CN109351132A - Gas absorption process, gas absorbing device and application thereof - Google Patents
Gas absorption process, gas absorbing device and application thereof Download PDFInfo
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- CN109351132A CN109351132A CN201811364190.XA CN201811364190A CN109351132A CN 109351132 A CN109351132 A CN 109351132A CN 201811364190 A CN201811364190 A CN 201811364190A CN 109351132 A CN109351132 A CN 109351132A
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- absorptive unit
- gas
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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
- B01D53/18—Absorbing units; Liquid distributors therefor
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- 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
- B01D53/1406—Multiple stage absorption
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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
- B01D53/18—Absorbing units; Liquid distributors therefor
- B01D53/185—Liquid distributors
Abstract
The present invention provides a kind of gas absorption process, gas absorbing device and application thereof, it is related to chemical field, the gas absorption process, the following steps are included: absorbing liquid successively pass through the first absorptive unit ..., N absorptive unit, gas to be absorbed successively pass through N absorptive unit ..., the first absorptive unit, in each absorptive unit, absorbing liquid flows downward with gas cocurrent to be absorbed；Wherein, N is the natural number more than or equal to 2.Using the gas absorption process be able to solve current gas absorption process number of theoretical plate it is low, easily general liquid and move heat not in time caused by assimilation effect difference technical problem, reached raising absorption efficiency and assimilation effect technical effect.
Description
Technical field
The present invention relates to chemical fields, more particularly, to a kind of gas absorption process, gas absorbing device and application thereof.
Background technique
In chemical engineering, absorption processing usually is carried out to gas with liquid, to achieve the purpose that purifying or purification.In liquid
Body absorb gas during, influence gas adsorption effect because being known as: solubility, temperature, absorption pressure, number of theoretical plate (gas-
Liquid, which is sufficiently mixed, to be reached balance and separately calculates one piece of theoretical plate) etc..Absorption pressure is higher more advantageous to absorbing, that is to say, that
The pressure loss of gas wants small in absorption process.Number of theoretical plate is more, and more substances to be absorbed enters liquid phase from gas phase.Generally
For solubility with temperature increase and reduce, and dissolving is exothermic process, so cooling shifting is hot while absorbing, be can promote
The progress of absorption.
Currently, there is the gas absorption pattern of practical application in chemical engineering industry: plate column/packed tower absorption, vertical heat exchanging pipe
Gas and liquid flowing absorbs downwards in interior gas-liquid counter current suction and vertical heat exchanging pipe.
1) plate column/packed tower absorbs: its advantage is that gas-liquid counter current contacts, it is equivalent to muti-piece theoretical plate, it theoretically can be with
Reach higher degree of absorption；The disadvantage is that being difficult that heat-exchanger rig is arranged in tower.After initial stage absorbs heating, liquid, which loses, to be continued to absorb
Ability, absorption efficiency be not high instead.Improved method is setting external circulating system, uses circulating pump, recirculation cooler, part tower bottom
Tower top is returned to after liquid circulation temperature lowering.Although temperature in tower can be reduced by doing so, the liquid returned is equivalent to tower bottom liquid, dense
Degree is very high, seriously destroys liquid concentration gradient from top to bottom in tower, is reduced to absorption approach plate number close to one piece, and
The use of pump must consume electric energy.
2) the problem of gas-liquid counter current absorbs in vertical heat exchanging pipe, the absorption pattern is that the gas of rising is to liquid
Flow downward and generate frictional force, cause liquid flowing slack-off, liquid film thickens, and gas flow channel reduces, and gas velocity increases, to liquid
The active force of body further increases, vicious circle, ultimately causes the complete passage of liquid film, and liquid pushes upper fortune to by gas arch
Dynamic, i.e. liquid flooding state, absorption is entirely ineffective.
3) gas and liquid flowing absorbs downwards in vertical heat exchanging pipe: gas and liquid flowing is downward, liquid flooding problem is not present, gas flow rate can
With very high, number of heat exchange tubes and actual internal area rationally can be set according to the volume flow of absorbing liquid.But in the absorption pattern
Gas and liquid flowing can not form absorption strength gradient, and final assimilation effect just corresponds to one piece of theoretical plate, and assimilation effect is very poor.
Summary of the invention
The first object of the present invention is to provide a kind of gas absorption process, at least to alleviate above-mentioned mentioned technical problem
In one.
The second object of the present invention is to provide a kind of gas absorbing device, to alleviate in above-mentioned existing gas absorbing device
At least one existing problem.
The third object of the present invention is to provide a kind of purposes of gas absorbing device, to improve the clean-up effect of gas.
In order to realize above-mentioned purpose of the invention, the following technical scheme is adopted:
A kind of gas absorption process, comprising the following steps:
Absorbing liquid successively pass through the first absorptive unit ..., N absorptive unit, gas to be absorbed successively pass through N absorb it is single
Member ..., the first absorptive unit, in each absorptive unit, the absorbing liquid flows downward with the gas cocurrent to be absorbed；Its
In, N is the natural number more than or equal to 2.
Further, the natural number between N value 3-6.
Further, the absorbing liquid under Gravitative Loads successively by the first absorptive unit ... and N absorb it is single
Member.
Further, first absorptive unit ..., to the N absorptive unit in short transverse with step arrangement
Mode connects, wherein the level height of first absorptive unit is higher than the level height of the N absorptive unit.
Further, first absorptive unit ..., the N absorptive unit, each absorptive unit includes one vertical
Formula tubular heat exchanger.
Further, absorbing liquid entrance and gas entrance to be absorbed, institute is respectively set in the top of the vertical array tubular heat exchanger
Absorbing liquid outlet and gas to be absorbed outlet is respectively set in the lower part for stating vertical array tubular heat exchanger, manages in the vertical array tubular heat exchanger
The bottom of journey is equipped with gas-liquid separator；Wherein,
The water of level height >=second absorptive unit absorbing liquid entrance of the absorbing liquid outlet of first absorptive unit
Flat height,
And so on,
The water of level height >=N absorptive unit absorbing liquid entrance of the absorbing liquid outlet of the N-1 absorptive unit
Flat height.
A kind of gas absorbing device, comprising:
N number of absorptive unit, wherein
Absorbing liquid successively pass through the first absorptive unit ..., N absorptive unit, gas to be absorbed successively pass through N absorb it is single
Member ..., the first absorptive unit, in each absorptive unit, the absorbing liquid flows downward with the gas cocurrent to be absorbed；N
For the natural number more than or equal to 2.
Further, it is successively in the first absorption of step arrangement connection that shown gas absorbing device, which includes: in short transverse,
Unit ..., N absorptive unit wherein, the level height of first absorptive unit is higher than the level of the N absorptive unit
Highly.
Further, each absorptive unit includes a vertical array tubular heat exchanger, tube side in the vertical array tubular heat exchanger
Bottom be equipped with gas-liquid separator；
Preferably, absorbing liquid entrance and gas entrance to be absorbed is respectively set in the top of the vertical array tubular heat exchanger, each
Absorbing liquid outlet and gas to be absorbed outlet is respectively set in absorptive unit lower part；
The level of level height >=second absorptive unit absorbing liquid entrance of the absorbing liquid outlet of first absorptive unit is high
Degree, and so on, the water of level height >=N absorptive unit absorbing liquid entrance of the absorbing liquid outlet of N-1 absorptive unit
Flat height.
Purposes of the above-mentioned gas absorption plant in gas purification processing.
Compared with the prior art, the invention has the following beneficial effects:
Gas absorption process provided by the invention, belongs to multistage absorption method.Inside each absorptive unit, belong to gas
The downward absorption pattern of liquid cocurrent, air velocity can be very high, and liquid flooding problem is not present；In terms of entire absorption process, gas-liquid absorbs
Liquid successively pass through the first absorptive unit ..., N absorptive unit, and gas to be absorbed then successively pass through from opposite direction N absorb it is single
Member ..., the first absorptive unit, gas-liquid two-phase formed countercurrent movement, assimilation effect close to multistage theoretical plate absorption limit,
Assimilation effect is very good.The absorption process belongs to completely new gas processing method that is in the same direction and reversely combining, absorbing liquid flowing
Direction is single, has preferable concentration gradient, meanwhile, in each absorptive unit, absorbing liquid and gas cocurrent to be absorbed are transported downwards
Dynamic, gas to be absorbed can have higher gas flow rate, without the problems such as blocking with general liquid occurs, there is preferable absorb to imitate
Fruit.
Gas absorbing device provided by the invention innovatively organically combines gas-liquid co-flow and gas-liquid reverse flow
Together, it in the vertical heat exchanging pipe simple relative to tradition for gas-liquid counter current absorption equipment, solves its easily generation liquid flooding and leads
The problem of causing blocking；For the downward absorption equipment of gas and liquid flowing in traditional vertical heat exchanging pipe, solves its absorption
Number of theoretical plate is low, the problem of assimilation effect difference.Gas and liquid flowing can be provided simultaneously with using gas absorbing device provided by the invention
The double effects absorbed upwards with gas and liquid flowing are absorbed downwards, and then improve the efficiency and effect of gas absorption.
Detailed description of the invention
It, below will be to specific in order to illustrate more clearly of the specific embodiment of the invention or technical solution in the prior art
Embodiment or attached drawing needed to be used in the description of the prior art be briefly described, it should be apparent that, it is described below
Attached drawing is some embodiments of the present invention, for those of ordinary skill in the art, before not making the creative labor
It puts, is also possible to obtain other drawings based on these drawings.
Fig. 1 is the processing technological flow schematic diagram in the embodiment of the present invention 1；
Fig. 2 is the processing technological flow schematic diagram in comparative example 1 of the present invention；
Fig. 3 is the processing technological flow schematic diagram in comparative example 2 of the present invention.
Icon: the first absorptive unit of 10-；The second absorptive unit of 20-；30- third absorptive unit.
Specific embodiment
Technical solution of the present invention is clearly and completely described below in conjunction with attached drawing, it is clear that described implementation
Example is a part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, ordinary skill
Personnel's every other embodiment obtained without making creative work, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that term " center ", "upper", "lower", "left", "right", "vertical",
The orientation or positional relationship of the instructions such as "horizontal", "inner", "outside" be based on the orientation or positional relationship shown in the drawings, merely to
Convenient for description the present invention and simplify description, rather than the device or element of indication or suggestion meaning must have a particular orientation,
It is constructed and operated in a specific orientation, therefore is not considered as limiting the invention.In addition, term " first ", " second ",
" third " is used for descriptive purposes only and cannot be understood as indicating or suggesting relative importance.
In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, term " installation ", " phase
Even ", " connection " shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or be integrally connected；It can
To be mechanical connection, it is also possible to be electrically connected；It can be directly connected, can also can be indirectly connected through an intermediary
Connection inside two elements.For the ordinary skill in the art, above-mentioned term can be understood as the case may be
Concrete meaning in the present invention.
On the one hand, the present invention provides a kind of gas absorption process, comprising the following steps:
Absorbing liquid successively pass through the first absorptive unit ..., N absorptive unit, gas to be absorbed successively pass through N absorb it is single
Member ..., the first absorptive unit, in each absorptive unit, absorbing liquid flows downward with gas cocurrent to be absorbed；Wherein, N is big
In the natural number for being equal to 2.
Gas absorption process provided by the invention, belongs to multistage absorption method.Inside each absorptive unit, belong to gas
The downward absorption pattern of liquid cocurrent, air velocity can be very high, and liquid flooding problem is not present；In terms of entire absorption process, gas-liquid absorbs
Liquid successively pass through the first absorptive unit ..., N absorptive unit, and gas to be absorbed then successively pass through from opposite direction N absorb it is single
Member ..., the first absorptive unit, gas-liquid two-phase formed countercurrent movement, assimilation effect close to multistage theoretical plate absorption limit,
Assimilation effect is very good.The absorption process belongs to completely new gas processing method that is in the same direction and reversely combining, absorbing liquid flowing
Direction is single, has preferable concentration gradient, meanwhile, in each absorptive unit, absorbing liquid and gas cocurrent to be absorbed are transported downwards
Dynamic, gas to be absorbed can have higher gas flow rate, without the problems such as blocking with general liquid occurs, there is preferable absorb to imitate
Fruit.
In order to improve the assimilation effect of gas, multistage absorption unit can be set.In certain embodiments of the present invention,
N is the natural number being derived between 3-6.When the purity of gas to be processed is relatively high, two-stage can be set, also can be set into three
Grade or level Four or Pyatyi absorptive unit, correspondingly, the value of N can be 2,3 and 4；When gas to be processed have more impurity gas or
When needing to be greatly reduced the wherein content of a certain component gas, the processing unit of more series can be set, correspondingly, N's takes
Value can be 5 and 6 etc..
In certain embodiments of the present invention, absorbing liquid under Gravitative Loads successively by the first absorptive unit ...,
With N absorptive unit.Absorbing liquid all leans on flow by gravity either between grade or in grade, can effectively avoid using the energy consumption such as pump
Equipment, it is energy saving, reduce operating cost.
In certain embodiments of the present invention, the first absorptive unit ..., to N absorptive unit short transverse with
Step arrangement mode connects, wherein the level height of the first absorptive unit is higher than the level height of N absorptive unit.
Connected and referred in a manner of step arrangement, the first absorptive unit ..., N absorptive unit be located at different height positions
It sets, height and position is successively reduced from the first absorptive unit to N absorptive unit, in this way, absorbing liquid is since the first absorptive unit,
The gravity that can use itself flows downward, and can gradually flow to N absorptive unit from the first absorptive unit.
In certain embodiments of the present invention, the first absorptive unit ..., N absorptive unit, each absorptive unit is equal
Including a vertical array tubular heat exchanger.Using vertical array tubular heat exchanger, absorbing liquid and gas to be absorbed flow in the tube side of heat exchanger,
And heat-conducting medium can be passed through in the shell side of heat exchanger, such as the media such as recirculated water drop absorbing liquid to take away heat
Temperature processing, to reduce the decline of absorption efficiency caused by temperature rise.
In certain embodiments of the present invention, the top of vertical array tubular heat exchanger is respectively set absorbing liquid entrance and wait inhale
Absorbing liquid outlet and gas to be absorbed outlet, vertical array tubular heat exchanger is respectively set in getter entrance, the lower part of vertical array tubular heat exchanger
The bottom of middle tube side is equipped with gas-liquid separator；Wherein,
The level of level height >=second absorptive unit absorbing liquid entrance of the absorbing liquid outlet of first absorptive unit is high
Degree,
And so on,
The level of level height >=N absorptive unit absorbing liquid entrance of the absorbing liquid outlet of N-1 absorptive unit is high
Degree.
Wherein, the water of level height >=second absorptive unit absorbing liquid entrance of the absorbing liquid outlet of the first absorptive unit
Flat height refers to, the level of the absorbing liquid entrance of the horizontal position and the second absorptive unit of the absorbing liquid outlet of the first absorptive unit
Position is concordant, or the horizontal position of the absorbing liquid entrance higher than the second absorptive unit；Similarly, the absorbing liquid of N-1 absorptive unit
The level height of the level height of outlet >=N absorptive unit absorbing liquid entrance refers to that the absorbing liquid of N-1 absorptive unit goes out
The horizontal position of mouth is concordant with the horizontal position of absorbing liquid entrance of N absorptive unit, or higher than the absorbing liquid of N absorptive unit
The horizontal position of entrance.
In use, according to absorbing liquid followed by the first absorptive unit, second between absorbing liquid entrance and absorbing liquid outlet
The sequential connection of absorptive unit and third absorptive unit；For example, absorbing liquid outlet and the second absorptive unit of the first absorptive unit
The connection of absorbing liquid entrance, and so on, the absorbing liquid entrance of the absorbing liquid of N-1 absorptive unit outlet and N absorptive unit
Connection.
Meanwhile in each absorptive unit, successively flowed between gas entrance to be absorbed and gas to be absorbed outlet according to gas to be absorbed
Sequential connection through third absorptive unit, the second absorptive unit and the first absorptive unit；For example, N absorptive unit is to be absorbed
Gas outlet connect with the gas entrance to be absorbed of N-1 absorptive unit, and so on, the gas to be absorbed of the second absorptive unit export and
The gas entrance to be absorbed of first absorptive unit connects.
The top of vertical array tubular heat exchanger is respectively equipped with absorbing liquid entrance and gas entrance to be absorbed, for example, absorbing liquid entrance
Top or near top in vertical array tubular heat exchanger, the lower part of vertical array tubular heat exchanger can be set with gas entrance to be absorbed
Not She Zhi absorbing liquid export and gas to be absorbed outlet, for example, absorbing liquid outlet and gas to be absorbed outlet can be set in vertical column
The bottom of heat exchange of heat pipe or bottom appendix.The setting structure can guarantee the absorbing liquid in vertical array tubular heat exchanger in gravity
Under flow from top to bottom, and gas to be absorbed then flows under the application gas pressure from top to bottom, is set and changes in vertical array tubular
After the gas-liquid separator of hot device bottom, absorbing liquid is exported from absorbing liquid to flow out, and gas to be absorbed then absorbs gas outlet outflow from band.
In connection relationship, the absorbing liquid outlet of the first absorptive unit is connect with the absorbing liquid entrance of the second absorptive unit, according to
Secondary to analogize, the absorbing liquid outlet of N-1 absorptive unit is connect with the absorbing liquid entrance of N absorptive unit, to guarantee absorbing liquid
According to the first absorptive unit, the second absorptive unit ..., the sequential flowing of N absorptive unit.And it is inhaled in short transverse, first
The absorbing liquid outlet port for receiving unit is higher than the absorbing liquid entry position ... ... of the second absorptive unit, the suction of N-1 absorptive unit
Receive the absorbing liquid entry position that liquid outlet port is higher than N absorptive unit, it is ensured that absorbing liquid is in each absorptive unit
The smoothness of circulation.
Second aspect, the present invention provides a kind of gas absorbing devices, comprising:
N number of absorptive unit, wherein
Absorbing liquid successively pass through the first absorptive unit ..., N absorptive unit, gas to be absorbed successively pass through N absorb it is single
Member ..., the first absorptive unit, in each absorptive unit, absorbing liquid flows downward with gas cocurrent to be absorbed；N be greater than etc.
In 2 natural number.For example, the value of N can natural number between 3-6.
Gas absorbing device provided by the invention innovatively organically combines gas-liquid co-flow and gas-liquid reverse flow
Together, it in the vertical heat exchanging pipe simple relative to tradition for gas-liquid counter current absorption equipment, solves its easily generation liquid flooding and leads
The problem of causing blocking；For the downward absorption equipment of gas and liquid flowing in traditional vertical heat exchanging pipe, solves its absorption
Number of theoretical plate is low, the problem of assimilation effect difference.Gas and liquid flowing can be provided simultaneously with using gas absorbing device provided by the invention
The double effects absorbed upwards with gas and liquid flowing are absorbed downwards, and then improve the efficiency and effect of gas absorption.
In certain embodiments of the present invention, it is successively in that step arrangement connects that gas absorbing device, which includes: in short transverse,
The first absorptive unit for connecing ..., N absorptive unit, wherein the level height of the first absorptive unit is higher than N absorptive unit
Level height.
First absorptive unit ..., N absorptive unit short transverse be successively in step arrangement connection refer to, first inhale
Receive unit ..., N absorptive unit be located at different height and positions, height and position is from the first absorptive unit to N absorptive unit
Successively reduce.Wherein, the absorbing liquid outlet of the first absorptive unit is connect with the absorbing liquid entrance of the second absorptive unit, successively class
It pushes away, the absorbing liquid outlet of N-1 absorptive unit is connect with the absorbing liquid entrance of N absorptive unit.In this way, absorbing liquid is inhaled from first
It receives unit to start, the gravity that can use itself flows downward, and can gradually flow to N from the first absorptive unit and absorb list
Member.
The setting structure can guarantee that the absorbing liquid in vertical array tubular heat exchanger flows from top to bottom under the effect of gravity, and
Gas to be absorbed then flows under the application gas pressure from top to bottom, realizes that cocurrent of the gas-liquid in absorptive unit moves downward.
In certain embodiments of the present invention, each absorptive unit includes vertical array tubular heat exchanger, and vertical array tubular changes
The bottom of tube side is equipped with gas-liquid separator in hot device.Gas-liquid separator for example can be vortex gas-liquid separator or decanter type gas
Liquid/gas separator or deflector type gas-liquid separator.
Using vertical array tubular heat exchanger, absorbing liquid and gas to be absorbed flow in the tube side of heat exchanger, and in heat exchanger
It can be passed through the media such as heat-conducting medium, such as recirculated water in shell side to take away heat, cooling processing is carried out to absorbing liquid, to reduce
The decline of absorption efficiency caused by temperature rise.Absorbing liquid in vertical array tubular heat exchanger flows from top to bottom under the effect of gravity, and
Gas to be absorbed then also flows under the application gas pressure from top to bottom, is set the gas-liquid point in vertical array tubular exchanger base
After device, absorbing liquid is exported from absorbing liquid to flow out, and gas to be absorbed then absorbs gas outlet outflow from band.
In a further embodiment of the invention, be respectively set at the top of vertical array tubular heat exchanger absorbing liquid entrance and to
Gas entrance is absorbed, absorbing liquid outlet and gas to be absorbed outlet is respectively set in each absorptive unit lower part；
The level of level height >=second absorptive unit absorbing liquid entrance of the absorbing liquid outlet of first absorptive unit is high
Degree, and so on, the level of level height >=N absorptive unit absorbing liquid entrance of the absorbing liquid outlet of the second absorptive unit
Highly.
In short transverse, the absorbing liquid outlet port of the first absorptive unit is higher than the absorbing liquid entrance position of the second absorptive unit
It sets ... ..., the absorbing liquid outlet port of N-1 absorptive unit is higher than the absorbing liquid entry position of N absorptive unit, it is ensured that
The smoothness of circulation of the absorbing liquid in each absorptive unit.
When connection, according to absorbing liquid followed by the first absorptive unit, second between absorbing liquid entrance and absorbing liquid outlet
The sequential connection of absorptive unit and third absorptive unit；For example, absorbing liquid outlet and the second absorptive unit of the first absorptive unit
The connection of absorbing liquid entrance, and so on, the absorbing liquid entrance of the absorbing liquid of N-1 absorptive unit outlet and N absorptive unit
Connection.
Meanwhile gas entrance to be absorbed and gas to be absorbed outlet between according to gas to be absorbed followed by third absorptive unit,
The sequential connection of second absorptive unit and the first absorptive unit；For example, the gas to be absorbed outlet of N absorptive unit is inhaled with N-1
The gas entrance to be absorbed connection of unit is received, and so on, gas to be absorbed outlet and the first absorptive unit of the second absorptive unit
Gas entrance connection to be absorbed.
Embodiment 1
The present embodiment is a kind of gas absorbing device, including 3 absorptive units, respectively the first absorptive unit 10, second
Absorptive unit 20 and third absorptive unit 30.The process flow for handling gas to be absorbed using the gas absorbing device is as shown in Figure 1.
In figure, solid arrow direction is the flow direction of absorbing liquid, and dotted arrow direction is the flow direction of gas to be absorbed.
Each absorptive unit includes a vertical array tubular heat exchanger, and the top of each vertical array tubular heat exchanger is equipped with one
Absorbing liquid entrance and a gas entrance to be absorbed, and the bottom of each vertical array tubular heat exchanger is equipped with an absorbing liquid outlet,
Side wall near the bottom of each vertical array tubular heat exchanger is equipped with a gas outlet to be absorbed.Each vertical array tubular heat exchanger bottom
A vortex gas-liquid separator is additionally provided in portion space.
The absorbing liquid outlet of first absorptive unit is connect with the absorbing liquid entrance of the second absorptive unit, the second absorptive unit
Absorbing liquid outlet is connect with the absorbing liquid entrance of third absorptive unit.And first absorptive unit absorbing liquid outlet position it is high
Degree is higher than the position height of the absorbing liquid entrance of the second absorptive unit, and the position height of the absorbing liquid outlet of the second absorptive unit is high
In the position height of the absorbing liquid entrance of third absorptive unit.Absorbing liquid is injected from the absorbing liquid entrance of first unit, is then existed
Followed by the first absorptive unit, the second absorptive unit and third absorptive unit under the action of self gravity, finally inhaled from third
The absorbing liquid for receiving unit exports outflow.
The gas to be absorbed outlet of third absorptive unit is connect with the gas entrance to be absorbed of the second absorptive unit, and second absorbs list
The gas to be absorbed outlet of member is connect with the gas entrance to be absorbed of the first absorptive unit.Gas to be absorbed is from third absorptive unit wait inhale
Getter entrance flows into, and then under the action of gas to be absorbed gas pressure itself, absorbs followed by third absorptive unit, second
Unit and the first absorptive unit.
Comparative example 1
This comparative example is a kind of gas absorbing device, which is that a single vertical gas and liquid flowing flows downward
Absorption plant, specifically, the structure phase of gas absorbing device and an absorptive unit in embodiment 1 in this comparative example
Together.The process flow for handling gas to be absorbed using the gas absorbing device is as shown in Figure 2.In figure, solid arrow direction is to absorb
The flow direction of liquid, dotted arrow direction are the flow direction of gas to be absorbed.
Comparative example 2
As shown in figure 3, this comparative example is a kind of gas absorbing device, which is packed absorber.Processing
When gas to be absorbed, gas to be absorbed is passed through from the bottom of packed tower, and is flowed from top to bottom, and absorbing liquid is then from the top of packed tower
It is passed through, and flows from top to bottom.The process flow for handling gas to be absorbed using the gas absorbing device is as shown in Figure 3.It is real in figure
Line arrow direction is the flow direction of absorbing liquid, and dotted arrow direction is the flow direction of gas to be absorbed.
The gas absorbing device for being utilized respectively embodiment 1 and comparative example 1-2 offer handles identical gas to be absorbed.It tested
The ingredient of Cheng Zhong, absorbing liquid used are identical, and the ingredient of gas to be absorbed used is also identical.Specific liquid absorption element,
Gas ingredient, treatment process and processing result to be absorbed are listed in table 1.
Table 1
As can be seen from Table 1, after handling the gas to be absorbed of identical ammonia content, in the absorbing liquid that embodiment 1 obtains
Ammonia density highest, while ammonia content is minimum in residual gas after absorption, assimilation effect is clearly.Due to initial to be absorbed
The content of ammonia in gas is 96%, and after the completion of absorption, the content of the ammonia in residual gas in embodiment 1 is reduced to 80.6%,
The content of ammonia reduces 15.4%, and the content of the ammonia in the residual gas in comparative example 1 is reduced to 92.5%, and the content of ammonia is reduced
3.5%, from the reduction amount of embodiment 1 and comparative example 1 as can be seen that suction in uptake > comparative example 1 in embodiment 1
Receipts amount, therefore, effect of the invention are not the assimilation effect that simple three single vertical gas and liquid flowings move heat absorption device
Superposition.Meanwhile the assimilation effect of embodiment 1 will be significantly larger than the assimilation effect of the packed tower in comparative example 2.
Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention., rather than its limitations；To the greatest extent
Pipe present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that: its according to
So be possible to modify the technical solutions described in the foregoing embodiments, or to some or all of the technical features into
Row equivalent replacement；And these are modified or replaceed, various embodiments of the present invention technology that it does not separate the essence of the corresponding technical solution
The range of scheme.
Claims (10)
1. a kind of gas absorption process, which comprises the following steps:
Absorbing liquid successively pass through the first absorptive unit ..., N absorptive unit, gas to be absorbed successively pass through N absorb it is single
Member ..., the first absorptive unit, in each absorptive unit, the absorbing liquid flows downward with the gas cocurrent to be absorbed；Its
In, N is the natural number more than or equal to 2.
2. gas absorption process according to claim 1, which is characterized in that the natural number between N value 3-6.
3. gas absorption process according to claim 1 or 2, which is characterized in that the absorbing liquid under Gravitative Loads according to
Secondary process first absorptive unit ... and the N absorptive unit.
4. gas absorption process according to claim 3, which is characterized in that first absorptive unit ..., to described
N absorptive unit is connected in a manner of step arrangement in short transverse, wherein the level height of first absorptive unit is higher than institute
State the level height of N absorptive unit.
5. gas absorption process according to claim 3, which is characterized in that first absorptive unit ..., described
N absorptive unit, each absorptive unit include a vertical array tubular heat exchanger.
6. gas absorption process according to claim 4, which is characterized in that distinguish on the top of the vertical array tubular heat exchanger
Absorbing liquid entrance and gas entrance to be absorbed are set, and the lower part of the vertical array tubular heat exchanger is respectively set absorbing liquid outlet and wait inhale
Getter exports, and the bottom of tube side is equipped with gas-liquid separator in the vertical array tubular heat exchanger；Wherein,
The level of level height >=second absorptive unit absorbing liquid entrance of the absorbing liquid outlet of first absorptive unit is high
Degree,
And so on,
The level of level height >=N absorptive unit absorbing liquid entrance of the absorbing liquid outlet of the N-1 absorptive unit is high
Degree.
7. a kind of gas absorbing device characterized by comprising
N number of absorptive unit, wherein
Absorbing liquid successively pass through the first absorptive unit ..., N absorptive unit, gas to be absorbed successively pass through N absorb it is single
Member ..., the first absorptive unit, in each absorptive unit, the absorbing liquid flows downward with the gas cocurrent to be absorbed；N
For the natural number more than or equal to 2.
8. gas absorbing device according to claim 7 characterized by comprising short transverse be successively in ladder row
Cloth connection first absorptive unit ..., the N absorptive unit wherein, the level height of first absorptive unit
Higher than the level height of the N absorptive unit.
9. gas absorbing device according to claim 8, which is characterized in that each absorptive unit includes a vertical array tubular
Heat exchanger, the bottom of tube side is equipped with gas-liquid separator in the vertical array tubular heat exchanger；
Preferably, absorbing liquid entrance and gas entrance to be absorbed, each absorption is respectively set in the top of the vertical array tubular heat exchanger
Absorbing liquid outlet and gas to be absorbed outlet is respectively set in unit lower part；
The level height of level height >=second absorptive unit absorbing liquid entrance of the absorbing liquid outlet of first absorptive unit, according to
Secondary to analogize, the level of level height >=N absorptive unit absorbing liquid entrance of the absorbing liquid outlet of N-1 absorptive unit is high
Degree.
10. purposes of the described in any item gas absorbing devices of claim 7-9 in gas purification processing.
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