CN211936263U - Three-tower absorption and desorption experimental device - Google Patents
Three-tower absorption and desorption experimental device Download PDFInfo
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- CN211936263U CN211936263U CN202020354501.0U CN202020354501U CN211936263U CN 211936263 U CN211936263 U CN 211936263U CN 202020354501 U CN202020354501 U CN 202020354501U CN 211936263 U CN211936263 U CN 211936263U
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- 238000010521 absorption reaction Methods 0.000 title claims abstract description 149
- 238000003795 desorption Methods 0.000 title claims abstract description 130
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 95
- 239000007788 liquid Substances 0.000 claims abstract description 79
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 62
- 239000001301 oxygen Substances 0.000 claims abstract description 37
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 37
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 35
- 229910052757 nitrogen Inorganic materials 0.000 claims description 31
- 239000000243 solution Substances 0.000 claims description 23
- 239000007789 gas Substances 0.000 claims description 16
- 230000001105 regulatory effect Effects 0.000 claims description 15
- 229920006395 saturated elastomer Polymers 0.000 claims description 14
- 238000005070 sampling Methods 0.000 claims description 13
- 239000008367 deionised water Substances 0.000 claims description 11
- 229910021641 deionized water Inorganic materials 0.000 claims description 11
- 230000002745 absorbent Effects 0.000 claims description 8
- 239000002250 absorbent Substances 0.000 claims description 8
- 239000007864 aqueous solution Substances 0.000 claims description 5
- 238000002474 experimental method Methods 0.000 abstract description 24
- 239000000126 substance Substances 0.000 abstract description 2
- 230000015572 biosynthetic process Effects 0.000 abstract 2
- 229910001873 dinitrogen Inorganic materials 0.000 abstract 1
- 238000000034 method Methods 0.000 description 13
- 239000000945 filler Substances 0.000 description 12
- 229910000831 Steel Inorganic materials 0.000 description 9
- 239000010959 steel Substances 0.000 description 9
- 239000012528 membrane Substances 0.000 description 8
- 229910001220 stainless steel Inorganic materials 0.000 description 6
- 239000010935 stainless steel Substances 0.000 description 6
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 4
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 4
- 239000003792 electrolyte Substances 0.000 description 4
- 238000005259 measurement Methods 0.000 description 4
- 239000007791 liquid phase Substances 0.000 description 3
- 238000012856 packing Methods 0.000 description 3
- 230000000087 stabilizing effect Effects 0.000 description 3
- 238000012546 transfer Methods 0.000 description 3
- 229910021529 ammonia Inorganic materials 0.000 description 2
- 238000003490 calendering Methods 0.000 description 2
- 229910002092 carbon dioxide Inorganic materials 0.000 description 2
- 239000001569 carbon dioxide Substances 0.000 description 2
- 230000002950 deficient Effects 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 238000010926 purge Methods 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 239000011324 bead Substances 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000009533 lab test Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 239000008399 tap water Substances 0.000 description 1
- 235000020679 tap water Nutrition 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
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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
-
- 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
-
- 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
- B01D53/1412—Controlling the absorption process
-
- 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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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Treating Waste Gases (AREA)
- Gas Separation By Absorption (AREA)
Abstract
The utility model belongs to the technical field of the chemical industry experiment, specifically disclose a three tower absorption and desorption experimental apparatus, including saturation tower, desorber and absorption tower, still include a plurality of pipeline valves, flowmeter, high-pressure pump and temperature sensor, earlier with the oxygen formation oxygen saturation water back in the saturation tower absorbed air, send into the desorption tower top and carry out the desorption with nitrogen gas, desorption liquid after the desorption is sent into the absorption tower by the absorption pump, the oxygen formation oxygen-enriched water in the absorption tower absorbed air discharges to circulating water tank after detecting, the utility model has the advantages of safe in utilization, the experimental data is accurate reliable.
Description
Technical Field
The utility model belongs to the technical field of the chemical industry experiment, especially, relate to a three-tower absorption and desorption experimental apparatus.
Background
At present, ammonia, carbon dioxide and oxygen are used as gas source gas in most of devices used in absorption and desorption teaching experimental equipment in China, but ammonia and carbon dioxide gas steel cylinders are dangerous when being placed in a laboratory, tap water is often required to be continuously used in the experimental process of the existing absorption and desorption experimental device, the requirement on the installation environment is high, and water resources are wasted. In addition, the work of current absorption and desorption experimental apparatus does not possess the continuity, and the student of this class has done the experiment after when doing the experiment at next class, and experimental facilities still need prepare in advance, these all lead to the condition that the teaching is inefficient, and often the time of a lesson is limited, and the experimental data that survey when student's experiment in the short time is unstable.
Disclosure of Invention
The utility model aims at providing a three-tower absorption and desorption experimental apparatus has safe in utilization, the accurate reliable advantage of experimental data.
In order to achieve the above purpose, the utility model adopts the technical scheme that:
a three-tower absorption and desorption experimental device comprises a saturation tower, a desorption tower and an absorption tower which are vertically arranged, and further comprises a fan and N2The air outlet of the fan is divided into two paths, wherein one path enters the saturation tower through a saturation tower air rotor flow meter FI02 and is in countercurrent contact with an absorbent sprayed from the top of the saturation tower for absorption, and the other path enters the absorption tower through a flow meter FI06 and is in countercurrent contact with an oxygen-poor aqueous solution sprayed from the top of the absorption tower for absorption; said N is2The bottle is decompressed by a pressure reducing valve, and then enters a desorption tower through a pipeline after being metered by a regulating valve VA04 and a flowmeter FI04 to perform countercurrent desorption with oxygen saturated water at the top of the tower; an outlet pipeline of the circulating water tank is metered by a saturation pump and a rotor flow meter FI01 and then is sent to the top of the saturation tower to be used as an absorbent, the bottom liquid enters the top of the desorption tower through a desorption pump and a turbine flow meter FI03, and the desorption liquid and the desorption gas N in the desorption tower2The solution flows into the bottom of the tower after contacting, and the desorbed solution enters the top of the absorption tower through an absorption pump and a turbine flowmeter FI 05; and the solution at the top of the absorption tower and the air are absorbed in a countercurrent mode and then overflow to a circulating water tank.
Further, the liquid in the circulating water tank is deionized water.
Further, the bottoms of the saturation tower, the desorption tower and the absorption tower are all provided with overflow pipelines, the overflow pipelines are all connected with a tower bottom liquid outlet pipeline, the overflow pipelines are inverted U-shaped pipelines, the top of each overflow pipeline is higher than the bottom of the tower, and outlets of the overflow pipelines are all communicated with a circulating water tank.
Furthermore, the bottoms of the saturation tower, the desorption tower and the absorption tower are respectively provided with an emptying pipeline, and the outlet of the emptying pipeline is communicated with a trench.
Furthermore, sampling valves are arranged at the outlets of the desorption pump and the absorption pump, and a liquid outlet pipeline at the bottom of the absorption tower is also provided with the sampling valve; the rotameter FI01 is a saturation tower liquid rotameter with the measuring range of 100-1000L/hFI02 is a saturation tower air rotor flow meter, and the measuring range is 0.3-3 m3The turbine flowmeter FI03 is a desorption tower liquid turbine flowmeter with the range of 200-1000L/h, the flowmeter FI04 is a desorption tower nitrogen mass flowmeter with the flow rate of 20L/min, the turbine flowmeter FI05 is an absorption tower liquid turbine flowmeter with the range of 200-1000L/h, the flowmeter FI06 is an absorption tower air mass flowmeter with the flow rate of 300L/min, and the absorption tower is further provided with a differential pressure sensor for measuring the pressure drop of the whole tower.
An experimental process of a three-tower absorption and desorption experimental device comprises the following steps:
1) adding deionized water into a circulating water tank to reach 80% of the water level of the water tank, starting a saturation pump, adjusting a rotor flow meter FI01 to 600L/h, opening a fan to adjust the rotating speed to 1000rpm, adjusting an air flow adjusting valve to enable the flow of the flow meter FI02 to be 2m3/h, and enabling a saturation tower to stably operate for 10min until the water in the circulating water tank is oxygen saturated water;
2) starting a desorption pump, opening a main valve and a pressure reducing valve of a nitrogen steel cylinder, adjusting the flow rate of nitrogen to be 7L/min, adjusting the flow rate of desorption liquid, and respectively recording the dissolved oxygen values of the liquid at the bottom of the desorption tower when the flow rates of the desorption liquid are 200, 280, 360 and 450L/h;
3) after the desorption tower experiment is finished, stabilizing the liquid flow rate of 450L/h and the nitrogen flow rate of 7L/min of the desorption tower, starting an absorption pump, adjusting the air flow rate of 7L/min of the absorption tower, and respectively recording the oxygen contents of the solutions at the bottom of the desorption tower and the bottom of the absorption tower when the flow rates of the absorption liquids are 200, 280, 360 and 450L/h;
4) and (3) after the step 3) is finished, closing the main valve of the nitrogen steel cylinder, closing the pressure reducing valve after the nitrogen flowmeter has no flow, turning off the water pump, and stopping the fan.
Furthermore, in order to save the experimental time and reduce the nitrogen usage amount, the experimental step 2-3 is replaced by a method of simultaneously carrying out experiments on the absorption tower and the desorption tower, namely, the nitrogen flow of the desorption tower is 7L/min, the air flow of the absorption tower is 7L/min, and the oxygen contents of the solutions at the bottom of the desorption tower and the bottom of the absorption tower are respectively recorded when the desorption liquid flow is 200, 280, 360 and 450L/h and when the liquid flow of the absorption tower is 250, 330 and 410L/h.
Description of the procedure of this experimental apparatus:
air: the air comes from a fan outlet header pipe and is divided into two paths: one path enters the bottom of the saturation tower through a flowmeter FI02, is in countercurrent contact with an absorbent sprayed from the top of the tower for absorption, and exhausts the absorbed tail gas to the atmosphere; the other path enters the bottom of the absorption tower through a flowmeter FI06, and is in countercurrent contact with the oxygen-deficient aqueous solution sprayed from the top of the tower for absorption, and the absorbed tail gas is discharged into the atmosphere;
N2: n in the steel cylinder2The oxygen-saturated water enters a desorption tower through a pressure reducing valve, an adjusting valve VA05 and a flowmeter FI04 and is discharged into the atmosphere after being desorbed with the oxygen-saturated water at the top of the tower in a countercurrent manner;
water: the absorption water of the saturation tower is deionized water in a water tank, the water in the water tank is firstly sent to the top of the saturation tower through a saturation pump and a rotor flow meter FI01, the deionized water absorbs oxygen in air and then enters the bottom of the tower, part of tower bottom liquid enters the top of a desorption tower through a desorption pump and a turbine flow meter FI03, desorption liquid and desorption gas contact and then flow into the bottom of the tower, part of desorbed solution enters the absorption tower through an absorption pump and a turbine flow meter FI05, and the solution at the top of the absorption tower and the air are absorbed in a countercurrent mode and then overflow to a circulating water tank.
The device has instrument parameters
A saturation tower: the inner diameter of the tower is 100 mm; the height of the filler layer is 850 mm; the filler is a phi 6 stainless steel theta ring; screen defoaming
A desorption tower: the inner diameter of the tower is 78 mm; the height of the filler layer is 850 mm; the filler is a phi 6 stainless steel calendering ring; screen defoaming
An absorption tower: the inner diameter of the tower is 78 mm; the height of the filler layer is 850 mm; the filler is phi 6 stainless steel pall rings; screen defoaming
A fan: vortex pump, 16kPa, 145m 3/h;
saturation pump, desorption pump, absorption pump: rated parameters are as follows: the lift is 4m, and the flow is 22L/min;
a saturation tank: PE, 50L
Temperature: pt100 sensor
A flow meter: saturation tower liquid rotameter: 100-1000L/h;
saturation tower air rotameter: 0.3 to 3m3/h；
Desorption tower liquid turbine flowmeter: 200-1000L/h;
the mass flow meter of the nitrogen of the desorption tower is as follows: 20L/min;
absorption tower liquid turbine flowmeter: 200-1000L/h;
absorption tower air mass flow meter: 300L/min;
the utility model discloses an experimental principle: according to the mass transfer rate equation, an absorption rate equation is derived under the condition of constant Kxa, isothermy and low absorption rate (or low concentration, difficult dissolution and the like):
Ga=Kxa·V·ΔXm
then: kxa = Ga/(V.DELTA.Xm)
In the formula: kxa-volume mass transfer coefficient [ kmol/m ]3·h]
Ga-absorption of packed column [ kmol/h ]
V-volume of packing layer [ m3]
Delta Xm-average driving force of packed column
1. Desorption experiment
Calculation of Ga
It is known to measure: from mass flow
Measurable water flow Vs L/h]Air flow rate VB[L/min] ，x1The dissolved oxygen value of saturated water in the saturation tower can be obtained by looking up a table, x2Can be calculated by direct reading of an oxygen dissolving instrument:
x2=DO01/MO2/(ρwater (W)/MWater (W))*10-3
Ls（mol/h）=Vs×ρWater (W)/MWater (W)
（mol/h）
Thus, L can be calculatedS、GB。
And the material balance of the whole tower is as follows: absorption = Ls (x)1-x2)=GB(y1-y2)
y1If =0, Ga and y can be calculated2
⑵、ΔXmIs calculated by
The Henry constant E (atm) can be obtained by interpolation according to the measured water temperature, and m = E/P is obtained when P =1(atm) is adopted in the experiment
2. Absorption test
Calculation of Ga
It is known to measure: from mass flow
Measurable water flow Vs L/h]Air flow rate VB[L/min] ，x1And x2Can be calculated by direct reading of an oxygen dissolving instrument:
x1=DO02/MO2/(ρwater (W)/MWater (W))*10-3
x2=DO01/MO2/(ρWater (W)/MWater (W))*10-3
Ls（mol/h）=Vs×ρWater (W)/MWater (W)
（mol/h）
Thus, L can be calculatedS、GB。
And the material balance of the whole tower is as follows: absorption = Ls (x)1-x2)=GB(y1-y2)
y1By =0.21, Ga and y can be calculated2
⑵、ΔXmIs calculated by
The Henry constant E (atm) can be obtained by interpolation according to the measured water temperature, and m = E/P is obtained when P =1(atm) is adopted in the experiment
At different temperatures O2—H2Henry constant of O
| Temperature (t) | 5 | 10 | 15 | 20 | 25 | 30 | 35 | 40 |
| E (atmospheric pressure) x10-6/kPa | 2.95 | 3.31 | 3.69 | 4.06 | 4.44 | 4.81 | 5.14 | 5.42 |
The utility model has the advantages that: the device has the advantages of safe experiment system, convenient installation and operation, realizes the continuous running of the experiment process and the recycling of the experiment water, can learn the absorption and desorption process, learns the absorption and desorption principle and operation, calculates data, and is used for teaching and absorption of laboratory lab tests with convenient and fast and safe use.
Drawings
Fig. 1 is a schematic view of the process flow structure of the present invention.
1-nitrogen cylinder, 2-saturation tower, 3-desorber, 4-absorption tower, 5-circulation tank, valve: VA 01-saturation column liquid flow regulating valve, VA 02-saturation column air flow regulating valve, VA 03-desorption column liquid flow regulating valve, VA 04-desorption column nitrogen flow regulating valve, VA 05-absorption column liquid flow regulating valve, VA 06-absorption column air flow regulating valve, VA 08-DO 01 protection liquid valve, VA 09-DO 02 protection liquid valve, VA07, VA10, VA11, VA 12-tower body and circulating water tank purge valve, AI 01-saturation column bottom sampling valve, AI 02-desorption column bottom sampling valve, AI 03-absorption column bottom sampling valve, temperature: TI 01-liquid phase temperature at the bottom of the saturation column, TI 02-air temperature, DO 01-oxygen content of the bottom solution of the desorption column, DO 02-oxygen content of the bottom solution of the absorption column, flow meter: FI 01-saturation tower liquid rotor flow meter, FI 02-saturation tower air rotor flow meter, FI 03-desorption tower liquid turbine flow meter, FI 04-desorption tower nitrogen mass flow meter, FI 05-absorption tower liquid turbine flow meter, FI 06-absorption tower air mass flow meter, P01-saturation pump, P02-desorption pump, P03-absorption pump, P04-fan, PDI 01-differential pressure sensor.
Detailed Description
Examples
The utility model provides a three tower absorption and desorption experimental apparatus, includes the saturation tower 2, desorber 3 and the absorption tower 4 of vertical setting, still includes fan P04, N2The air outlet of the fan P04 is divided into two paths, wherein one path enters the saturation tower 2 through a saturation tower air rotor flow meter FI02 and is in countercurrent contact with an absorbent sprayed from the top of the saturation tower 2 for absorption, and the other path enters the absorption tower 4 through an absorption tower air mass flow meter FI06 and is in countercurrent contact with an oxygen-poor aqueous solution sprayed from the top of the absorption tower 4 for absorption; said N is2The bottle 1 is decompressed by a pressure reducing valve, and then enters a desorption tower 3 through a pipeline to perform countercurrent desorption with oxygen saturated water at the top of the tower after being metered by a desorption tower nitrogen flow regulating valve VA04 and a flowmeter FI 04; an outlet pipeline of the circulating water tank 5 is metered by a saturation pump P01 and a rotor flowmeter FI01 and then is sent to the top of the saturation tower 2 to be used as an absorbent, and the bottom liquid enters the tower through a desorption pump P02 and a turbine flowmeter FI03The top of the desorption tower 3, the desorption liquid and the desorption gas N in the desorption tower 32The solution flows into the bottom of the absorption tower 4 after contacting, and the desorbed solution enters the top of the absorption tower 4 through an absorption pump P03 and a turbine flowmeter FI 05; the solution at the top of the absorption tower 4 and the air are absorbed in a countercurrent mode and then overflow to a circulating water tank 5.
Further, the liquid in the circulating water tank 5 is deionized water.
Further, saturation tower 2, desorber 3 and 4 tower bottoms of absorption tower all are equipped with overflow pipe, and overflow pipe all links to each other with tower bottom liquid outlet pipe, and overflow pipe is the type of falling U pipeline, and the overflow pipe top sets up at the bottom of the tower higher than, and the overflow pipe export all is linked together with circulation tank 4.
Furthermore, the bottoms of the desorption tower 3 and the absorption tower 4 of the saturation tower 2 are respectively provided with an emptying pipeline, and the outlet of the emptying pipeline is communicated with a trench.
Further, sampling valves are arranged at outlets of the desorption pump P02 and the absorption pump P03, sampling valves are also arranged on a liquid outlet pipeline at the bottom of the absorption tower, and the sampling valves are respectively a saturation tower bottom sampling valve AI01, a desorption tower bottom sampling valve AI02 and an absorption tower bottom sampling valve AI 03; the rotor flow meter FI01 is a saturation tower liquid rotor flow meter, the measuring range of the rotor flow meter FI01 is 1000L/h, and the flow meter FI02 is a saturation tower air rotor flow meter, the measuring range of the flow meter FI02 is 0.3-3 m3h, the turbine flowmeter FI03 is a desorption tower liquid turbine flowmeter with the range of 200 and 1000L/h, the flowmeter FI04 is a desorption tower nitrogen mass flowmeter, the flow rate is 20L/min, the turbine flowmeter FI05 is an absorption tower liquid turbine flowmeter, the measuring range is 200-1000L/h, the flow meter FI06 is an air mass flow meter of the absorption tower, the flow rate of the device is 300L/min, a differential pressure sensor PDI01 for measuring the pressure drop of the whole tower is further arranged on the absorption tower, a saturation tower liquid flow regulating valve VA01 and a saturation tower air flow regulating valve VA02 are further arranged on a saturation tower pipeline, a desorption tower liquid flow regulating valve VA03 and a desorption tower nitrogen flow regulating valve VA04 are arranged on a desorption tower pipeline, an absorption tower liquid flow regulating valve VA05 and an absorption tower air flow regulating valve VA06 are arranged on an absorption tower pipeline, and the VA08 and the VA09 are convenient for keeping two oxygen dissolving instruments DO01 and DO02 wet when the experimental device is not used in a short time.And in a moistening state, the bottoms of the three tower bodies and the circulating water tank are respectively provided with a purge valve VA07, a VA10, a VA11 and a VA12, the saturation tower is also provided with a measurement point of the liquid phase temperature TI01 at the bottom of the saturation tower and a measurement point of the water tank temperature TI02, the desorption tower is provided with a measurement point of the oxygen content DO01 of the solution at the bottom of the desorption tower, the absorption tower is provided with an oxygen content DO02 of the solution at the bottom of the absorption tower, and the measurement of the oxygen content adopts an.
An experimental process of a three-tower absorption and desorption experimental device comprises the following steps:
1) adding deionized water into a circulating water tank to reach 80% of the water level of the water tank, starting a saturation pump, adjusting a rotor flow meter FI01 to 600L/h, opening a fan to adjust the rotating speed to 1000rpm, adjusting an air flow adjusting valve to enable the flow of the flow meter FI02 to be 2m3/h, and enabling a saturation tower to stably operate for 10min until the water in the circulating water tank is oxygen saturated water;
2) starting a desorption pump, opening a main valve and a pressure reducing valve of a nitrogen steel cylinder, adjusting the flow rate of nitrogen to be 7L/min, adjusting the flow rate of desorption liquid, and respectively recording the dissolved oxygen values of the liquid at the bottom of the desorption tower when the flow rates of the desorption liquid are 200, 280, 360 and 450L/h;
3) after the desorption tower experiment is finished (four groups of desorption experiment data are obtained), stabilizing the liquid flow rate of 450L/h and the nitrogen flow rate of 7L/min in the desorption tower, starting an absorption pump, adjusting the air flow rate of 7L/min in the absorption tower, and respectively recording the oxygen contents of the solutions at the bottom of the desorption tower and the bottom of the absorption tower when the flow rates of the absorption liquid are 200, 280, 360 and 450L/h;
4) and (3) after the step 3) is finished, closing the main valve of the nitrogen steel cylinder, closing the pressure reducing valve after the nitrogen flowmeter has no flow, turning off the water pump, and stopping the fan.
Furthermore, in order to save the experimental time and reduce the nitrogen usage amount, the experimental step 2-3 is replaced by a method of simultaneously carrying out experiments on the absorption tower and the desorption tower, namely, the nitrogen flow of the desorption tower is 7L/min, the air flow of the absorption tower is 7L/min, and the oxygen contents of the solutions at the bottom of the desorption tower and the bottom of the absorption tower are respectively recorded when the desorption liquid flow is 200, 280, 360 and 450L/h and when the liquid flow of the absorption tower is 250, 330 and 410L/h.
First, the flow of the experimental apparatus is described:
air: the air comes from a fan outlet header pipe and is divided into two paths: one path enters the bottom of the saturation tower through a flowmeter FI02, is in countercurrent contact with an absorbent sprayed from the top of the tower for absorption, and exhausts the absorbed tail gas to the atmosphere; the other path enters the bottom of the absorption tower through a flowmeter FI06, and is in countercurrent contact with the oxygen-deficient aqueous solution sprayed from the top of the tower for absorption, and the absorbed tail gas is discharged into the atmosphere;
N2: n in the steel cylinder2The oxygen-saturated water enters a desorption tower through a pressure reducing valve, an adjusting valve VA05 and a flowmeter FI04 and is discharged into the atmosphere after being desorbed with the oxygen-saturated water at the top of the tower in a countercurrent manner;
water: the absorption water is deionized water in a water tank, the water in the water tank is firstly sent to the top of a saturation tower through a saturation pump and a rotor flow meter FI01, the deionized water absorbs oxygen in air and then enters the bottom of the tower, part of tower bottom liquid enters the top of a desorption tower through a desorption pump and a turbine flow meter FI03, desorption liquid and desorption gas contact and then flow into the bottom of the tower, part of desorbed solution enters an absorption tower through an absorption pump and a turbine flow meter FI05, and the solution at the top of the absorption tower and the air are absorbed in a countercurrent mode and then overflow to a circulating water tank.
Second, the equipment and meter parameters of the device
A saturation tower: the inner diameter of the tower is 100 mm; the height of the filler layer is 850 mm; the filler is a phi 6 stainless steel theta ring; screen defoaming
A desorption tower: the inner diameter of the tower is 78 mm; the height of the filler layer is 850 mm; the filler is a phi 6 stainless steel calendering ring; screen defoaming
An absorption tower: the inner diameter of the tower is 78 mm; the height of the filler layer is 850 mm; the filler is phi 6 stainless steel pall rings; screen defoaming
A fan: vortex pump, 16kPa, 145m 3/h;
saturation pump, desorption pump, absorption pump: rated parameters are as follows: the lift is 4m, and the flow is 22L/min;
a saturation tank: PE, 50L
Temperature: pt100 sensor
A flow meter: saturation tower liquid rotameter: 100-1000L/h;
saturation tower air rotameter: 0.3 to 3m3/h；
Desorption tower liquid turbine flowmeter: 200-1000L/h;
the mass flow meter of the nitrogen of the desorption tower is as follows: 20L/min;
absorption tower liquid turbine flowmeter: 200-1000L/h;
absorption tower air mass flow meter: 300L/min;
third, experimental operation steps
1. Absorption and desorption experiment
1) Deionized water is added into the water tank until the water level is about 80 percent of the water tank liquid level, a saturation pump is started, and FI01 is adjusted to 600L/h. The fan is opened to adjust the rotating speed to 1000rpm, and the air flow adjusting valve is adjusted to FI02 to be 2m3And h, stably operating the saturation tower for a period of time (about ten minutes) until the water in the circulating water tank is oxygen saturated water, and looking up the dissolved oxygen concentration in the saturated water at different temperatures.
2) And after circulating water is saturated, starting a desorption pump, opening a main valve and a pressure reducing valve of a nitrogen steel cylinder, adjusting the flow of nitrogen to be 7L/min, adjusting the flow of desorption liquid, and recording the dissolved oxygen values of the liquid at the bottom of the desorption tower when the flow of the desorption liquid is 200, 280, 360 and 450L/h respectively.
3) After the desorption tower experiment is finished, stabilizing the liquid flow of the desorption tower at 450L/h and the nitrogen flow at 7L/min, starting an absorption pump, adjusting the air flow of the absorption tower at 7L/min, and respectively recording the oxygen contents of the solutions at the bottom of the desorption tower and the bottom of the absorption tower when the flow of the absorption liquid is 200, 280, 360 and 450L/h.
4) The experiment process can adopt the 2-3 experiment method or the method of simultaneously adopting the absorption tower and the desorption tower, namely: the nitrogen flow of the desorption tower is 7L/min, the air flow of the absorption tower is 7L/min, and the oxygen contents of the solutions at the bottom of the desorption tower and the bottom of the absorption tower are respectively recorded when the desorption liquid flow is 200, 280, 360 and 450L/h and when the liquid flow of the absorption tower is 250, 330 and 410L/h.
The method of step 4 is recommended to be used for the experiment, so that the experiment time can be saved, and the use amount of nitrogen can be reduced.
5) After the experiment is finished, the main valve of the nitrogen steel cylinder is closed, the pressure reducing valve is closed after the nitrogen flowmeter has no flow, the water pump is turned off, and the fan is stopped.
2. Experiment of fluid mechanics
1) Adding deionized water into the water tank to the liquid level of the water tankAbout 80 percent of the total amount of the air, starting a saturation pump, adjusting FI01 to 600L/h, opening a fan to adjust the rotating speed to 1000rpm, and adjusting an air flow adjusting valve to FI02 to be 2m3/h。
2) Starting a desorption pump, and adjusting the liquid flow of the desorption tower to be 450L/h.
3) And (3) adjusting the gas flow of the absorption tower, and determining the relation between the tower inlet gas flow of the dry packing and the pressure drop of the whole tower when the liquid flow of the absorption tower is 0.
4) And starting an absorption pump, selecting proper air quantity, increasing liquid feeding quantity to carry out pre-flooding on the packed tower, and ensuring that the packing is fully wetted.
5) Keeping the liquid flow of the absorption tower at 100L/h, adjusting the air inlet flow of the absorption tower, and reading the air inlet flow of the absorption tower sequentially to be 1m3/h，2m3/h，3m3/h，4m3And h, the pressure drop of the whole absorption tower until the flooding.
6) And 5) sequentially recording the relationship between the tower inlet gas flow of the absorption tower and the pressure drop of the whole tower when the liquid flow of the absorption tower is 200L/h and 300L/h.
Note that: and after the liquid flow of the absorption tower is increased, the gas flow during flooding is sequentially reduced, and the data interval is adjusted in time.
3. When the equipment is not used for a long time, the valves VA08 and VA09 are required to be closed, the dissolved oxygen meters (DO 01 and DO 02) are kept in a wet state all the time, and the drain valves of the tower body and the water tank are opened to drain the liquid in the tower body and the water tank.
Points of attention
1. Before the oxygen dissolving instrument is used, an electrode membrane head is checked, and if bubbles exist in the electrode membrane head, the measured value is influenced to be inaccurate or the numerical value fluctuates. At the moment, the power supply is disconnected, the membrane head is stably taken down to pour the residual electrolyte in the membrane head into the waste liquid pool, new electrolyte is added again until the waste liquid pool is full, and then the membrane head is slowly screwed into the electrode inner core clockwise until liquid beads flow out.
2. The electrode should be cleaned regularly, and if the electrode membrane head has dirt, stickers or scales, the electrode should be cleaned in time.
3. The membrane head after the electrolyte is added is forbidden to be placed in the air for a long time, and the maximum time is recommended to be not more than 30 min.
4. When the electrode does not need to be stored for a short time, the electrode is taken out, cleaned and sleeved with a protective sleeve containing water for storage; when the electrode does not need to be stored for a long time, the electrolyte is emptied, the cathode and the anode and the membrane head are thoroughly cleaned by water with the temperature of 30-40 ℃, and the electrode is sleeved with a protective sleeve after being dried, and is placed in a dry place at room temperature for storage.
5. When the equipment is not used for a long time, the water in the equipment is completely discharged.
6. The students are strictly prohibited to open the electric cabinet so as to avoid electric shock.
Fifthly, data processing
1. Calculating the total volume mass transfer coefficients of liquid phases of the desorption tower and the absorption tower under different conditions;
2. plotting K on a log-log scaleXa and liquid spray density [ kmol/m ]2·h]A graph of the relationship between.
Claims (5)
1. The utility model provides a three tower absorption and desorption experimental apparatus which characterized in that: comprises a saturation tower, a desorption tower and an absorption tower which are vertically arranged, a fan and N2The air outlet of the fan is divided into two paths, wherein one path enters the saturation tower through a saturation tower air rotor flow meter FI02 and is in countercurrent contact with an absorbent sprayed from the top of the saturation tower for absorption, and the other path enters the absorption tower through a flow meter FI06 and is in countercurrent contact with an oxygen-poor aqueous solution sprayed from the top of the absorption tower for absorption; said N is2The bottle is decompressed by a pressure reducing valve, and then enters a desorption tower through a pipeline after being metered by a regulating valve VA04 and a flowmeter FI04 to perform countercurrent desorption with oxygen saturated water at the top of the tower; the outlet pipeline of the circulating water tank is metered by a saturation pump and a rotor flow meter FI01 and then is sent to the top of a saturation tower to be used as an absorbent, the bottom liquid of the saturation tower enters the top of a desorption tower by a desorption pump and a turbine flow meter FI03, and oxygen saturated water and desorption gas N in the desorption tower2The solution flows into the bottom of the tower after contacting, and the desorbed solution enters the top of the absorption tower through an absorption pump and a turbine flowmeter FI 05; and the solution at the top of the absorption tower and the air are absorbed in a countercurrent mode and then overflow to a circulating water tank.
2. The three-column absorption and desorption experimental apparatus according to claim 1, wherein: the liquid in the circulating water tank is deionized water.
3. The three-column absorption and desorption experimental apparatus according to claim 2, wherein: the bottom of the saturation tower, the bottom of the desorption tower and the bottom of the absorption tower are respectively provided with an overflow pipeline, the overflow pipelines are all connected with a tower bottom liquid outlet pipeline, the overflow pipelines are inverted U-shaped pipelines, the top of each overflow pipeline is higher than the bottom of the tower, and the outlets of the overflow pipelines are communicated with a circulating water tank.
4. The three-column absorption and desorption experimental apparatus according to claim 3, wherein: and emptying pipelines are arranged at the bottoms of the saturation tower, the desorption tower and the absorption tower, and outlets of the emptying pipelines are communicated with a trench.
5. The three-column absorption and desorption experimental apparatus according to claim 4, wherein: the outlet of each desorption pump and the outlet of each absorption pump are provided with sampling valves, and a liquid outlet pipeline at the bottom of each absorption tower is also provided with a sampling valve; the rotor flow meter FI01 is a saturation tower liquid rotor flow meter, the measuring range of the rotor flow meter FI01 is 1000L/h, and the flow meter FI02 is a saturation tower air rotor flow meter, the measuring range of the flow meter FI02 is 0.3-3 m3The turbine flowmeter FI03 is a desorption tower liquid turbine flowmeter with the range of 200-1000L/h, the flowmeter FI04 is a desorption tower nitrogen mass flowmeter with the flow rate of 20L/min, the turbine flowmeter FI05 is an absorption tower liquid turbine flowmeter with the range of 200-1000L/h, the flowmeter FI06 is an absorption tower air mass flowmeter with the flow rate of 300L/min, and the absorption tower is further provided with a differential pressure sensor for measuring the pressure drop of the whole tower.
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| CH409876A (en) * | 1963-12-20 | 1966-03-31 | Sulzer Ag | Method and device for separating gaseous components from gas mixtures |
| DE29719775U1 (en) * | 1996-12-11 | 1998-02-05 | Sgi Prozess Technik Gmbh | Pressure change system for extracting oxygen from the air |
| CN201280447Y (en) * | 2008-08-29 | 2009-07-29 | 武奋超 | Circulating air lift deoxidization apparatus |
| CN201643963U (en) * | 2009-12-31 | 2010-11-24 | 攀钢集团攀枝花钢铁研究院有限公司 | Acidic component absorption-desorption test device |
| JP5717112B2 (en) * | 2010-09-26 | 2015-05-13 | 中国科学院過程工程研究所 | Ionic liquid solvent and gas purification method |
| KR101354905B1 (en) * | 2012-03-21 | 2014-01-24 | 한국에너지기술연구원 | Continuous oxygen separation method and apparatus using oxygen selective sorbent |
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