CN111530113A - 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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- CN111530113A CN111530113A CN202010376588.6A CN202010376588A CN111530113A CN 111530113 A CN111530113 A CN 111530113A CN 202010376588 A CN202010376588 A CN 202010376588A CN 111530113 A CN111530113 A CN 111530113A
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- 239000007788 liquid Substances 0.000 title claims abstract description 233
- 238000012360 testing method Methods 0.000 title claims abstract description 87
- 238000000034 method Methods 0.000 title claims abstract description 10
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 145
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 72
- 238000012856 packing Methods 0.000 claims abstract description 53
- 238000009825 accumulation Methods 0.000 claims abstract description 12
- 239000000945 filler Substances 0.000 claims description 26
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 25
- 238000001816 cooling Methods 0.000 claims description 21
- 238000000926 separation method Methods 0.000 claims description 20
- 239000007789 gas Substances 0.000 claims description 19
- 238000009530 blood pressure measurement Methods 0.000 claims description 4
- 230000001174 ascending effect Effects 0.000 claims description 3
- 238000005507 spraying Methods 0.000 claims description 3
- 230000008676 import Effects 0.000 claims 2
- 230000008054 signal transmission Effects 0.000 claims 1
- 241000521257 Hydrops Species 0.000 description 6
- 206010030113 Oedema Diseases 0.000 description 6
- 238000004088 simulation Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
- 229910001873 dinitrogen Inorganic materials 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
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- 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
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- 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 packed tower and an operation method thereof, and the liquid distribution test system comprises a packed test rectifying tower, wherein a liquid accumulation groove is arranged at the bottom in the packed test rectifying tower, a plurality of check liquid accumulation unit grids are arranged above the liquid accumulation groove of the packed test rectifying tower and are used for collecting liquid descending from different sections of packing, and the descending liquid distribution condition of the working condition pressure and the gas-liquid load condition of the rectifying tower is simulated by using nitrogen and an organic working medium.
Description
Technical Field
The invention relates to a liquid distribution test system and an operation method, in particular to a liquid distribution test system in a large-scale packed tower and an operation method, and belongs to the field of industrial rectification.
Background
At present, industrial rectification equipment is developing towards large-scale, therefore, the diameter of a rectification tower is continuously increased, the diameter of the rectification tower is known to reach the magnitude of 10m, but the bias flow severity of descending liquid in the tower is rapidly increased along with the increase of the diameter of the rectification tower, the current published data shows that most of rectification packing descending liquid distribution test devices adopt air and water to simulate a rectification two-phase medium, certain inconsistency exists between the occurrence of fluid viscosity, surface tension and the like and the actual rectification condition, in addition, the distribution of the descending liquid at the bottom of a packing of the rectification tower is basically observed by naked eyes at present, and the distribution condition of the descending liquid on the radial section of the packing cannot be accurately quantified.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a liquid distribution test system in a large packed tower, which has the technical characteristics that nitrogen and organic liquid can be used for simulating the distribution condition of descending liquid under the conditions of working condition pressure of the rectifying tower and gas-liquid load and the like.
It is another object of the present invention to provide a method of operating a liquid distribution test system in a large packed column.
In order to achieve the purpose, the invention is realized by the following technical scheme:
the liquid distribution test system in the large-scale packing tower comprises a packing test rectifying tower, wherein a liquid accumulation groove is formed in the bottom of the packing test rectifying tower, and a plurality of square liquid accumulation unit grids are arranged above the liquid accumulation groove and used for collecting liquid descending from different sections of packing.
As an improvement, the gaps on the circumference of the inner wall of the packed test rectification column are removed, and 112 square unit cells are arranged in total.
As an improvement, square cell below is connected with the gas-liquid separation post, the gas-liquid separation post is built-in to be filled with the gas-liquid separation filter screen and comes out in order to descend the gas separation in the liquid, 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 through gas-liquid separation filter screen gas-liquid separation falls into the liquid collection post.
As an improvement, the device also comprises a nitrogen pipe network with a stop valve a and an outlet pipeline with a blower, wherein a branch of the nitrogen pipe network converges with the outlet pipeline to realize convergence of the internal normal pressure nitrogen and the nitrogen, the converged nitrogen enters a hot end inlet of a nitrogen cooling heat exchanger, hot end outlets of the nitrogen cooling heat exchanger are respectively connected with an inlet of a stop valve b and an inlet of a stop valve c, an outlet of the stop valve b is connected with a gas inlet of a packing test rectifying tower, an outlet of the stop valve c is connected with a gas inlet of an organic liquid storage tank, a temperature sensor a is connected between the inlet of the stop valve b and the inlet of the stop valve c, a pressure sensor is connected between the outlet of the stop valve b and the gas inlet of the packing test rectifying tower, and the temperature sensor a and the pressure sensor are both.
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 with a liquid outlet of a 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 with the liquid inlet of the liquid storage tank, the heat exchanger hot end outlet is connected with a stop valve f inlet, the stop valve f outlet is connected with 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 transmit a temperature signal to the PLC for terminal display;
as an improvement, an exhaust stop valve inlet is connected to an exhaust outlet at the top of the packing test rectifying tower, an outlet of the exhaust stop valve is connected with an inlet of a gas-liquid filter, an 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 an inlet of a stop valve i, the outlet of the stop valve i is connected with a liquid inlet of an organic liquid storage tank, the nitrogen outlet of the gas-liquid filter is connected with an inlet of a stop valve j and an inlet of a stop valve k, and the outlet of the stop valve j is connected to an.
As an improvement, the cold-end inlet of the nitrogen cooling heat exchanger and the cold-end inlet of the heat exchanger are connected with a chilled water outlet of the chilled water unit together, and the cold-end outlet of the nitrogen cooling heat exchanger and the cold-end outlet of the heat exchanger are connected with a chilled water return port of the chilled water unit together 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 measurement port, the pressure measurement 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 jointly connected onto a differential pressure measuring instrument, and the differential pressure measuring instrument is connected with a PLC (programmable logic controller) so as to transmit a differential pressure signal output by the differential pressure measuring instrument to the PLC and display the differential pressure signal through a terminal.
As an improvement, the blower is electrically connected with the PLC to realize the control of the operation and the stop of the blower by sending digital switch signals through the PLC.
A method for operating a liquid distribution test system in a 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 a filler test rectifying tower and an inlet of a liquid pump, starting the liquid pump and simultaneously opening a stop valve f, enabling the organic liquid to enter the top of the filler test rectifying tower, spraying the organic liquid onto the surface of the filler from the top of the filler test rectifying tower, 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 through the 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 soaked, 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 a pipe network under normal pressure to enter the bottom of a filler test rectifying tower after passing through a 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 the 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, opening a stop valve j when the pressure of the gas-liquid filter reaches a preset value, and directly converging the nitrogen in an outlet pipeline of a blower with the nitrogen in a nitrogen pipeline network; when the pressure of the gas-liquid filter is lower than a preset value, opening a stop valve k, and converging nitrogen with the nitrogen of the pipe network after the nitrogen is pressurized by a blower;
the temperature sensor b detects the liquid outlet liquid temperature of the liquid pump to serve as the basis for adjusting the heat load of the heat exchanger, the heat load of the heat exchanger is adjusted by changing the flow rate of chilled water of the chilled water unit, the pressure difference measuring instrument measures the pressure difference between the top and the bottom of the packing test rectifying tower to determine the resistance of the packing, the pressure sensor measures the pressure of a 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 of the.
Has the advantages that: utilize nitrogen gas and organic liquid simulation rectifying column operating mode pressure and descending liquid distribution condition under the gas-liquid load condition, choose for use and have similar surface tension's organic liquid with liquid air, the actual flow state of liquid air in can better simulation rectifying column, bottom hydrops groove upper portion is provided with a plurality of square hydrops unit, divide into a plurality of square cell with whole rectifying column cross-section, every square cell below is connected with the hydrops pipe, be used for collecting the liquid that descends from the different positions of filler, and obtain the descending liquid flow rate of filler in different positions through liquid level counting, thereby obtain the distribution characteristic of descending liquid at the different positions of filler.
Drawings
FIG. 1 is a schematic diagram of a test system of the present invention.
FIG. 2 is a cross-sectional view taken at A-A of the present invention.
FIG. 3 is a cross-sectional view taken at B-B of the present invention.
FIG. 4 is a cross-sectional view taken at D-D of the present invention.
Detailed Description
The present invention will be further described with reference to the drawings attached to the specification, but the present invention is not limited to the following examples.
As shown in fig. 1-4, a specific embodiment of a liquid distribution test system in a large packed tower is shown, and the liquid distribution test system in the large packed tower comprises a packed test rectifying tower 1, wherein a liquid accumulation groove is arranged at the bottom in the packed test rectifying tower 1, and a plurality of liquid accumulation grid unit grids 27 are arranged above the liquid accumulation groove and are used for collecting liquid descending from different sections of the packing; removing the gaps on the circumference of the inner wall of the packed test rectifying tower 1, and totally setting 112 square unit grids 27; a gas-liquid separation column 7 is connected below the square 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 and is connected with a PLC29, liquid subjected to gas-liquid separation by the gas-liquid separation filter screen 28 falls into the liquid collection column 6, descending liquid load and descending liquid flow rate of different sections of the filler are obtained by measuring liquid level change of the liquid collection column 6, and liquid level signals of the liquid level sensor are transmitted to a PLC29 to be displayed through a terminal; a plurality of check hydrops units 27 are arranged on the upper portion of a hydrops groove at the bottom of the packing test rectifying tower 1, the cross section of the whole rectifying tower is divided into a plurality of square unit grids, a hydrops pipe (a liquid collecting column 6) is connected below each square unit grid and used for collecting liquid falling from different positions of the packing, the falling liquid flow rate of the packing at different positions is obtained through liquid level counting, and therefore the distribution characteristics of the falling liquid at different positions of the packing are obtained.
The device is characterized by further comprising a nitrogen pipe network with a stop valve a25 and an outlet pipeline with a blower 24, branches of the nitrogen pipe network and the outlet pipeline are converged to realize the convergence of the internal normal-pressure nitrogen and the nitrogen, the converged nitrogen enters a hot end inlet of a 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, an outlet of a stop valve b16 is connected with a gas inlet of a packing test rectifying tower 1, an outlet of the stop valve c17 is connected with a gas inlet of an 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 a stop valve c17, a pressure sensor 31 is connected between an outlet of the stop valve b16 and the gas inlet of the packing test, The pressure signal is transmitted to the PLC29 to be displayed through a terminal;
the bottom of the packed 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, an inlet of the liquid stop valve 14 is connected with a liquid outlet of a liquid storage tank 19, an outlet of the liquid pump 8 is respectively connected with an inlet of a stop valve e13 and a hot end inlet of a heat exchanger 9, an outlet of the stop valve e13 is connected with the liquid inlet of the liquid storage tank 19, a hot end outlet of the heat exchanger 9 is connected with an inlet of a stop valve f11, an outlet of the stop valve f11 is connected with the liquid inlet of the upper part of the packed test rectifying tower 1, a temperature sensor b10 is arranged between the hot end outlet of the heat exchanger 9 and the inlet of the stop valve 11, and the temperature sensor b10 is connected;
an air outlet at the top 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 the inlet of a stop valve i21, the outlet of the stop valve i21 is connected with the liquid inlet of the machine liquid storage tank 19, the nitrogen outlet of the gas-liquid filter 26 is respectively connected with the inlet of a stop valve j22 and the inlet of a stop valve k23, the outlet of the stop valve j22 is respectively connected with the outlet of the blower 24, the inlet of the hot end of the nitrogen cooling heat exchanger 15 and the outlet of the nitrogen stop valve 25, the descending liquid distribution condition under the working condition pressure and the gas-liquid load condition of the rectifying tower is simulated by using nitrogen and organic liquid, the organic liquid with the surface tension similar to that of the liquid air is selected, so that the actual flowing state of the liquid air in the rectifying tower can be well 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 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.
As an improved embodiment mode, 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 of the upper part and the lower part are respectively connected with an inlet of a stop valve g2 and an inlet of a stop valve h4, an outlet of the stop valve g2 and an outlet of the stop valve h4 are jointly connected to a differential pressure measuring instrument 5, and the differential pressure measuring instrument 5 is connected with a PLC29 to realize that a differential pressure signal output by the differential pressure measuring instrument 5 is transmitted to the PLC29 to be displayed through a terminal.
As a modified embodiment mode, the blower 24 is electrically connected with the PLC29 to realize the control of the operation and the stop of the blower 24 through the digital switch signal sent by the PLC 29.
A method of operating a liquid distribution test system in a large packed column, the method comprising the steps of:
1) before starting the test device, closing all valves, fully infiltrating the surface of the filler, slowly opening the liquid stop valve 14, enabling the organic liquid in the organic liquid storage tank 19 to enter the bottom of the filler test rectifying tower 1 and the inlet of the liquid pump 8, starting the liquid pump 8 and simultaneously opening the stop valve f11, enabling the organic liquid to enter the top of the filler test rectifying tower 1, spraying the organic liquid onto the surface of the filler from the top of the filler test rectifying tower 1, 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 infiltrated;
2) after the surface of the filler is fully soaked, 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 a pipe network under normal pressure to enter the bottom of a filler test rectifying tower 1 after passing through a nitrogen cooling heat exchanger 15 to serve as ascending gas;
3) slowly opening an exhaust stop valve 3, enabling the gas at the top of the packing test rectifying tower 1 to enter a gas-liquid filter 26, separating liquid in the top exhaust gas, 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 the outlet of the gas-liquid filter 26 into two paths, opening a stop valve j22 when the pressure of the gas-liquid filter 26 reaches a preset value, and directly converging the nitrogen in an outlet pipeline of an air blower 24 with the nitrogen in a nitrogen pipeline network; when the pressure of the gas-liquid filter 26 is not equal to the preset value, the stop valve k23 is opened, and the nitrogen is pressurized by the blower 24 and then converged with the nitrogen in the pipe network;
the temperature sensor b10 detects the temperature of liquid at the outlet of the liquid pump 8 to serve 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 of the chilled water unit 12, the pressure difference measuring instrument 5 measures the pressure difference between the top and the bottom of the packing test rectifying tower 1 to determine the resistance of the packing, the pressure sensor 31 measures the pressure of a 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 nitrogen at the outlet of the hot end of the nitrogen cooling heat exchanger 15 to adjust the flow rate of the chilled water of the.
Finally, it should be noted that the present invention is not limited to the above embodiments, and many variations are possible. All modifications which can be derived or suggested by a person skilled in the art from the disclosure of the present invention are to be considered within the scope of the invention.
Claims (10)
1. A liquid distribution test system in a large-scale packed tower is characterized in that: the packing test rectification tower comprises a packing test rectification tower (1), wherein a liquid accumulation groove is formed in the bottom of the packing test rectification tower (1), and a plurality of square liquid accumulation unit grids (27) are arranged above the liquid accumulation groove and used for collecting liquid descending from different sections of packing.
2. The liquid distribution test system in the large packed tower according to claim 1, wherein: a total of 112 square cells (27) were arranged by removing the gaps on the circumference of the inner wall of the packed test rectification column (1).
3. The liquid distribution test system in the large packed tower according to claim 1 or 2, wherein: the square cell (27) below is connected with gas-liquid separation post (7), gas-liquid separation filter screen (28) in order to come out the gas separation in the descending liquid is filled in gas-liquid separation post (7), gas-liquid separation post (7) lower extreme is connected with liquid collection post (6), be equipped with level sensor in liquid collection post (6), level sensor is connected with PLC (29), and liquid through gas-liquid separation filter screen (28) gas-liquid separation falls into liquid collection post (6).
4. The liquid distribution test system in the large packed tower according to claim 3, wherein: the device is characterized by further comprising a nitrogen pipe network with a stop valve a (25) and an outlet pipeline with an air blower (24), wherein a branch of the nitrogen pipe network and the outlet pipeline are converged to realize convergence of internal normal pressure nitrogen and nitrogen, the converged nitrogen enters a hot end inlet of a nitrogen cooling heat exchanger (15), a hot end outlet of the nitrogen cooling heat exchanger (15) is respectively connected with an inlet of a stop valve b (16) and an inlet of a stop valve c (17), an outlet of the stop valve b (16) is connected with a gas inlet of a packing test rectifying tower (1), an 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), a pressure sensor (31) is connected between the outlet of the stop valve b (16) and the gas inlet of the packing test rectifying, The pressure sensors (31) are connected to the PLC (29) so that temperature signals and pressure signals can be transmitted to the PLC (29) and displayed through a terminal.
5. The liquid distribution test system in the large packed tower according to claim 4, wherein: the bottom of the packing test rectifying tower (1) is connected with an organic liquid outlet pipeline which 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 with the liquid outlet of the machine 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 the hot end of the heat exchanger (9), the outlet of the stop valve e (13) is connected with the liquid inlet of the machine liquid storage tank (19), the hot end outlet of the heat exchanger (9) is connected with the inlet of a stop valve f (11), the outlet of the stop valve f (11) is connected with 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 (11), the temperature sensor b (10) is connected with the PLC (29) to transmit a temperature signal to the PLC (29) for displaying through a terminal.
6. The liquid distribution test system in the large packed tower according to claim 4 or 5, wherein: an exhaust stop valve (3) inlet is connected to an exhaust outlet at the top of the packing test rectifying tower (1), 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 which are respectively 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), an outlet of the stop valve i (21) 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 j (22) and an inlet of a stop valve k (23), and an outlet of the stop valve j (22) is respectively connected to an outlet of an air blower (24), an.
7. The liquid distribution test system in the large packed tower according to claim 5, wherein: the cold end inlet of the nitrogen cooling heat exchanger (15) and the cold end inlet of the heat exchanger (9) are connected with a chilled water outlet of the chilled water unit (12) together, and the cold end outlet of the nitrogen cooling heat exchanger (15) and the cold end outlet of the heat exchanger (9) are connected with a chilled water return port of the chilled water unit (12) together to form a circulating heat exchange pipeline.
8. The liquid distribution test system in the large packed tower according to claim 5 or 7, wherein: the packing test rectifying column (1) upper portion and lower part are connected with the pressure measurement mouth respectively, and the pressure measurement mouth of upper portion and lower part is connected with stop valve g (2) import and stop valve h (4) import respectively, stop valve g (2) export and stop valve h (4) export are connected on differential pressure measuring apparatu (5) jointly, differential pressure measuring apparatu (5) are connected with PLC (29) and pass through the terminal demonstration in order to realize differential pressure signal transmission of differential pressure measuring apparatu (5) output to PLC (29).
9. The liquid distribution test system in the large packed tower according to claim 4, wherein: the blower (24) is electrically connected with the PLC (29) to realize the control of the operation and the stop of the blower (24) by sending digital quantity switching signals through the PLC (29).
10. A method for operating a liquid distribution test system in a 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 packing firstly, slowly opening a liquid stop valve (14), enabling organic liquid in an organic liquid storage tank (19) to enter the bottom of a packing test rectifying tower (1) and an 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 packing test rectifying tower (1), spraying the organic liquid onto the surface of the packing from the top of the packing test rectifying tower (1), gradually descending to the bottom of the packing test rectifying tower (1), then conveying the organic liquid back to the top of the packing test rectifying tower (1) by the liquid pump (8), and circulating for 1.5-2 hours until the surface of the packing is fully infiltrated;
2) after the surface of the filler is fully soaked, a chilled water unit (12) is started, organic liquid is cooled at the outlet of a liquid pump (8) through a heat exchanger (9), a stop valve a (25) and a stop valve b (16) are slowly opened, and normal-pressure nitrogen from a pipe network enters the bottom of a filler test rectifying tower (1) after passing through a nitrogen cooling heat exchanger (15) and is used as ascending gas;
3) slowly opening an exhaust stop valve (3), enabling gas at the top of a 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 an outlet of the gas-liquid filter (26) into two paths, and opening a stop valve j (22) when the pressure of the gas-liquid filter (26) reaches a preset value, so that the nitrogen in an outlet pipeline of an air blower (24) is directly converged with the nitrogen in a nitrogen pipeline network; when the pressure of the gas-liquid filter (26) is lower than a preset value, a stop valve k (23) is opened, and nitrogen is pressurized by an air blower (24) and then converged with the nitrogen of the pipe network;
the temperature sensor b (10) detects the temperature of liquid at the outlet of the liquid pump (8) to serve as the basis for adjusting the heat load of the heat exchanger (9), the heat load of the heat exchanger (9) is adjusted by changing the flow of chilled water of the chilled water unit (12), the pressure difference between the top and the bottom of the packing test rectifying tower (1) is measured by the pressure difference measuring instrument (5), the resistance of the packing is determined, the pressure sensor (31) measures the pressure of a 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 nitrogen at the outlet of the hot end of the nitrogen cooling heat exchanger (15) to adjust the flow of the chilled water unit (12) entering the.
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