation and energy consumption increase of side reaction；In natural gas
Liquefaction field, CO2Therefore sweetening plant is usually arranged in the exceeded frozen block that can cause cryogenic system in the industrial production, so that
Content of acid gas meets the requirement of subsequent technique process.The removing of sour gas usually has absorption process and absorption method, absorption process
It is commonly available under conditions of acid gas content is high, sour gas load is big, contains Physical Absorption, chemical absorbing and physical chemistry absorption process.
Alcohol amine absorption process is typical chemical absorption method, is widely used in unstripped gas depickling gas field.
Hydramine include monoethanolamine (MEA), diethanol amine (DEA), diisopropanolamine (DIPA) (DIPA), diglycolamine (DGA) and
Methyl diethanolamine (MDEA) etc., the aqueous solution that absorbent solution can be made of two of them or two or more hydramine, can adopt sometimes
Use piperazine etc. as activator, absorbing liquid usually also added antioxidant, corrosion inhibiter and defoaming agent etc..
Alkanolamine solution is transformed into rich alkanolamine solution after absorbing acid gas, and rich alkanolamine solution does not just have the energy that acid gas is removed in depth
Power, it is necessary to rich alkanolamine solution be regenerated, the ability that acid gas is removed in depth in alkanolamine solution can be restored.Rich alkanolamine solution regeneration should use up
Amount carries out under lower pressure, in actual production, usually carries out under conditions of slightly above normal pressure, general to pass through stripping, heat point
Solution mode regenerates, and alkanolamine solution regenerative process usually carries out in alkanolamine solution Analytic Tower, thermal energy required for stripping, thermally decomposing
It is provided by tower bottom reboiler.CN201310456620.1 describes the depickling gas technical process of plural serial stage；
CN200910212788.1 discloses the method for the deeply removing carbon dioxide from admixture of gas；CN201520326787.0 is public
A kind of coke-stove gas preparing liquefied natural gas carbon dioxide in process removing means is opened.It is all made of the mode of amine absorption, rich amine
Liquid realizes regeneration by heating steam stripped mode.
Stripping, the thermal energy of thermal decomposition alkanolamine solution regenerative process consumption are higher, when reboiler cannot provide enough thermal energy
When, alkanolamine solution reproduction quality cannot be guaranteed；It is excessive to provide thermal energy, then it is excessively high to will appear energy consumption, tower operation fluctuation, and tower top is cold
But system loading increases, and easily causes tower bottom overtemperature (more than 122 DEG C), accelerates alkanolamine solution thermal degradation, shortens alkanolamine solution
Service life.Current alkanolamine solution Analytic Tower is generally using the control mode of control tower top temperature, in actual moving process, tower
It is larger to push up temperature change hysteresis quality, tower top temperature variation is insensitive, in temperature adjustment process, does not often occur adjusting excessively or not
The phenomenon of foot, causes Analytic Tower often in fluctuation status, directly affects alkanolamine solution reproduction quality, and lead to alkanolamine solution again
Raw energy consumption is high.
Summary of the invention
In view of this, the technical problem to be solved in the present invention is that provide a kind of alkanolamine solution regeneration parsing control system and
Method, alkanolamine solution regeneration parsing control method provided by the invention is using the sensitive temperature point of alkanolamine solution Analytic Tower as control
Parameter both can guarantee alkanolamine solution reproduction quality, reduces the fluctuation of Analytic Tower, and can reduce energy consumption, extends making for alkanolamine solution
Use the period.
The present invention provides a kind of alkanolamine solutions to regenerate parsing control system, comprising:
Analytic Tower, the Analytic Tower include being set to the rich alkanolamine solution entrance on the Analytic Tower top and being set to institute
State the acid gas outlet of parsing column overhead；
The tower reactor reboiler for being set to the parsing tower bottom and being connected to the Analytic Tower, the tower reactor reboiler include
Poor alkanolamine solution outlet；
The temperature control equipment being set in the Analytic Tower, the temperature control equipment are set to gas in the Analytic Tower
2/3~4/5 height of the effective mass-transfer zone of liquid；
Temperature control parameter at the temperature control equipment is 100~115 DEG C.
It preferably, further include exporting the acid gas processing device being connected with the acid gas, the acid gas processing device includes:
Overhead condenser, the entrance of the overhead condenser are connected with acid gas outlet；
The gas-liquid separator that entrance is connected with the outlet of the overhead condenser, the gas-liquid separator includes liquid outlet
And gas vent, the liquid outlet are connected with the liquid inlet of the Analytic Tower.
Preferably, when the Analytic Tower uses plate column, the tower tray number of the Analytic Tower is 20~30 pieces.
Preferably, the temperature control equipment is located at 2/3~4/5 of tower tray total height in the Analytic Tower from bottom to top
Position.
Preferably, when the Analytic Tower uses packed tower, the filler of filling and 20~30 pieces of column plate height equivalent to one theoretical plate (HETP), the temperature
Degree control device is located at 2/3~4/5 height of filler from bottom to top in the Analytic Tower.
Preferably, the temperature control equipment is using temperature as control parameter, by control tower reactor reboiler heat it is defeated
Enter control of the amount realization to Analytic Tower temperature.
The present invention also provides a kind of method for carrying out alkanolamine solution regeneration parsing control using above system, feature exists
In, comprising the following steps:
The effective mass-transfer zone of Analytic Tower from bottom to top 2/3~4/5 position, temperature control equipment, temperature control are set
Device controls the heat input amount of Analytic Tower tower reactor reboiler, and in tower reactor reboiler, part amine liquid is heated as steam, into
It is flowed up after entering Analytic Tower；The temperature control parameter of temperature control equipment is 100~115 DEG C.
Rich alkanolamine solution enters Analytic Tower top, flows from above to below, the steaming from bottom to top obtained with tower reactor reboiler
Vapour carries out heat transfer and mass transfer, obtains acid gas and poor alkanolamine solution；
The acid gas and steam are exported by acid gas to be discharged；
Poor alkanolamine solution is enriched in the tower reactor reboiler, and from the poor alkanolamine solution outlet stream of the tower reactor reboiler
Out.
Preferably, the processing method of the acid gas are as follows:
The mixed gas of acid gas and steam passes through overhead condenser, obtains acid gas and condensate liquid；
After acid gas and condensate liquid enter gas-liquid separator, acid gas is discharged by the gas vent of the gas-liquid separator, condensation
Liquid enters Analytic Tower by the liquid outlet of the gas-liquid separator.
Compared with prior art, the present invention provides a kind of alkanolamine solutions to regenerate parsing control system, comprising: Analytic Tower,
The Analytic Tower includes being set to the rich alkanolamine solution entrance on the Analytic Tower top and being set to the parsing column overhead
Acid gas outlet；The tower reactor reboiler for being set to the parsing tower bottom and being connected to the Analytic Tower, the tower reactor reboiler packet
Include poor alkanolamine solution outlet；The temperature control equipment being set in the Analytic Tower, the temperature control equipment are set to described
2/3~4/5 height of the effective mass-transfer zone of gas-liquid in Analytic Tower；Temperature control parameter at the temperature control equipment is 100
~115 DEG C.The present invention is using the temperature spot in Thermal desorption sensitive temperature region in alkanolamine solution Thermal desorption tower as control parameter pair
Analytic Tower is controlled, and greatly improves current the shortcomings that generally controlling hysteresis quality using tower top temperature, it is excessive to reduce adjusting
Or insufficient bring tower operation fluctuation, keep alkanolamine solution reproduction quality relatively reliable, Analytic Tower operation is more stable；Heat input
Fluctuating range is smaller, and the probability of amine liquid heat-shock and intensity are reduced in tower reactor, and reducing tower reactor overtemperature causes alkanolamine solution to add
The risk of prompt drop solution extends the service life of amine liquid.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of alkanolamine solution provided by the invention regeneration parsing control system.
Specific embodiment
The present invention provides a kind of alkanolamine solutions to regenerate parsing control system, comprising:
Analytic Tower, the Analytic Tower include being set to the rich alkanolamine solution entrance on the Analytic Tower top and being set to institute
State the acid gas outlet of parsing column overhead；
The tower reactor reboiler for being set to the parsing tower bottom and being connected to the Analytic Tower, the tower reactor reboiler include
Poor alkanolamine solution outlet；
The temperature control equipment being set in the Analytic Tower, the temperature control equipment are set to gas in the Analytic Tower
2/3~4/5 height of the effective mass-transfer zone of liquid；
Temperature control parameter at the temperature control equipment is 100~115 DEG C.
Referring to Fig. 1, parsing control system is regenerated to alkanolamine solution provided by the invention and is described in detail, Fig. 1 is this hair
The structural schematic diagram of the alkanolamine solution regeneration parsing control system of bright offer.In Fig. 1,1 is Analytic Tower, and 2 be overhead condenser, 3
It is poor rich amine solution heat exchanger for tower reactor reboiler, 4.
Alkanolamine solution regeneration parsing control system provided by the invention includes Analytic Tower, and the Analytic Tower includes being set to institute
It states the rich alkanolamine solution entrance on Analytic Tower top and is set to the acid gas outlet of the parsing column overhead.
To the type of the Analytic Tower there is no specifically limited, packed tower and plate column are applicable in the present invention.
When the Analytic Tower is plate column, the tower tray number of the Analytic Tower is 20~30 pieces, preferably 21~25 pieces.
When the Analytic Tower is packed tower, the height of the filler is the height of packing equivalent to one theoretical plate of 20~30 blocks of column plates, excellent
Choosing is 21~25 pieces of heights of packing equivalent to one theoretical plate.
Preferably, the rich alkanolamine solution entrance of the Analytic Tower is set to above the tower tray or filler.
Alkanolamine solution provided by the invention regeneration parsing control system further include be set to the parsing tower bottom and with institute
The tower reactor reboiler of Analytic Tower connection is stated, the tower reactor reboiler includes poor alkanolamine solution outlet.
The tower reactor reboiler is used to provide steam from bottom to top for Analytic Tower, and the heat source of the tower reactor reboiler can be with
Using heating medium for heating such as electricity, water vapour or conduction oils.
Alkanolamine solution regeneration parsing control system provided by the invention further includes the temperature control being set in the Analytic Tower
Device processed, the temperature control equipment are set to 2/3~4/5 height of the effective mass-transfer zone of gas-liquid in the Analytic Tower.
The temperature control equipment control parameter is the temperature parameter at setting, and temperature control equipment passes through control Analytic Tower
The heat input amount of tower reactor reboiler realizes the control to Analytic Tower.
When the Analytic Tower is plate column, it is effective that gas-liquid in the Analytic Tower is set to according to the temperature control equipment
2/3~4/5 height ratio of mass-transfer zone, the temperature control equipment be located at tower tray total height in the Analytic Tower 2/3~
4/5 position.When the tower tray number of the Analytic Tower is 20~30 pieces, the temperature control equipment is located in the Analytic Tower under
The height of the 13rd~24 piece of tower tray on and.
When the Analytic Tower is packed tower, the temperature control equipment is located at filler in the Analytic Tower from bottom to top
2/3~4/5 height.
In the present invention, the temperature control parameter at the temperature control equipment be 100~115 DEG C, preferably 105~
110℃。
Preferably, alkanolamine solution regeneration parsing control system provided by the invention further includes being connected with acid gas outlet
Acid gas processing device, the acid gas processing device include:
Overhead condenser, the entrance of the overhead condenser are connected with acid gas outlet；
The gas-liquid separator that entrance is connected with the outlet of the overhead condenser, the gas-liquid separator includes liquid outlet
And gas vent, the liquid outlet are connected with the liquid inlet of the Analytic Tower.
Preferably, alkanolamine solution regeneration parsing control system provided by the invention further includes poor rich amine solution heat exchanger, described
Poor rich amine solution heat exchanger includes:
Rich alkanolamine solution entrance and rich alkanolamine solution export, the richness of the richness alkanolamine solution outlet and the Analytic Tower top
Alkanolamine solution entrance is connected；
Poor alkanolamine solution entrance and poor alkanolamine solution export, and the poor alkanolamine solution entrance is poor with the tower reactor reboiler
Alkanolamine solution outlet is connected.
The method that alkanolamine solution regeneration parsing controls is carried out using above system the present invention also provides a kind of, including following
Step:
The effective mass-transfer zone of Analytic Tower from bottom to top 2/3~4/5 position, temperature control equipment, temperature control are set
Device controls the heat input amount of Analytic Tower tower reactor reboiler, and in tower reactor reboiler, part amine liquid is heated as steam, into
It is flowed up after entering Analytic Tower.
The temperature control parameter of temperature control equipment is 100~115 DEG C.
Rich alkanolamine solution enters Analytic Tower top, flows from above to below, the steaming from bottom to top obtained with tower reactor reboiler
Vapour carries out heat transfer and mass transfer, obtains acid gas and poor alkanolamine solution；
The acid gas and steam are exported by acid gas to be discharged；
Poor alkanolamine solution is enriched in the tower reactor reboiler, and from the poor alkanolamine solution outlet stream of the tower reactor reboiler
Out.
Preferably, rich alkanolamine solution is after poor rich amine solution heat exchanger is heated, into Analytic Tower top, again with tower reactor
The steam from bottom to top that boiling device obtains carries out heat transfer and mass transfer, obtains acid gas and poor alkanolamine solution；
The acid gas and steam enter acid gas processing device by acid gas outlet and carry out acid gas processing；
Alkanolamine solution flows from above to below to tower reactor reboiler and obtains poor alkanolamine solution, and from the poor of the tower reactor reboiler
Alkanolamine solution outlet outflow, carries out recycling heat by poor rich amine solution heat exchanger；
In the present invention, alkanolamine solution is transformed into the energy that rich alkanolamine solution loses deep removal acid gas after absorbing acid gas
Power is able to achieve alkanolamine solution regeneration by stripping, thermally decomposing, and the ability for making it restore depth depickling gas, detailed process is as follows:
Rich alkanolamine solution first passes around after poor rich amine solution heat exchanger is heated, at the top of alkanolamine solution Analytic Tower, from upper
And lower flowing, and with steam from bottom to top carry out heat transfer and mass transfer, the acid gas of absorption deviate from from alkanolamine solution, into steam
It is flowed up together with steam, stripping, thermal decomposition is completed in alkanolamine solution Analytic Tower, reaches regenerated purpose, flows up
Steam by be arranged in tower bottom tower reactor reboiler generate.Tower bottom is the qualified poor alkanolamine solution of regeneration, and poor alkanolamine solution is first
It by poor rich amine solution heat exchanger, after recycling heat, is then pressurized through pump, is used as absorbent to enter absorption tower top using after cooling
Portion completes alkanolamine solution circulation.
Wherein, the tower top pressure of the alkanolamine solution Analytic Tower operation is 110~180kPa.
For different alkanolamine solutions, rich alkanolamine solution is between 100~115 DEG C, and there are fast resolving areas, in this humidity province
In domain, the acid gas that rich alkanolamine solution absorbs is decomposed comparatively fast, and institute's calorific requirement is more, and macro manifestations are in fast resolving area, rich hydramine
Solution temperature changes greatly.This phenomenon is shown as in Analytic Tower, the tower tray in acid gas fast resolving temperature range, with
The variation of tower tray or the variation of packed height, temperature change is bigger, in the range of 2~3 pieces of tower trays, temperature occur 6~8
DEG C variation, i.e., in the temperature region, the temperature difference between upper and lower two pieces of tower trays is likely to be breached 2.3~3 DEG C, and in the tower tray area
Other positions in overseas tower, temperature with the variation of tower tray or packed height then than more gentle, complete the average tower tray temperature difference of tower is 1 DEG C
Left and right.Due to the temperature of adjacent trays in fast resolving temperature region change compared with tower top temperature it is bigger, when making for some reason
When at tower operation change, tray temperature variation is more significant in the temperature region, using this characteristic, controls Analytic Tower,
Control will be made more effective, it is sensitiveer.
For the reproduction quality for guaranteeing poor alkanolamine solution, Analytic Tower generally requires 20 pieces~30 pieces or so tower trays or contour fills out
Material, after obtaining Analytic Tower control temperature sensitive areas, sensitive temperature area tower tray is distributed in the 2/3~4/5 of the effective mass-transfer zone of gas-liquid
Position, therefore, only needed in actual design according to tray efficiency to full tower carry out theoretical calculation, temperature can be quickly obtained
The position of sensitive plate, the plate, which is arranged in, in the temperature control point of full tower can be realized effective control to tower.
The present invention is using the temperature spot in Thermal desorption sensitive temperature region in alkanolamine solution Thermal desorption tower as control parameter pair
Analytic Tower is controlled, and greatly improves current the shortcomings that generally controlling hysteresis quality using tower top temperature, it is excessive to reduce adjusting
Or insufficient bring tower operation fluctuation, keep alkanolamine solution reproduction quality relatively reliable, Analytic Tower operation is more stable；Heat input
Fluctuating range is smaller, and the probability of amine liquid heat-shock and intensity are reduced in tower reactor, and reducing tower reactor overtemperature causes alkanolamine solution to add
The risk of prompt drop solution extends the service life of amine liquid.
For a further understanding of the present invention, parsing control is regenerated to alkanolamine solution provided by the invention below with reference to embodiment
System and method are illustrated, and protection scope of the present invention is not limited by the following examples.
Embodiment 1
A kind of alkanolamine solution regeneration parsing control system is present embodiments provided, including Analytic Tower, the Analytic Tower include
It is set to the rich alkanolamine solution entrance on the Analytic Tower top and is set to the acid gas outlet of the parsing column overhead.
The tower reactor reboiler for being set to the parsing tower bottom and being connected to the Analytic Tower, the tower reactor reboiler include
Poor alkanolamine solution outlet.The tower reactor reboiler is used to provide steam from bottom to top for Analytic Tower, the tower reactor reboiler
Heat source can be using heating medium for heating such as electricity, steam or conduction oils.
The temperature control equipment being set in the Analytic Tower.
The alkanolamine solution regeneration parsing control system further includes exporting the acid gas processing device being connected, institute with the acid gas
Stating acid gas processing device includes: overhead condenser, and the entrance of the overhead condenser is connected with acid gas outlet；Entrance and institute
The connected gas-liquid separator in the outlet of overhead condenser is stated, the gas-liquid separator includes liquid outlet and gas vent, institute
Liquid outlet is stated to be connected with the liquid inlet of the Analytic Tower.
The alkanolamine solution regeneration parsing control system further includes poor rich amine solution heat exchanger, the poor rich amine solution heat exchanger packet
Include: rich alkanolamine solution entrance and rich alkanolamine solution export, the rich hydramine of the richness alkanolamine solution outlet and the Analytic Tower top
Solution inlet is connected；Poor alkanolamine solution entrance and poor alkanolamine solution export, and the poor alkanolamine solution entrance boils again with the tower reactor
The poor alkanolamine solution outlet of device is connected.
The present embodiment is with the acid gas (CO in natural gas liquefaction process in MDEA solution removal natural gas2+H2S it for), uses
Embodiment 1 provide system, to alkanolamine solution regenerate parsing control method be illustrated, involved in parameter it is as follows:
Alkanolamine solution concentration (MDEA40%wt, piperazine 5%wt, water 55%wt).
Rich alkanolamine solution sour gas load 30%
Rich alkanolamine solution internal circulating load, 14.6m3/h
Alkanolamine solution Analytic Tower tower, valve tower
Alkanolamine solution Analytic Tower tower diameter, 800mm
Alkanolamine solution parsing tower tray floor number, 21
Alkanolamine solution Analytic Tower operating pressure, tower top 155kPaA
Rich alkanolamine solution fast resolving temperature range, 100~107 DEG C.
Tower tray number locating for temperature control point and control temperature, the 16th piece of tower tray from bottom to top, 103 DEG C.
Rich alkanolamine solution from absorber portion first passes around after poor rich amine solution heat exchanger 4 is heated, into alkanolamine solution solution
The top of tower 1 is analysed, is flowed from above to below, and carries out heat transfer and mass transfer with steam from bottom to top, the acid gas of absorption is from alkanolamine solution
Middle abjection flows up together with steam into steam, and stripping, thermal decomposition are completed in alkanolamine solution Analytic Tower, reaches regeneration
Purpose, the steam flowed up generates by the reboiler 3 that tower bottom is arranged in.Tower bottom is the qualified poor alkanolamine solution of regeneration, poor
Alkanolamine solution first passes around poor rich amine solution heat exchanger, after recycling heat, is then pressurized through pump, using being used as absorbent after cooling
Into absorption section.
The parameter of the above method is measured and is controlled, the results are shown in Table 1.Table 1 provides for embodiment and comparative example
Method parameter and result.
Embodiment 2
The present embodiment is with the acid gas (CO in natural gas liquefaction process in MDEA solution removal natural gas2+H2S it for), uses
Embodiment 1 provide system, to alkanolamine solution regenerate parsing control method be illustrated, involved in parameter it is as follows:
Alkanolamine solution concentration (MDEA 42%wt, piperazine 5%wt, water 53%wt).
Rich alkanolamine solution sour gas load 29%
Rich alkanolamine solution internal circulating load, 24.8m3/h
Alkanolamine solution Analytic Tower tower, valve tower
Alkanolamine solution Analytic Tower tower diameter, 1000mm
Alkanolamine solution parsing tower tray floor number, 24
Alkanolamine solution Analytic Tower operating pressure, tower top 167kPaA
Rich alkanolamine solution fast resolving temperature range, 101~109 DEG C.
Tower tray number locating for temperature control point and control temperature, 16,107.8 DEG C from bottom to top.
Rich alkanolamine solution from absorber portion first passes around after poor rich amine solution heat exchanger 4 is heated, into alkanolamine solution solution
The top of tower 1 is analysed, is flowed from above to below, and carries out heat transfer and mass transfer with steam from bottom to top, the acid gas of absorption is from alkanolamine solution
Middle abjection flows up together with steam into steam, and stripping, thermal decomposition are completed in alkanolamine solution Analytic Tower, reaches regeneration
Purpose, the steam flowed up generates by the reboiler 3 that tower bottom is arranged in, the heat source of reboiler can using electricity, steam or
The heating medium for heating such as conduction oil.Tower bottom is the qualified poor alkanolamine solution of regeneration, and poor alkanolamine solution first passes around poor rich amine solution heat exchanger,
It after recycling heat, is then pressurized through pump, is used as absorbent to enter absorption section using after cooling.
The parameter of the above method is measured and is controlled, the results are shown in Table 1.Table 1 provides for embodiment and comparative example
Method parameter and result.
Embodiment 3
The present embodiment is with the acid gas (CO in natural gas liquefaction process in MDEA solution removal natural gas2+H2S it for), uses
Embodiment 1 provide system, to alkanolamine solution regenerate parsing control method be illustrated, involved in parameter it is as follows:
Alkanolamine solution concentration (MDEA 39%wt, piperazine 4.5%wt, water 56.5%wt).
Rich alkanolamine solution sour gas load 31%
Rich alkanolamine solution internal circulating load, 14.6m3/h
Alkanolamine solution Analytic Tower tower, valve tower
Alkanolamine solution Analytic Tower tower diameter, 800mm
Alkanolamine solution parsing tower tray floor number, 21
Alkanolamine solution Analytic Tower operating pressure, tower top 155kPaA
Rich alkanolamine solution fast resolving temperature range, 100~107 DEG C.
Tower tray number locating for temperature control point and control temperature, 15,105.2 DEG C from bottom to top.
Rich alkanolamine solution from absorber portion first passes around after poor rich amine solution heat exchanger 4 is heated, into alkanolamine solution solution
The top of tower 1 is analysed, is flowed from above to below, and carries out heat transfer and mass transfer with steam from bottom to top, the acid gas of absorption is from alkanolamine solution
Middle abjection flows up together with steam into steam, and stripping, thermal decomposition are completed in alkanolamine solution Analytic Tower, reaches regeneration
Purpose, the steam flowed up generates by the reboiler 3 that tower bottom is arranged in.Tower bottom is the qualified poor alkanolamine solution of regeneration, poor
Alkanolamine solution first passes around poor rich amine solution heat exchanger, after recycling heat, is then pressurized through pump, using being used as absorbent after cooling
Into absorption section.
The parameter of the above method is measured and is controlled, the results are shown in Table 1.Table 1 provides for embodiment and comparative example
Method parameter and result.
Embodiment 4
The present embodiment is with the acid gas (CO in natural gas liquefaction process in MDEA solution removal natural gas2+H2S it for), uses
Embodiment 1 provide system, to alkanolamine solution regenerate parsing control method be illustrated, involved in parameter it is as follows:
Alkanolamine solution concentration (MDEA 40%wt, piperazine 5%wt, water 55%wt).
Rich alkanolamine solution sour gas load 30%
Rich alkanolamine solution internal circulating load, 14.6m3/h
Alkanolamine solution Analytic Tower tower, structured packing 250Y corrugated plate dst filler
Alkanolamine solution Analytic Tower tower diameter, 760mm
Packed height, 12000mm
Alkanolamine solution Analytic Tower operating pressure, tower top 157kPaA
Rich alkanolamine solution fast resolving temperature range, 100~107 DEG C.
Tower tray number locating for temperature control point and control temperature, 9000mm from bottom to top, 104.8 DEG C.
Rich alkanolamine solution from absorber portion first passes around after poor rich amine solution heat exchanger 4 is heated, into alkanolamine solution solution
The top of tower 1 is analysed, is flowed from above to below, and carries out heat transfer and mass transfer with steam from bottom to top, the acid gas of absorption is from alkanolamine solution
Middle abjection flows up together with steam into steam, and stripping, thermal decomposition are completed in alkanolamine solution Analytic Tower, reaches regeneration
Purpose, the steam flowed up generates by the reboiler 3 that tower bottom is arranged in.Tower bottom is the qualified poor alkanolamine solution of regeneration, poor
Alkanolamine solution first passes around poor rich amine solution heat exchanger, after recycling heat, is then pressurized through pump, using being used as absorbent after cooling
Into absorption section.
The parameter of the above method is measured and is controlled, the results are shown in Table 1.Table 1 provides for embodiment and comparative example
Method parameter and result.
Comparative example
A kind of alkanolamine solution regeneration parsing control system generallyd use at present, including Analytic Tower are present embodiments provided,
The Analytic Tower includes being set to the rich alkanolamine solution entrance on the Analytic Tower top and being set to the parsing column overhead
Acid gas outlet.
The tower reactor reboiler for being set to the parsing tower bottom and being connected to the Analytic Tower, the tower reactor reboiler include
Poor alkanolamine solution outlet.The tower reactor reboiler is used to provide steam from bottom to top for Analytic Tower, the tower reactor reboiler
Heat source can be using heating medium for heating such as electricity, steam or conduction oils.
The temperature control equipment being set in the Analytic Tower, the temperature control equipment are set to the top of the Analytic Tower
Portion.
The alkanolamine solution regeneration parsing control system further includes exporting the acid gas processing device being connected, institute with the acid gas
Stating acid gas processing device includes: overhead condenser, and the entrance of the overhead condenser is connected with acid gas outlet；Entrance and institute
The connected gas-liquid separator in the outlet of overhead condenser is stated, the gas-liquid separator includes liquid outlet and gas vent, institute
Liquid outlet is stated to be connected with the liquid inlet of the Analytic Tower.
The alkanolamine solution regeneration parsing control system further includes poor rich amine solution heat exchanger, the poor rich amine solution heat exchanger packet
Include: rich alkanolamine solution entrance and rich alkanolamine solution export, the rich hydramine of the richness alkanolamine solution outlet and the Analytic Tower top
Solution inlet is connected；Poor alkanolamine solution entrance and poor alkanolamine solution export, and the poor alkanolamine solution entrance boils again with the tower reactor
The poor alkanolamine solution outlet of device is connected.
With the acid gas (CO in natural gas liquefaction process in MDEA solution removal natural gas2+H2S it for), is mentioned using comparative example
The system of confession, to alkanolamine solution regenerate parsing control method be illustrated, involved in parameter it is as follows:
Alkanolamine solution concentration (MDEA 40%wt, piperazine 5%wt, water 55%wt).
Rich alkanolamine solution sour gas load 30%
Rich alkanolamine solution internal circulating load, 15.8m3/h
Alkanolamine solution Analytic Tower tower, valve tower
Alkanolamine solution Analytic Tower tower diameter, 800mm
Alkanolamine solution parsing tower tray floor number, 21
Alkanolamine solution Analytic Tower operating pressure, tower top 155kPaA
Rich alkanolamine solution fast resolving temperature range, 100~107 DEG C.
Temperature control point and control temperature, tower top, 96 DEG C.
Rich alkanolamine solution from absorber portion first passes around after poor rich amine solution heat exchanger 4 is heated, into alkanolamine solution solution
The top of tower 1 is analysed, is flowed from above to below, and carries out heat transfer and mass transfer with steam from bottom to top, the acid gas of absorption is from alkanolamine solution
Middle abjection flows up together with steam into steam, and stripping, thermal decomposition are completed in alkanolamine solution Analytic Tower, reaches regeneration
Purpose, the steam flowed up generates by the reboiler 3 that tower bottom is arranged in.Tower bottom is the qualified poor alkanolamine solution of regeneration, poor
Alkanolamine solution first passes around poor rich amine solution heat exchanger, after recycling heat, is then pressurized through pump, using being used as absorbent after cooling
Into absorption section.
The parameter of the above method is measured and is controlled, the results are shown in Table 1.Table 1 provides for embodiment and comparative example
Method parameter and result.
The parameter and result for the method that 1 embodiment of table and comparative example provide
Table 1 gives comparison of the embodiment with the tower top temperature point that generallys use as control parameter, from the knot in table
Fruit can be seen that using control mode of the invention, and Analytic Tower operation is more stable, and after being interfered, Analytic Tower is restored to surely
Determine to be obviously shortened the time required to state；The fluctuating range of tower reactor reboiler heat is also obviously improved；Due to hyperharmonic less stress
Phenomenon is greatly improved, in such a way that control mode of the invention is in energy consumption also superior to using tower top temperature control；
Tower reactor reboiler thermal fluctuation is smaller, so that tower reactor amine liquid heat-shock is improved well, when ten thousand/diamines liquid is degraded
Between significantly improve, the service life of amine liquid is significantly increased.
The above is only a preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications are also answered
It is considered as protection scope of the present invention.
Claims (8)
1. a kind of alkanolamine solution regeneration parsing control system characterized by comprising
Analytic Tower, the Analytic Tower include being set to the rich alkanolamine solution entrance on the Analytic Tower top and being set to the solution
Analyse the acid gas outlet of column overhead；
The tower reactor reboiler for being set to the parsing tower bottom and being connected to the Analytic Tower, the tower reactor reboiler includes poor alcohol
Amine aqueous solution outlet；
The temperature control equipment being set in the Analytic Tower, the temperature control equipment, which is set to gas-liquid in the Analytic Tower, to be had
Imitate 2/3~4/5 height of mass-transfer zone；
Temperature control parameter at the temperature control equipment is 100~115 DEG C.
2. system according to claim 1, which is characterized in that further include that the acid gas processing being connected with acid gas outlet fills
It sets, the acid gas processing device includes:
Overhead condenser, the entrance of the overhead condenser are connected with acid gas outlet；
The gas-liquid separator that entrance is connected with the outlet of the overhead condenser, the gas-liquid separator include liquid outlet and
Gas vent, the liquid outlet are connected with the liquid inlet of the Analytic Tower.
3. system according to claim 1, which is characterized in that when the Analytic Tower uses plate column, the Analytic Tower
Tower tray number is 20~30 pieces.
4. system according to claim 3, which is characterized in that the temperature control equipment is located at tower tray in the Analytic Tower
2/3~4/5 position of total height from bottom to top.
5. system according to claim 1, which is characterized in that when the Analytic Tower uses packed tower, filling and 20~30
The filler of the block column plate height equivalent to one theoretical plate (HETP), the temperature control equipment are located at 2/3~4/5 of filler in the Analytic Tower from bottom to top
Highly.
6. system according to claim 1, which is characterized in that the temperature control equipment leads to using temperature as control parameter
Cross control of the input quantity realization of the heat of control tower reactor reboiler to Analytic Tower temperature.
7. a kind of method that alkanolamine solution regeneration parsing control is carried out using system described in claim 1~6 any one,
It is characterized in that, comprising the following steps:
The effective mass-transfer zone of Analytic Tower from bottom to top 2/3~4/5 position, be arranged temperature control equipment, the temperature control equipment
The heat input amount of Analytic Tower tower reactor reboiler is controlled, in tower reactor reboiler, part amine liquid is heated as steam, into solution
It is flowed up after analysis tower；The temperature control parameter of temperature control equipment is 100~115 DEG C；
Rich alkanolamine solution enters Analytic Tower top, flows from above to below, the steam from bottom to top obtained with tower reactor reboiler into
Row heat transfer and mass transfer, obtain acid gas and poor alkanolamine solution；
The acid gas and steam are exported by acid gas to be discharged；
Poor alkanolamine solution is enriched in the tower reactor reboiler, and is exported and flowed out from the poor alkanolamine solution of the tower reactor reboiler.
8. the method according to the description of claim 7 is characterized in that the processing method of the acid gas are as follows:
The mixed gas of acid gas and steam passes through overhead condenser, obtains acid gas and condensate liquid；
After acid gas and condensate liquid enter gas-liquid separator, acid gas is discharged by the gas vent of the gas-liquid separator, condensate liquid by
The liquid outlet of the gas-liquid separator enters Analytic Tower.
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