CN111530113B - Liquid distribution test system in large-scale packed tower and operation method - Google Patents
Liquid distribution test system in large-scale packed tower and operation method Download PDFInfo
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- CN111530113B CN111530113B CN202010376588.6A CN202010376588A CN111530113B CN 111530113 B CN111530113 B CN 111530113B CN 202010376588 A CN202010376588 A CN 202010376588A CN 111530113 B CN111530113 B CN 111530113B
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- 239000007788 liquid Substances 0.000 title claims abstract description 229
- 238000012360 testing method Methods 0.000 title claims abstract description 70
- 238000000034 method Methods 0.000 title claims abstract description 11
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 153
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 75
- 238000012856 packing Methods 0.000 claims abstract description 53
- 239000000945 filler Substances 0.000 claims description 35
- 238000001816 cooling Methods 0.000 claims description 27
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 27
- 238000000926 separation method Methods 0.000 claims description 19
- 239000007789 gas Substances 0.000 claims description 17
- 230000001174 ascending effect Effects 0.000 claims description 3
- 238000005507 spraying Methods 0.000 claims description 3
- 230000005540 biological transmission Effects 0.000 claims description 2
- 239000000463 material Substances 0.000 claims description 2
- 238000002791 soaking Methods 0.000 claims description 2
- 238000004154 testing of material Methods 0.000 claims 3
- 238000009825 accumulation Methods 0.000 abstract description 9
- 230000008676 import Effects 0.000 description 6
- 241000521257 Hydrops Species 0.000 description 3
- 206010030113 Oedema Diseases 0.000 description 3
- 229910001873 dinitrogen Inorganic materials 0.000 description 3
- 238000003556 assay Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008054 signal transmission Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D3/00—Distillation or related exchange processes in which liquids are contacted with gaseous media, e.g. stripping
- B01D3/14—Fractional distillation or use of a fractionation or rectification column
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D3/00—Distillation or related exchange processes in which liquids are contacted with gaseous media, e.g. stripping
- B01D3/42—Regulation; Control
Abstract
The invention discloses a liquid distribution test system in a large-scale packing tower and an operation method thereof, the system comprises a packing test rectifying tower, a liquid accumulation groove is arranged at the bottom in the packing test rectifying tower, a plurality of square liquid accumulation unit grids are arranged above the liquid accumulation groove of the packing test rectifying tower and are used for collecting liquid falling from different sections of packing, nitrogen and organic working media are utilized for simulating the distribution condition of falling liquid under the working condition pressure and the gas-liquid load condition of the rectifying tower, and the organic liquid and liquid air in the system have similar surface tension, so that the actual flowing state of the liquid air in the rectifying tower can be better simulated.
Description
Technical Field
The invention relates to a liquid distribution test system and an operation method, in particular to a liquid distribution test system and an operation method in a large-scale packing tower, and belongs to the field of industrial rectification.
Background
At present, industrial rectification equipment is developing towards large scale, so the diameter of a rectification column is continuously increased, the diameter of the rectification column is known to be up to the order of 10m, but along with the increase of the diameter of the rectification column, the bias flow severity of descending liquid in the column is rapidly increased, and at present, the published data show that most rectification filler descending liquid distribution test devices simulate rectification two-phase media by adopting air and water, and certain inconsistency exists between the development of fluid viscosity, surface tension and the like and the actual rectification condition, and in addition, the distribution condition of the descending liquid on the radial section of the filler cannot be accurately quantified basically observed by naked eyes for the descending liquid distribution at the bottom of the rectification column.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides the liquid distribution test system in the large-scale packed tower, which has the technical characteristics of simulating the distribution condition of the descending liquid under the working condition pressure and gas-liquid load condition of the rectifying tower by utilizing nitrogen and organic liquid.
It is another object of the present invention to provide a method of operating a liquid distribution testing system in a large packed column.
In order to achieve the above purpose, the present invention is realized by the following technical scheme:
the utility model provides a liquid distribution test system in large-scale packing tower, includes the experimental rectifying column of packing, the bottom in the experimental rectifying column of packing is equipped with the hydrops groove, the hydrops groove top is provided with a plurality of square hydrops unit check in order to be used for collecting the liquid that descends from the different cross-sections of packing.
As an improvement, gaps on the circumference of the inner wall of the packing test rectifying tower are removed, and 112 square unit cells are arranged in total.
As an improvement, be connected with the gas-liquid separation post below square unit check, the gas-liquid separation filter screen is filled in the gas-liquid separation post in order to separate out the gas in the decline liquid, the gas-liquid separation post lower extreme is connected with the liquid collection post, be equipped with level sensor in the liquid collection post, level sensor is connected with PLC, and the liquid that goes through the gas-liquid separation filter screen gas-liquid separation falls into the liquid collection post.
The utility model provides an improvement, still including the nitrogen pipe network that has stop valve a and have the outlet line of air-blower, nitrogen pipe network branch road and outlet line converge in order to realize interior ordinary pressure nitrogen gas and converge, get into nitrogen gas cooling heat exchanger hot junction import after converging, nitrogen gas cooling heat exchanger hot junction export is connected with stop valve b import, stop valve c import respectively, stop valve b export is connected with the experimental rectifying column gas inlet of packing, stop valve c export is connected with the gaseous import of organic liquid storage tank, be connected with temperature sensor a between stop valve b import and the stop valve c import, be connected with pressure sensor between stop valve b export and the experimental rectifying column gas inlet of packing, temperature sensor a, pressure sensor all connect on PLC so that temperature signal, pressure signal transmission show through the terminal to PLC.
As an improvement, the bottom of the packing test rectifying tower is connected with an organic liquid outlet pipeline, the organic liquid outlet pipeline is respectively connected with a liquid pump inlet and a liquid stop valve outlet, the liquid stop valve inlet is connected to a liquid outlet of a machine liquid storage tank, the liquid pump outlet is respectively connected with a stop valve e inlet and a heat exchanger hot end inlet, the stop valve e outlet is connected to a liquid inlet of the machine liquid storage tank, the heat exchanger hot end outlet is connected with a stop valve fInlet, the stop valve fInlet is connected to a liquid inlet at the upper part of the packing test rectifying tower, a temperature sensor b is arranged between the heat exchanger hot end outlet and the stop valve inlet, and the temperature sensor b is connected with a PLC to realize that a temperature signal is transmitted to the PLC for display through a terminal;
as an improvement, the top exhaust port of the packing test rectifying tower is connected with an exhaust stop valve inlet, the outlet of the exhaust stop valve is connected with a gas-liquid filter inlet, the outlet of the gas-liquid filter is divided into two paths, namely an organic liquid outlet and a nitrogen outlet, the organic liquid outlet of the gas-liquid filter is connected with a stop valve Inlet, the outlet of the stop valve Inlet is connected with a liquid inlet of an organic liquid storage tank, the nitrogen outlet of the gas-liquid filter is respectively connected with a stop valve j inlet and a stop valve k inlet, and the outlet of the stop valve j is respectively connected with a blower outlet, a hot end inlet of a nitrogen cooling heat exchanger 15 and a nitrogen stop valve outlet.
As an improvement, the cold end inlet of the nitrogen cooling heat exchanger and the cold end inlet of the heat exchanger are commonly connected with a chilled water outlet of the chilled water unit, and the cold end outlet of the nitrogen cooling heat exchanger and the cold end outlet of the heat exchanger are commonly connected with a chilled water return port of the chilled water unit to form a circulating heat exchange pipeline.
As an improvement, the upper part and the lower part of the packing test rectifying tower are respectively connected with a pressure measuring port, the pressure measuring ports of the upper part and the lower part are respectively connected with a stop valve g inlet and a stop valve h inlet, the stop valve g outlet and the stop valve h outlet are commonly connected to a differential pressure measuring instrument, and the differential pressure measuring instrument is connected with a PLC so as to realize the transmission of differential pressure signals output by the differential pressure measuring instrument to the PLC for display through a terminal.
As an improvement, the blower is electrically connected with the PLC to realize that the operation and the stop of the blower are controlled by sending out a digital quantity switch signal through the PLC.
The operation method of the liquid distribution test system in the large packed tower is characterized by comprising the following steps:
1) Before starting the test device, closing all valves, fully infiltrating the surface of the filler, slowly opening a liquid stop valve, enabling organic liquid in an organic liquid storage tank to enter the bottom of the filler test rectifying tower and a liquid pump inlet, starting a liquid pump, simultaneously opening a stop valve f, enabling the organic liquid to enter the top of the filler test rectifying tower, spraying the organic liquid from the top of the filler test rectifying tower to the surface of the filler, gradually descending to the bottom of the filler test rectifying tower, then conveying the organic liquid back to the top of the filler test rectifying tower by a liquid pump, and circulating for 1.5-2 hours until the surface of the filler is fully infiltrated;
2) After the surface of the filler is fully infiltrated, starting a chilled water unit, cooling organic liquid at an outlet of a liquid pump through a heat exchanger, slowly opening a stop valve a and a stop valve b, and allowing nitrogen from the normal pressure of a pipe network to enter the bottom of a filler test rectifying tower after passing through the nitrogen cooling heat exchanger to serve as ascending gas;
3) Slowly opening an exhaust stop valve, enabling gas at the top of the packing test rectifying tower 1 to enter a gas-liquid filter, separating liquid in top exhaust, opening a stop valve i, returning the liquid separated by the gas-liquid filter to an organic liquid storage tank, dividing nitrogen at the outlet of the gas-liquid filter into two paths, and when the pressure of the gas-liquid filter reaches a preset value, opening the stop valve j, wherein nitrogen in an outlet pipeline of a blower is directly converged with nitrogen in a nitrogen pipe network; when the pressure of the gas-liquid filter is less than a preset value, a stop valve k is opened, and nitrogen is converged with the nitrogen of the pipe network after being pressurized by a blower;
the temperature sensor b detects the liquid temperature of the liquid pump outlet to serve as a basis for adjusting the heat load of the heat exchanger, the heat load adjustment of the heat exchanger is realized by changing the flow rate of chilled water in the chilled water unit, the differential pressure measuring instrument measures the pressure difference between the top and the bottom of the packing test rectifying tower, the packing resistance is determined, the pressure sensor measures the pressure of the nitrogen inlet at the bottom of the packing test rectifying tower to determine the start and stop of the blower, and the temperature sensor detects the temperature of nitrogen at the outlet of the hot end of the nitrogen cooling heat exchanger to adjust the flow rate of chilled water in the chilled water unit entering the nitrogen cooling heat exchanger.
The beneficial effects are that: the nitrogen and the organic liquid are utilized to simulate the distribution condition of descending liquid under the working condition pressure and gas-liquid load condition of the rectifying tower, the organic liquid with similar surface tension to liquid air is selected, the actual flowing state of the liquid air in the rectifying tower can be well simulated, a plurality of square effusion units are arranged at the upper part of a bottom effusion tank, the section of the whole rectifying tower is divided into a plurality of square unit grids, a effusion pipe is connected below each square unit grid and used for collecting the liquid descending from different positions of the filler, and the descending liquid flow rate of the filler at different positions is obtained through liquid level counting, so that the distribution characteristic of the descending liquid at different positions of the filler is obtained.
Drawings
FIG. 1 is a schematic diagram of an assay system of the present invention.
FIG. 2 is a cross-sectional view at A-A of the present invention.
FIG. 3 is a cross-sectional view at B-B of the present invention.
FIG. 4 is a cross-sectional view at D-D of the present invention.
Detailed Description
The present invention will be further described with reference to the accompanying drawings, but the present invention is not limited to the following examples.
1-4, a specific embodiment of a liquid distribution test system in a large packed tower is shown, and comprises a packed test rectifying tower 1, wherein a liquid accumulation tank is arranged at the bottom of the packed test rectifying tower 1, and a plurality of square liquid accumulation cells 27 are arranged above the liquid accumulation tank and used for collecting liquid descending from different sections of packing; the gaps on the circumference of the inner wall of the packing test rectifying tower 1 are removed, and 112 square unit cells 27 are arranged in total; the gas-liquid separation column 7 is connected below the square unit cell 27, a gas-liquid separation filter screen 28 is filled in the gas-liquid separation column 7 to separate gas in descending liquid, a liquid collection column 6 is connected to the lower end of the gas-liquid separation column 7, a liquid level sensor is arranged in the liquid collection column 6, the liquid level sensor is connected with a PLC29, the liquid subjected to gas-liquid separation through the gas-liquid separation filter screen 28 falls into the liquid collection column 6, descending liquid loads and descending liquid flow rates of different sections of filling materials are obtained by measuring the liquid level change of the liquid collection column 6, and liquid level signals of the liquid level sensor are transmitted to the PLC29 to be displayed through a terminal; the upper part of a liquid accumulation groove at the bottom of the packing test rectifying tower 1 is provided with a plurality of square liquid accumulation units 27, the cross section of the whole rectifying tower is divided into a plurality of square unit grids, a liquid accumulation pipe (a liquid collection column 6) is connected below each square unit grid and is used for collecting liquid descending from different positions of the packing, and the descending liquid flow rate of the packing at different positions is obtained through liquid level counting, so that the distribution characteristic of the descending liquid at different positions of the packing is obtained.
The nitrogen pipeline system is characterized by further comprising a nitrogen pipeline network with a stop valve a25 and an outlet pipeline with a blower 24, wherein a branch of the nitrogen pipeline is converged with the outlet pipeline to realize internal normal pressure nitrogen and nitrogen are converged, the converged nitrogen enters a hot end inlet of the nitrogen cooling heat exchanger 15, a hot end outlet of the nitrogen cooling heat exchanger 15 is respectively connected with a stop valve b16 inlet and a stop valve c17 inlet, the outlet of the stop valve b16 is connected with a gas inlet of the packing test rectifying tower 1, the outlet of the stop valve c17 is connected with a gas inlet of the organic liquid storage tank 19, the upper part of the organic liquid storage tank 19 is provided with a safety valve, a temperature sensor a18 is connected between the inlet of the stop valve b16 and the inlet of the stop valve c17, a pressure sensor 31 is connected between the outlet of the stop valve b16 and the gas inlet of the packing test rectifying tower 1, and the temperature sensor a18 and the pressure sensor 31 are both connected to the PLC29 to enable a temperature signal and a pressure signal to be transmitted to the PLC29 to be displayed through terminals;
the bottom of the packing test rectifying tower 1 is connected with an organic liquid outlet pipeline, the organic liquid outlet pipeline is respectively connected with an inlet of a liquid pump 8 and an outlet of a liquid stop valve 14, the inlet of the liquid stop valve 14 is connected to a liquid outlet of a machine liquid storage tank 19, the outlet of the liquid pump 8 is respectively connected with an inlet of a stop valve e13 and an inlet of a hot end of a heat exchanger 9, the outlet of the stop valve e13 is connected to the liquid inlet of the machine liquid storage tank 19, the outlet of the hot end of the heat exchanger 9 is connected with an inlet of a stop valve f11, the outlet of the stop valve f11 is connected to the liquid inlet at the upper part of the packing test rectifying tower 1, a temperature sensor b10 is arranged between the outlet of the hot end of the heat exchanger 9 and the inlet of the stop valve 11, and the temperature sensor b10 is connected with a PLC29 to realize that a temperature signal is transmitted to the PLC29 to be displayed through a terminal;
the top exhaust port of the packing test rectifying tower 1 is connected with an inlet of an exhaust stop valve 3, an outlet of the exhaust stop valve 3 is connected with an inlet of a gas-liquid filter 26, an outlet of the gas-liquid filter 26 is divided into two paths, namely an organic liquid outlet and a nitrogen outlet, the organic liquid outlet of the gas-liquid filter 26 is connected with an inlet of a stop valve i21, an outlet of the stop valve i21 is connected with a liquid inlet of an organic liquid storage tank 19, a nitrogen outlet of the gas-liquid filter 26 is respectively connected with an inlet of a stop valve j22 and an inlet of a stop valve k23, and an outlet of the stop valve j22 is respectively connected with an outlet of a blower 24, an inlet of a hot end of a nitrogen cooling heat exchanger 15 and an outlet of the nitrogen stop valve 25, and the nitrogen and the organic liquid are utilized to simulate the distribution condition of descending liquid under the working condition of the rectifying tower and the condition of gas-liquid load, and the organic liquid with similar surface tension to the liquid air is selected, so that the actual flowing state of the liquid air in the rectifying tower can be better simulated.
As an improved embodiment mode, the cold end inlet of the nitrogen cooling heat exchanger 15 and the cold end inlet of the heat exchanger 9 are commonly connected with the chilled water outlet of the chilled water unit 12, and the cold end outlet of the nitrogen cooling heat exchanger 15 and the cold end outlet of the heat exchanger 9 are commonly connected with the chilled water return port of the chilled water unit 12 to form a circulating heat exchange pipeline.
As an improved embodiment mode, the upper part and the lower part of the packing test rectifying tower 1 are respectively connected with pressure measuring ports, the pressure measuring ports of the upper part and the lower part are respectively connected with a stop valve g2 inlet and a stop valve h4 inlet, the stop valve g2 outlet and the stop valve h4 outlet are commonly connected to the differential pressure measuring instrument 5, and the differential pressure measuring instrument 5 is connected with the PLC29 to realize that differential pressure signals output by the differential pressure measuring instrument 5 are transmitted to the PLC29 to be displayed through a terminal.
As an improved embodiment, the blower 24 is electrically connected to the PLC29 to enable the operation and stop of the blower 24 to be controlled by the PLC29 issuing a digital quantity switch signal.
A method of operating a liquid distribution testing system in a large packed column, the method comprising the steps of:
1) Before starting the test device, closing all valves, fully soaking the surface of the filler, slowly opening a liquid stop valve 14, enabling organic liquid in an organic liquid storage tank 19 to enter the bottom of the filler test rectifying tower 1, enabling the liquid pump 8 and simultaneously opening a stop valve f11, enabling the organic liquid to enter the top of the filler test rectifying tower 1, spraying the organic liquid from the top of the filler test rectifying tower 1 to the surface of the filler, gradually descending to the bottom of the filler test rectifying tower 1, then conveying the organic liquid back to the top of the filler test rectifying tower 1 by the liquid pump 8, and circulating for 1.5-2 hours until the surface of the filler is fully soaked;
2) After the surface of the filler is fully infiltrated, starting a chilled water unit 12, cooling organic liquid at the outlet of a liquid pump 8 through a heat exchanger 9, slowly opening a stop valve a25 and a stop valve b16, and allowing nitrogen from the normal pressure of a pipe network to enter the bottom of the filler test rectifying tower 1 through a nitrogen cooling heat exchanger 15 to serve as ascending gas;
3) Slowly opening an exhaust stop valve 3, enabling gas at the top of the packing test rectifying tower 1 to enter a gas-liquid filter 26, separating liquid in the top exhaust, opening a stop valve i21, returning the liquid separated by the gas-liquid filter 26 to an organic liquid storage tank 19, dividing nitrogen at an outlet of the gas-liquid filter 26 into two paths, and when the pressure of the gas-liquid filter 26 reaches a preset value, opening a stop valve j22, wherein nitrogen in an outlet pipeline of a blower 24 is directly converged with nitrogen in a nitrogen pipe network; when the pressure of the gas-liquid filter 26 is less than a preset value, a stop valve k23 is opened, and nitrogen is pressurized by a blower 24 and then is converged with the nitrogen of the pipe network;
the temperature sensor b10 detects the temperature of the outlet liquid of the liquid pump 8 to be used as the basis for adjusting the heat load of the heat exchanger 9, the heat load adjustment of the heat exchanger 9 is realized by changing the flow rate of chilled water in the chilled water unit 12, the differential pressure measuring instrument 5 measures the pressure difference between the top and the bottom of the packing test rectifying tower 1, the packing resistance is determined, the pressure sensor 31 measures the pressure of the nitrogen inlet at the bottom of the packing test rectifying tower 1 to determine the start and stop of the blower 24, and the temperature sensor 18 detects the temperature of the nitrogen at the outlet of the hot end of the nitrogen cooling heat exchanger 15 to adjust the flow rate of chilled water in the chilled water unit 12 entering the nitrogen cooling heat exchanger 15.
Finally, it should be noted that the invention is not limited to the above embodiments, but that many variants are possible. All modifications directly derived or suggested to one skilled in the art from the present disclosure should be considered as being within the scope of the present invention.
Claims (2)
1. A liquid distribution test system in a large-scale packed tower is characterized in that: the packing material testing and rectifying device comprises a packing material testing and rectifying tower (1), wherein a liquid collecting tank is arranged at the bottom in the packing material testing and rectifying tower (1), and a plurality of square liquid collecting unit grids are arranged above the liquid collecting tank and used for collecting liquid descending from different sections of packing materials;
removing gaps on the circumference of the inner wall of the packing test rectifying tower (1), and arranging 112 square unit cells (27) in total;
the gas-liquid separation device is characterized in that a gas-liquid separation column (7) is connected below the square unit grid (27), a gas-liquid separation filter screen (28) is filled in the gas-liquid separation column (7) to separate gas in descending liquid, a liquid collecting column (6) is connected to the lower end of the gas-liquid separation column (7), a liquid level sensor is arranged in the liquid collecting column (6), the liquid level sensor is connected with a PLC (29), and the liquid subjected to gas-liquid separation through the gas-liquid separation filter screen (28) falls into the liquid collecting column (6);
the device comprises a packing test rectifying tower (29), and is characterized by further comprising a nitrogen pipe network with a stop valve a and an outlet pipeline with a blower (24), wherein a branch of the nitrogen pipe network is converged with the outlet pipeline to realize internal normal pressure nitrogen and nitrogen are converged, the nitrogen enters a hot end inlet of the nitrogen cooling heat exchanger (15), a hot end outlet of the nitrogen cooling heat exchanger (15) is respectively connected with a stop valve b (16) inlet and a stop valve c (17) inlet, the outlet of the stop valve b (16) is connected with a gas inlet of the packing test rectifying tower (1), the outlet of the stop valve c (17) is connected with a gas inlet of an organic liquid storage tank (19), a temperature sensor a (18) is connected between the inlet of the stop valve b (16) and the inlet of the stop valve c (17), and a pressure sensor (31) is connected between the outlet of the stop valve b (16) and the gas inlet of the packing test rectifying tower (1), and the temperature sensor a (18) and the pressure sensor (31) are connected to the PLC (29) to enable temperature signals and the pressure signals to be transmitted to the PLC (29) to be displayed through terminals;
the bottom of the packing test rectifying tower (1) is connected with an organic liquid outlet pipeline, the organic liquid outlet pipeline is respectively connected with an inlet of a liquid pump (8) and an outlet of a liquid stop valve (14), the inlet of the liquid stop valve (14) is connected to a liquid outlet of an organic liquid storage tank (19), the outlet of the liquid pump (8) is respectively connected with an inlet of a stop valve e (13) and an inlet of a hot end of a heat exchanger (9), the outlet of the stop valve e (13) is connected to the liquid inlet of the organic liquid storage tank (19), the outlet of the hot end of the heat exchanger (9) is connected with an inlet of a stop valve f (11), the outlet of the stop valve f (11) is connected to the liquid inlet at the upper part of the packing test rectifying tower (1), a temperature sensor b (10) is arranged between the outlet of the hot end of the heat exchanger (9) and the inlet of the stop valve f (11), and the temperature sensor b (10) is connected with a PLC (29) to realize the transmission of a temperature signal to the PLC (29) through a terminal display;
the top exhaust port of the packing test rectifying tower (1) is connected with an inlet of an exhaust stop valve (3), an outlet of the exhaust stop valve (3) is connected with an inlet of a gas-liquid filter (26), the outlet of the gas-liquid filter (26) is divided into two paths, namely an organic liquid outlet and a nitrogen outlet, the organic liquid outlet of the gas-liquid filter (26) is connected with an inlet of a stop valve i (21), the outlet of the stop valve i (21) is connected with a liquid inlet of an organic liquid storage tank (19), the nitrogen outlet of the gas-liquid filter (26) is respectively connected with an inlet of a stop valve j (22) and an inlet of a stop valve k (23), and the outlet of the stop valve j (22) is respectively connected with an outlet of a blower (24), a hot end inlet of a nitrogen cooling heat exchanger (15) and an outlet of a nitrogen stop valve (25);
the cold end inlet of the nitrogen cooling heat exchanger (15) and the cold end inlet of the heat exchanger (9) are commonly connected with a chilled water outlet of the chilled water unit (12), and the cold end outlet of the nitrogen cooling heat exchanger (15) and the cold end outlet of the heat exchanger (9) are commonly connected with a chilled water return port of the chilled water unit (12) to form a circulating heat exchange pipeline;
the upper part and the lower part of the packing test rectifying tower (1) are respectively connected with a pressure measuring port, the pressure measuring ports at the upper part and the lower part are respectively connected with a stop valve g (2) inlet and a stop valve h (4) inlet, the outlet of the stop valve g (2) and the outlet of the stop valve h (4) are commonly connected to a differential pressure measuring instrument (5), and the differential pressure measuring instrument (5) is connected with a PLC (29) to realize that differential pressure signals output by the differential pressure measuring instrument (5) are transmitted to the PLC (29) to be displayed through a terminal;
the blower (24) is electrically connected with the PLC (29) to realize that the operation and the stop of the blower (24) are controlled by sending a digital quantity switch signal through the PLC (29).
2. A method of operating a liquid distribution testing system in a large packed column according to claim 1, the method comprising the steps of:
1) Before starting the test device, closing all valves, fully soaking the surface of the filler, slowly opening a liquid stop valve (14), enabling organic liquid in an organic liquid storage tank (19) to enter the bottom of the filler test rectifying tower (1) and the inlet of a liquid pump (8), starting the liquid pump (8) and simultaneously opening a stop valve f (11), enabling the organic liquid to enter the top of the filler test rectifying tower (1), spraying the organic liquid from the top of the filler test rectifying tower (1) to the surface of the filler, gradually descending to the bottom of the filler test rectifying tower (1), then conveying the organic liquid back to the top of the filler test rectifying tower (1) by the liquid pump (8), and circulating for 1.5-2 hours until the surface of the filler is fully soaked;
2) After the surface of the filler is fully infiltrated, starting a chilled water unit (12), cooling organic liquid at the outlet of a liquid pump (8) through a heat exchanger (9), slowly opening a stop valve a and a stop valve b (16), and allowing nitrogen from the normal pressure of a pipe network to enter the bottom of a filler test rectifying tower (1) through a nitrogen cooling heat exchanger (15) to serve as ascending gas;
3) Slowly opening an exhaust stop valve (3), enabling gas at the top of the packing test rectifying tower (1) to enter a gas-liquid filter (26), separating liquid in top exhaust, opening a stop valve i (21), returning the liquid separated by the gas-liquid filter (26) to an organic liquid storage tank (19), dividing nitrogen at the outlet of the gas-liquid filter (26) into two paths, opening a stop valve j (22) when the pressure of the gas-liquid filter (26) reaches a preset value, and directly converging nitrogen in an outlet pipeline of a blower (24) with nitrogen in a nitrogen pipe network; when the pressure of the gas-liquid filter (26) is less than a preset value, a stop valve k (23) is opened, and nitrogen is pressurized by a blower (24) and then is converged with the nitrogen of the pipe network;
the temperature sensor b (10) detects the outlet liquid temperature of the liquid pump (8) to be used as a basis for adjusting the heat load of the heat exchanger (9), the heat load adjustment of the heat exchanger (9) is realized by changing the chilled water flow rate of the chilled water unit (12), the differential pressure measuring instrument (5) measures the differential pressure between the top and the bottom of the packing test rectifying tower (1), the packing resistance is determined, the pressure sensor (31) measures the nitrogen inlet pressure at the bottom of the packing test rectifying tower (1) to determine the start and stop of the blower (24), and the temperature sensor a (18) detects the nitrogen temperature at the hot end outlet of the nitrogen cooling heat exchanger (15) to adjust the flow rate of the chilled water unit (12) entering the nitrogen cooling heat exchanger (15).
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