CN112546673A - Parallel uniform-feeding resin column system and feeding control method - Google Patents
Parallel uniform-feeding resin column system and feeding control method Download PDFInfo
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- 239000011347 resin Substances 0.000 title claims abstract description 142
- 229920005989 resin Polymers 0.000 title claims abstract description 142
- 238000000034 method Methods 0.000 title claims abstract description 20
- 230000001105 regulatory effect Effects 0.000 claims abstract description 31
- 239000007788 liquid Substances 0.000 claims description 19
- 239000000463 material Substances 0.000 claims description 18
- 238000005342 ion exchange Methods 0.000 claims description 17
- 238000001514 detection method Methods 0.000 claims description 7
- 230000008569 process Effects 0.000 claims description 6
- 238000004587 chromatography analysis Methods 0.000 claims description 3
- 238000007599 discharging Methods 0.000 claims description 3
- 239000003513 alkali Substances 0.000 claims description 2
- 239000002253 acid Substances 0.000 claims 1
- 238000004519 manufacturing process Methods 0.000 abstract description 24
- 229920002472 Starch Polymers 0.000 abstract description 2
- 239000003814 drug Substances 0.000 abstract description 2
- 238000000855 fermentation Methods 0.000 abstract description 2
- 230000004151 fermentation Effects 0.000 abstract description 2
- 235000013305 food Nutrition 0.000 abstract description 2
- 235000019698 starch Nutrition 0.000 abstract description 2
- 239000008107 starch Substances 0.000 abstract description 2
- 238000007670 refining Methods 0.000 description 17
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 9
- 229930091371 Fructose Natural products 0.000 description 6
- RFSUNEUAIZKAJO-ARQDHWQXSA-N Fructose Chemical compound OC[C@H]1O[C@](O)(CO)[C@@H](O)[C@@H]1O RFSUNEUAIZKAJO-ARQDHWQXSA-N 0.000 description 6
- 239000005715 Fructose Substances 0.000 description 6
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 6
- 238000000746 purification Methods 0.000 description 6
- 238000013375 chromatographic separation Methods 0.000 description 3
- 239000002585 base Substances 0.000 description 2
- 230000001276 controlling effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 238000001179 sorption measurement Methods 0.000 description 2
- OWEGMIWEEQEYGQ-UHFFFAOYSA-N 100676-05-9 Natural products OC1C(O)C(O)C(CO)OC1OCC1C(O)C(O)C(O)C(OC2C(OC(O)C(O)C2O)CO)O1 OWEGMIWEEQEYGQ-UHFFFAOYSA-N 0.000 description 1
- GUBGYTABKSRVRQ-PICCSMPSSA-N Maltose Natural products O[C@@H]1[C@@H](O)[C@H](O)[C@@H](CO)O[C@@H]1O[C@@H]1[C@@H](CO)OC(O)[C@H](O)[C@H]1O GUBGYTABKSRVRQ-PICCSMPSSA-N 0.000 description 1
- 238000011001 backwashing Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000010612 desalination reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 239000003456 ion exchange resin Substances 0.000 description 1
- 229920003303 ion-exchange polymer Polymers 0.000 description 1
- 238000002386 leaching Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000012492 regenerant Substances 0.000 description 1
- 230000008929 regeneration Effects 0.000 description 1
- 238000011069 regeneration method Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D15/00—Separating processes involving the treatment of liquids with solid sorbents; Apparatus therefor
- B01D15/08—Selective adsorption, e.g. chromatography
- B01D15/10—Selective adsorption, e.g. chromatography characterised by constructional or operational features
- B01D15/14—Selective adsorption, e.g. chromatography characterised by constructional or operational features relating to the introduction of the feed to the apparatus
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D15/00—Separating processes involving the treatment of liquids with solid sorbents; Apparatus therefor
- B01D15/08—Selective adsorption, e.g. chromatography
- B01D15/10—Selective adsorption, e.g. chromatography characterised by constructional or operational features
- B01D15/16—Selective adsorption, e.g. chromatography characterised by constructional or operational features relating to the conditioning of the fluid carrier
- B01D15/163—Pressure or speed conditioning
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D15/00—Separating processes involving the treatment of liquids with solid sorbents; Apparatus therefor
- B01D15/08—Selective adsorption, e.g. chromatography
- B01D15/10—Selective adsorption, e.g. chromatography characterised by constructional or operational features
- B01D15/18—Selective adsorption, e.g. chromatography characterised by constructional or operational features relating to flow patterns
- B01D15/1864—Selective adsorption, e.g. chromatography characterised by constructional or operational features relating to flow patterns using two or more columns
- B01D15/1885—Selective adsorption, e.g. chromatography characterised by constructional or operational features relating to flow patterns using two or more columns placed in parallel
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- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Treatment Of Liquids With Adsorbents In General (AREA)
- Treatment Of Water By Ion Exchange (AREA)
Abstract
The invention discloses a parallel uniform-feeding resin column system and a feeding control method, and belongs to the field of starch sugar, biological fermentation and food and medicine production equipment. The resin column system comprises a plurality of resin columns connected in parallel, and the inlet of each resin column is provided with a flowmeter and a regulating valve; the inlet flow meter and the regulating valve of each resin column form a flow control ring under a set program, and the flow entering the resin columns can be automatically regulated according to the set flow. The invention ensures that the feeding flow of each resin column can be coordinately controlled, so that the feeding flow of each column is uniform. The phenomenon that the feeding flow of each column is uneven due to different column internal resistance and column external pressure in the traditional feeding mode is avoided.
Description
Technical Field
The invention discloses a parallel uniform-feeding resin column system and a feeding control method, and belongs to the fields of starch sugar, biological fermentation, food and medicine production equipment and the like.
Background
At present, a continuous ion exchange and continuous chromatographic separation system uses a connection mode that a plurality of resin columns are connected in parallel to enter and exit. The material or water is directly distributed to a plurality of resin columns by a main pipe and then is collected to a pipeline from the plurality of resin columns. Ideally, the liquid in the main conduit should be evenly distributed to the resin columns connected in parallel.
Ideally, ion exchange can fully exert the exchange adsorption capacity of all the resins.
Ideally, chromatographic separation zones can be distributed orderly, and materials with different components can be separated better.
However, the conventional parallel feeding method has many disadvantages in the operation process for the following reasons.
(1) In continuous ion exchange, resin columns can be switched in different procedures, and the position difference of each resin column is different, so that the resistance of each column fed in parallel in the same procedure is different;
(2) the resin column has different degrees of resin crushing and pollution, so that the saturation degrees are different, and the resistance of the resin layers of the columns is different;
(3) because of the proximity, there is always a difference in pressure from the feed manifold to each resin column, and such a difference does not change regularly as the flow rate of the manifold changes.
The fluid is fed in parallel, the position is high, the resistance of the resin column which is close to complete saturation is large, the feed flow is small, the resin can not carry out sufficient ion exchange, the position is low, the resistance of the newly treated resin column is small, the feed flow is large, the treatment pressure is large, the load of equipment is increased, and the consumption of the regenerant and water is increased. The above reasons cause uneven distribution of the feeding flow of each column in the traditional parallel connection mode, and influence the ion exchange and component separation effects of the resin on the materials.
Disclosure of Invention
The invention mainly solves the technical problem of providing a resin column system with parallel and uniform feeding and a feeding control method, so as to ensure that the exchange adsorption capacity of all ion exchange resins is exerted, the ordered distribution of a chromatographic separation area is ensured, and materials are fully separated.
The invention provides a parallel uniform feeding resin column system, which comprises a plurality of resin columns connected in parallel, wherein the inlet of each resin column is provided with a flowmeter and an adjusting valve; the inlet flow meter and the regulating valve of each resin column form a flow control ring under a set program, and the flow entering the resin columns can be automatically regulated according to the set flow.
The flowmeter measures the instantaneous flow of the liquid passing through, and the regulating valve regulates the opening according to the flow data measured by the flowmeter and the deviation of the set flow, so that the flow entering the resin column conforms to the set flow.
The parallel resin column system with uniform feeding is used for a continuous ion exchange system or a continuous chromatographic system.
The resin columns connected in parallel are arranged in the order of saturation, and when the resin column with the highest saturation reaches the maximum saturation, the resin columns are switched. When the index detection value of the discharged liquid of the resin column is higher than a set value or the total feed flow of the resin column reaches a preset value, the resin column reaches the maximum saturation degree. The detection indicators of the discharged liquid are generally the pH and conductivity of the discharged liquid.
The flowmeter is an acid-alkali-resistant vortex shedding flowmeter and can measure the flow of low-conductivity liquid.
A feeding control method for parallel connection uniform feeding resin column system includes measuring instantaneous flow rate by flow meter at inlet of each resin column, regulating opening degree by regulating valve according to flow rate data measured by flow meter and deviation of set flow rate to let material enter each resin column according to set flow rate.
When the total flow of feed Fs totalWhen the flow meter of each resin column measures the instantaneous flow of the liquid passing through, the regulating valve of each resin column regulates the opening according to the flow data measured by the flow meter and the deviation of the set flow, and the flow entering the resin column is controlled to be
Wherein, Fs totalFor the total flow of feed, Fs is divided intoN is the number of parallel resin columns for a set flow rate into a single resin column.
When the total flow is uncertain or the total flow cannot be directly set for control due to process requirements, the flow meter at the inlet of each resin column measures the passing instantaneous flow which is sequentially Fp1, Fp2, Fp3 … … and Fpn, and the instantaneous flow is automatically added to obtain a total flow Fp total, so that the total flow is controlled to be FsTotal ═ FpTotal ", the regulating valve regulates the opening degree according to the flow data measured by the flow meter and the deviation of the set flow, and controls the flow entering each resin column to be
Wherein, Fs totalFor the total flow of feed, Fs is divided intoN is the number of parallel resin columns for a set flow rate into a single resin column.
The invention ensures that the feeding flow of each resin column can be coordinately controlled, so that the feeding flow of each column is uniform. The phenomenon that the feeding flow of each column is uneven due to different column internal resistance and column external pressure in the traditional feeding mode is avoided.
Drawings
FIG. 1 is a schematic diagram of a parallel uniformly fed resin column system;
FIG. 2 is a schematic diagram of a 5-column parallel uniformly fed resin column system;
FIG. 3 is a schematic flow chart of the present invention for controlling the flow rate into each resin column when total flow is uncertain.
Detailed Description
The technical solution of the present invention will be explained in detail below.
Through the programming, guarantee that each resin column feed flow can coordinated control.
As shown in fig. 1, the parallel uniform feed resin column system includes a plurality of resin columns 100 arranged in parallel, each of which is provided at an inlet thereof with a flow meter 200 and a regulating valve 300. Through the programming, the flowmeter that sets up at single resin column import measures instantaneous flow, can calculate the total flow through all parallelly connected feeding resin columns simultaneously, regards it as the control foundation of the parallelly connected feeding of entire system, has avoided traditional feeding mode because of resistance in the post and the different pressure outside the post, the inhomogeneous phenomenon of each post feeding flow that leads to.
The feeding control method specifically adopts the following technical measures:
the inlet of each resin column is provided with a flow meter and a regulating valve to form a single flow control ring, the flow meter can measure the instantaneous flow of the liquid passing through, and the regulating valve regulates the opening according to the deviation of the flow data measured by the flow meter and the set flow value, so that the flow can be controlled to be as close to the set flow as possible.
When the total flow of feed Fs totalWhen the determination is made, the flow meter of each resin column measures the instantaneous flow rate of the liquid passing through, the regulating valve of each resin column regulates the opening according to the flow rate data measured by the flow meter and the deviation of the set flow rate value, and the flow rate entering the resin column is controlled to be
Wherein, Fs totalFor the total flow of feed, Fs is divided intoN is the number of parallel resin columns for a set flow rate into a single resin column.
When the total flow is uncertain, if no flow meter is arranged on a feeding main pipe, or the total flow can not be directly set for control due to process requirements, the instantaneous flow measured by the flow meter at the inlet of each resin column is Fp1, Fp2, Fp3 … … and Fpn in sequence, the instantaneous flow is automatically added to obtain a total flow Fp total, the total flow Fs is made to be the total Fp by program control, the opening degree is adjusted by an adjusting valve according to the flow data measured by the flow meter and the deviation of the set flow value, and the flow entering each resin column is controlled to be the total flow
As shown in figure 3 of the drawings.
Example 1, ion exchange system.
The whole continuous ion exchange system comprises a plurality of functional units, such as sugar top water, refining, production, backwashing, regeneration, leaching and other units. In order to ensure the balanced feeding process of the production unit and the refining unit, the inlet of each resin column is provided with a flow meter and a regulating valve to form an independent flow control ring, the flow meter can measure the instantaneous flow of the liquid passing through, and the regulating valve regulates the opening according to the flow data measured by the flow meter and the deviation of the set flow value, so that the flow can be controlled to be as close to the set flow value as possible.
As shown in fig. 2, the production unit is the first ion exchange dedust unit. Taking continuous ion exchange of 5-column feeding as an example, the functional small unit where the resin column is positioned is named asProduction 1, production 2, production 3, production 4, and production 5. When the production feed flow is set to be 20m3The DCS control system realizes PID control through a resin column inlet regulating valve and a feed flowmeter, and regulates the resin column feed flow of each production process to be 4m3H is used as the reference value. Meanwhile, the resin columns are arranged in sequence according to the saturation degree, wherein the production 1 is that the saturation degree of each resin column in the production unit is the highest, and the like, the production 5 is the lowest, the DCS control system controls the switching of the resin columns by measuring whether the index detection value of the discharging liquid of the production 1 is higher than a set value or whether the feeding total amount of the production 1 reaches the set value, when the discharging detection value of the production 1 is higher than the set value or the feeding total amount of the production 1 reaches the set value, the resin columns of the production 5 are switched to the production 4, and the like, the production 2 is switched to the production 1, and the production 1 is switched to the next functional unit.
The refining unit is a unit for removing impurities by ion exchange for the second time. This portion of the feed has been subjected to ion exchange stripping by flowing through the production unit. Similarly, taking continuous ion exchange of 5-column purification as an example, the functional units of the ion exchange column are named as purification 1, purification 2, purification 3, purification 4 and purification 5. When setting the refining feed flow at 20m3The DCS control system realizes PID control through the inlet adjusting valve of the resin column and the feed flowmeter, and adjusts the feed flow of the refining column to 4m3H is used as the reference value. Meanwhile, the resin columns are arranged in sequence according to the saturation degree, wherein the refining 1 is the column with the highest saturation degree in each resin column in the refining unit, and the like, the refining 5 is the resin column with the lowest saturation degree and is fresh, the DCS control system controls the switching of the resin columns by measuring whether the index detection value of the discharged liquid of the refining 1 is higher than a set value or whether the total feeding amount of the refining 1 reaches the set value, when the discharge detection value of the refining 1 is higher than the set value or the total feeding amount of the refining 1 reaches the set value, the resin column of the refining 5 is switched to the refining 4, and the like, the refining 2 is switched to the refining 1, and the refining 1 is switched to another functional unit.
When the total flow of feed Fs totalWhen determined, the flow meter of each resin column measures the instantaneous flow rate of the liquid passing through, and the regulating valve of each resin column measures the flow rate according to the flow rate measured by the flow meterThe deviation of the data and the set flow value regulates the opening, and the flow entering the resin column is controlled to be
Wherein, Fs totalFor the total flow of feed, Fs is divided into5 is the number of parallel resin columns for the set flow rate into a single resin column.
When the total flow is uncertain or the total flow cannot be directly set for control due to process requirements, the flow meter at the inlet of each resin column measures the passing instantaneous flow which is Fp1, Fp2, Fp3 … … and Fp5 in sequence, the instantaneous flow is automatically added to obtain a total flow ' Fp total ', the ' Fs total ' is made to be the Fp total ' through program control, the opening degree is adjusted by the adjusting valve according to the flow data measured by the flow meter and the deviation of the set flow value, and the flow entering each resin column is controlled to be
Example 2, chromatography system, total 20 columns, 4 columns in parallel feed.
The inlet of each resin column is provided with a flow meter and a regulating valve to form an independent flow control loop for controlling the flow, the flow meter can measure the instantaneous flow of the liquid passing through, and the regulating valve regulates the opening according to the flow data measured by the flow meter and the deviation of the set flow value, so that the flow can be controlled to be as close to the set value as possible.
When the total flow of feed Fs totalWhen the determination is made, the flow meter of each resin column measures the instantaneous flow rate of the liquid passing through, the regulating valve of each resin column regulates the opening according to the flow rate data measured by the flow meter and the deviation of the set flow rate value, and the flow rate entering the resin column is controlled to be
Wherein, Fs totalFor the total flow of feed, Fs is divided into4 is the number of parallel resin columns for the set flow rate into a single resin column.
When the total flow is uncertain, or the total flow cannot be directly set for the processDuring control, the flow meter at the inlet of each resin column measures the passing instantaneous flow, which is Fp1, Fp2, Fp3 and Fp4 in sequence, the instantaneous flow is automatically added to obtain a total flow, the total flow is Fp total, the total flow is controlled by a program to make the total flow Fs total Fp total, an adjusting valve adjusts the opening according to the flow data measured by the flow meter and the deviation of a set flow value, and the flow entering each resin column is controlled to be Fp total
The resin column switching of example 2 is the same as that of example 1, and is not described again.
Example 3, ion exchange system, used mainly for maltose desalination; the feed conductivity is required to be about 500. mu.s/cm and the discharge conductivity less than 20. mu.s/cm. The system comprises 20 columns, 5 columns are connected in parallel for feeding, and before a regulating valve and a flowmeter which are required by parallel and uniform feeding are installed, the volume of materials treated by resin is 73.3 times of the volume of the resin, the amount of 30% HCL required by each cubic meter of the materials is 1.83 kg, the amount of 30% NaOH required by each cubic meter of the materials is 2.33 kg, and the water amount required by each cubic meter of the materials is 0.238 ton; after installation, the volume of the resin-treated material was 110.5 times the volume of the resin, and the amount of 30% HCl required per cubic meter of material was 1.42 kg, the amount of 30% NaOH required was 1.65 kg, and the amount of water required was 0.1688 ton. After the flow meter and the regulating valve are used, the materials uniformly enter the resin column, so that the resin treatment capacity is improved, the chemical consumption is reduced, and the water consumption is greatly saved.
Example 4, chromatographic system, mainly for the separation of fructose; the feed fructose content is required to be 42 percent, and the fructose content of the extracting solution is required to be more than 90 percent. The system comprises 20 columns, 3 columns are connected in parallel for feeding, 55.1 kilograms of dry base materials are treated per cubic meter of resin per hour before a regulating valve and a flowmeter which are required by parallel and uniform feeding are arranged, the yield of fructose is 78.2 percent, and the volume ratio of the washing water to the treated materials in the whole system is 1.27; after installation, 69.3 kg of dry base material per cubic meter of resin per hour was treated, the fructose yield was 92.4%, and the volume ratio of the total system wash water to the treated material was 1.08. The use of the flow meter and the regulating valve in the chromatographic system enables materials to uniformly enter the resin column, improves the resin treatment capacity and the fructose yield, and greatly saves the water consumption.
The application of the technology can fully exert the technical advantages of continuous ion exchange and continuous chromatography, promote the technical progress of the industry and bring the advantages of energy conservation and consumption reduction for users.
The above description is only an example of the present invention, and is not intended to limit the scope of the present invention. Although the invention has been described in detail above with reference to a general description and specific embodiments, it will be apparent to those skilled in the art that modifications or improvements may be made on the basis of the invention. Accordingly, such modifications and improvements are intended to be within the scope of this invention as claimed and claimed.
Claims (10)
1. A resin column system with parallel and uniform feeding comprises a plurality of resin columns connected in parallel, and is characterized in that a flow meter and a regulating valve are arranged at the inlet of each resin column; the inlet flow meter and the regulating valve of each resin column form a flow control ring under a set program, and the flow entering the resin columns can be automatically regulated according to the set flow.
2. The parallel uniform feeding resin column system as claimed in claim 1, wherein the flow meter measures the instantaneous flow rate of the liquid passing through, and the regulating valve regulates the opening degree according to the flow rate data measured by the flow meter and the deviation of the set flow rate, so that the flow rate entering the resin column conforms to the set flow rate.
3. The parallel uniform feed resin column system of claim 1, wherein the parallel uniform feed resin column system is used in a continuous ion exchange system or a continuous chromatography system.
4. The parallel uniform feed resin column system of claim 1, wherein the resin columns connected in parallel are arranged in order of saturation, and the resin column switching is performed when the resin column with the highest saturation reaches the maximum saturation.
5. The parallel uniform feeding resin column system of claim 4, wherein the resin column reaches a maximum saturation degree when an index detection value of the discharging liquid of the resin column is higher than a set value or a total feeding flow rate of the resin column reaches a preset value.
6. The parallel uniform feed resin column system of claim 1, wherein said flow meter is an acid and alkali resistant vortex shedding flow meter capable of measuring the flow of low conductivity liquids.
7. A feeding control method of a resin column system with parallel and uniform feeding is characterized in that a flowmeter arranged at an inlet of each resin column measures the passing instantaneous flow, and an adjusting valve adjusts the opening according to the flow data measured by the flowmeter and the deviation of the set flow through program control, so that materials enter each resin column according to the set flow.
8. The method of claim 7, wherein the total flow rate F is set ass totalWhen the flow meter of each resin column measures the instantaneous flow of the liquid passing through, the regulating valve of each resin column regulates the opening according to the flow data measured by the flow meter and the deviation of the set flow, and the flow entering the resin column is controlled to be
Wherein, Fs totalFor the total flow of feed, Fs is divided intoN is the number of parallel resin columns for a set flow rate into a single resin column.
9. The method of claim 7, wherein when the total flow rate is uncertain or cannot be directly set for control due to process requirements, the flow meter at the inlet of each resin column measures the instantaneous flow rate passing through, which is Fp1, Fp2, Fp3 … … in sequenceFpn, automatically sum to get a total flow "Fpsotal", let "FsTotal ═ FpTotal ", the regulating valve regulates the opening degree according to the flow data measured by the flow meter and the deviation of the set flow, and controls the flow entering each resin column to be
Wherein, Fs totalFor the total flow of feed, Fs is divided intoN is the number of parallel resin columns for a set flow rate into a single resin column.
10. The feed control method of the parallel uniform-feed resin column system according to claim 7, wherein the resin columns connected in parallel are arranged in order of saturation, and when the resin column with the highest saturation reaches a preset value of saturation, the resin column switching is performed.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114275814A (en) * | 2021-10-08 | 2022-04-05 | 欧尚元(天津)有限公司 | Vanadium pentoxide extraction method and extraction system |
| CN115487541A (en) * | 2022-10-20 | 2022-12-20 | 中核第四研究设计工程有限公司 | Large-diameter compact fixed bed adsorption tower and flow field regulation and control method thereof |
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