CN214665571U - Precooling system of air separation device - Google Patents

Precooling system of air separation device Download PDF

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Publication number
CN214665571U
CN214665571U CN202022565678.8U CN202022565678U CN214665571U CN 214665571 U CN214665571 U CN 214665571U CN 202022565678 U CN202022565678 U CN 202022565678U CN 214665571 U CN214665571 U CN 214665571U
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China
Prior art keywords
chemical
air
pipeline
unit
air separation
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CN202022565678.8U
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Chinese (zh)
Inventor
阿兰·布里格利亚
曹建伟
李建伟
李志强
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LAir Liquide SA pour lEtude et lExploitation des Procedes Georges Claude
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LAir Liquide SA pour lEtude et lExploitation des Procedes Georges Claude
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Priority to CN202022565678.8U priority Critical patent/CN214665571U/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
    • F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
    • F25J3/04—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air
    • F25J3/04151—Purification and (pre-)cooling of the feed air; recuperative heat-exchange with product streams
    • F25J3/04157—Afterstage cooling and so-called "pre-cooling" of the feed air upstream the air purification unit and main heat exchange line
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
    • F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
    • F25J3/04—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air
    • F25J3/04151—Purification and (pre-)cooling of the feed air; recuperative heat-exchange with product streams
    • F25J3/04163—Hot end purification of the feed air
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
    • F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
    • F25J3/04—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air
    • F25J3/04763—Start-up or control of the process; Details of the apparatus used
    • F25J3/04769—Operation, control and regulation of the process; Instrumentation within the process
    • F25J3/04775—Air purification and pre-cooling
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J2205/00—Processes or apparatus using other separation and/or other processing means
    • F25J2205/30—Processes or apparatus using other separation and/or other processing means using a washing, e.g. "scrubbing" or bubble column for purification purposes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J2205/00—Processes or apparatus using other separation and/or other processing means
    • F25J2205/30—Processes or apparatus using other separation and/or other processing means using a washing, e.g. "scrubbing" or bubble column for purification purposes
    • F25J2205/32—Processes or apparatus using other separation and/or other processing means using a washing, e.g. "scrubbing" or bubble column for purification purposes as direct contact cooling tower to produce a cooled gas stream, e.g. direct contact after cooler [DCAC]
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J2205/00—Processes or apparatus using other separation and/or other processing means
    • F25J2205/50—Processes or apparatus using other separation and/or other processing means using absorption, i.e. with selective solvents or lean oil, heavier CnHm and including generally a regeneration step for the solvent or lean oil
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J2220/00—Processes or apparatus involving steps for the removal of impurities
    • F25J2220/40—Separating high boiling, i.e. less volatile components from air, e.g. CO2, hydrocarbons

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Gas Separation By Absorption (AREA)

Abstract

The utility model discloses an air separation plant's precooling system reaches the purpose of excessive carbon dioxide in the treated air through increasing the chemical preparation contactor in conventional precooling system to solved among the prior art because air separation plant air suction inlet leads to the problem that molecular sieve clarifier entrance carbon dioxide in precooling system low reaches exceeds standard in the environment that carbon dioxide concentration exceeds standard, feasible purifier with normal operating mode carbon dioxide concentration design can deal with the condition that carbon dioxide reaches the peak value.

Description

Precooling system of air separation device
Technical Field
The utility model belongs to the technical field of the air precooling, a air separation plant's precooling system is disclosed.
Background
Pure oxygen and pure nitrogen are one of materials consumed by production enterprises in petrochemical industry, coal chemical industry, metallurgy and the like in a large quantity, and an air separation unit is an important matched device of the enterprises, so that the air separation unit is usually installed in a complex industrial environment, particularly a chemical industrial park where a part of adjacent process units can release a large amount of carbon dioxide sometimes.
The technical process of cryogenic air separation technology is generally as follows: air is filtered by a self-cleaning air filter, enters an air compressor, is compressed to about 5 kilograms, is cooled to about 15 ℃ by an air precooling system, and enters a molecular sieve purifier to remove impurities such as water, carbon dioxide, trace hydrocarbons, nitrous oxide and the like in the air. The purified air is liquefied at low temperature through the processes of air pressurization, expansion or cooling, low-temperature rectification and the like, and then the characteristics of different boiling points of oxygen, nitrogen, argon and the like are utilized to realize the separation of air into oxygen, nitrogen, argon and other inert gases.
Air inevitably contains impurities such as water, carbon dioxide and the like, and at present, each cryogenic air separation technology is provided with a purifier for removing the impurities such as water, carbon dioxide and the like. However, under large-scale and regionalized situations, the devices in the chemical industry park are rich, the emission sources of pollutants such as carbon dioxide are rich, under the action of wind direction and wind power conversion, the pollution sources such as flue gas emitted by boilers, thermoelectric devices and the like are diffused to the vicinity of an air suction inlet of an air separation device, the phenomenon that the content of impurities such as carbon dioxide, hydrocarbons and the like in air entering a purifier is obviously increased often occurs in the chemical industry park, and the impurities such as carbon dioxide and the like are frozen after entering a freezing heat exchange system of the air separation device, so that a heat exchanger or a corresponding pipeline is blocked, and the operation parameters of the device are difficult to adjust, thereby causing the parking situation to occur occasionally.
The processing capacity of a purifier is designed according to the content of carbon dioxide in air of 400-500ppm by the existing plant or air separation technology, although the design value is far higher than the content of impurities such as carbon dioxide and the like in air under normal working conditions, the impurity content at the outlet of the purifier still exceeds the standard when a pollution source diffuses to the area near the air suction inlet of an air separation device, under certain conditions, the concentration of carbon dioxide can reach over 1000ppm within limited time, and the temporary increase breaks through the processing capacity of the carbon dioxide in the purifier, so that the production stop of the plant is caused.
The prior art has the following two methods for dealing with the peak of carbon dioxide: (1) when a carbon dioxide spike is detected, the load on the plant is reduced and the operating cycle of the downstream equipment is adjusted, which also reduces the profitability of the plant; (2) the molecular sieve purifiers are sized large enough to handle high concentrations of carbon dioxide, which affects both capital and operating costs.
In view of the above, a problem to be solved by those skilled in the art is how to design a new pre-cooling system for an air separation device to eliminate the above-mentioned defects and shortcomings in the prior art.
SUMMERY OF THE UTILITY MODEL
Because the air separation device is arranged in a part of chemical industry park which is adjacent to the process unit and can release a large amount of carbon dioxide products or byproducts sometimes, the concentration of carbon dioxide in the air is overlarge, and the carbon dioxide impurities at the air suction inlet of the molecular sieve purifier seriously exceed the standard. The utility model aims at providing an air separation plant's precooling system, through increasing the chemical preparation contactor in conventional precooling system and reach the purpose of excessive carbon dioxide in the treated air to solved among the prior art because air separation plant air suction inlet leads to the problem that molecular sieve purifier suction inlet department carbon dioxide in precooling system low reaches exceeds standard in the environment that carbon dioxide concentration exceeds standard, feasible purifier that accords with the standard design of normal operating mode carbon dioxide concentration can deal with the condition that the carbon dioxide reaches the peak value.
In order to realize the above utility model purpose, the utility model discloses an air separation plant's precooling system, it includes an air cooling tower at least, the air cooling tower is equipped with cooling unit and freezing unit, its characterized in that: the pre-cooling system also includes a chemical contactor and a rinse unit.
Still further, the chemical contactor includes at least a first distributor located at a top of the chemical contactor and a first collector located at a bottom of the chemical contactor.
Still further, the rinse unit includes at least a second dispenser located at a top of the rinse unit and a second collector located at a bottom of the rinse unit.
Still further, the chemical contactor and the flushing unit are disposed within the air cooling tower.
Further, the cooling unit, the freezing unit, the chemical contactor, and the flushing unit are arranged from bottom to top within the air cooling tower.
Still further, the pre-cooling system further comprises a chemical circulation system located outside the air cooling tower.
Furthermore, the chemical circulation system comprises at least one chemical storage tank and a chemical circulation pump.
Furthermore, the chemical circulation system further comprises a first pipeline and a second pipeline, the outlet of the first collector is connected with the inlet of the chemical storage tank through the first pipeline, the outlet of the chemical storage tank is connected with the inlet of the chemical circulation pump, and the outlet of the chemical circulation pump is connected with the first distributor through the second pipeline.
Furthermore, the chemical agent circulating system also comprises a chemical agent waste liquid discharge port which is arranged on the first pipeline.
Furthermore, the chemical circulation system further comprises a chemical supplement inlet, and the chemical supplement inlet is arranged on the chemical storage tank.
Still further, the chemical formulation uses an alkaline solution, the solute of which comprises an alkali metal hydroxide.
Furthermore, the precooling system further comprises a chilled water inlet pipeline, and the chilled water inlet pipeline is connected with the freezing unit.
Still further, the flushing unit further includes a third pipe and a fourth pipe, the chilled water inlet pipe is connected to the second distributor through the third pipe, and the second collector is connected to the chilled water inlet pipe through the fourth pipe.
Compared with the prior art, the utility model provides a technical scheme has following advantage:
a. the air separation device has the capacity of using the existing molecular sieve purifier, and on the premise of meeting the standard design that the concentration of carbon dioxide is within the range of 500ppm under the normal working condition, the chemical agent contactor can absorb excessive carbon dioxide, so that the concentration of the carbon dioxide at the suction inlet of the molecular sieve purifier at the downstream of the precooling system is adjusted to be within the designed capacity, and the load of the whole air separation device can be kept;
b. when the carbon dioxide peak value is detected, the load of the plant is not required to be reduced, the operation period of a downstream device is not required to be adjusted, and the income of the plant is not influenced; compared with the scheme of enlarging the design size of the molecular sieve purifier, the utility model only needs to increase the chemical agent contactor and the flushing unit, and the investment of equipment cost is relatively less;
c. the embedded chemical agent contactor is arranged in the air cooling tower, so that extra factory layout is not occupied; the flushing water of the flushing unit adopts chilled water in a chilled water inlet pipeline and is used for flushing suspended liquid drops carried in rising air, and the chilled water after flushing is collected by a collector at the bottom of the flushing unit and is continuously sent back to the chilled water inlet pipeline to be continuously used as chilled water of the freezing unit;
d. when the concentration of carbon dioxide in the air exceeds the design capacity of the molecular sieve purifier, the chemical agent contactor is used, the chemical agent circulating system is started, and the chemical agent is supplemented and circulated to the chemical agent contactor; when the carbon dioxide in the air does not exceed the standard, the chemical agent circulating system does not need to be started, and the operation is flexible.
Drawings
The advantages and spirit of the present invention can be further understood by the following detailed description of the invention and the accompanying drawings.
Fig. 1 is a schematic structural diagram of a precooling system of an air separation plant provided by the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. It is obvious that the described embodiments are only some of the embodiments of the present invention, and not all of them. Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiment of the present invention, all other embodiments obtained by the person skilled in the art without creative work belong to the protection scope of the present invention.
Furthermore, the terms "first", "second", "third" and "fourth" do not denote any order, quantity, or importance, but rather are used to distinguish one technical feature from another. Similarly, the appearances of the phrases "a" or "an" in various places herein are not necessarily all referring to the same quantity, but rather to the same quantity, and are intended to cover all technical features not previously described. Similarly, unless a specific number of a claim recitation is intended to cover both the singular and the plural, and embodiments may include a single feature or a plurality of features.
The terms "comprising" and "comprises", as used in the claims, should not be construed as being limited to the particular forms set forth herein, but are intended to exclude other elements or steps. They are to be understood as specifying the presence of the stated features, integers, steps and/or components as stated but not to preclude the presence and/or addition of one or more other features, integers, steps or components or groups thereof. Thus, the scope of the expression "a device comprising x and z" should not be limited to devices consisting of only the components x and z. In addition, the scope of the expression "method comprising steps x and z" should not be limited to methods consisting of only these steps.
The precooling system of the air separation plant in the prior art generally consists of an air cooling tower and a water cooling tower, wherein the water cooling tower is used for providing chilled water for the air cooling tower. The conventional air cooling tower is divided into an upper section and a lower section, and comprises a freezing unit and a cooling unit, wherein irregular fillers are respectively filled in the two units to increase the heat exchange surface area of air, freezing water and cooling water, so that the heat exchange efficiency is improved.
The chemical contactor is used for directly contacting air with alkaline chemicals to remove excessive CO2 in the air, and is internally provided with a filler or a tray to facilitate sufficient contact of the air with the alkaline chemicals. The chemical contactor includes at least a first dispenser located at a top of the chemical contactor (a sprayer may be employed) and a first collector located at a bottom of the chemical contactor.
The washing unit is used for directly contacting air and washing water to remove suspended liquid drops (from alkaline chemical agents) entrained in the air, and is internally provided with a filler or a tower plate to facilitate the sufficient contact of the air and the washing water. The rinse unit includes at least a second dispenser located at the top of the rinse unit (a sprayer may be employed) and a second collector located at the bottom of the rinse unit. Preferably, the flushing water uses chilled water of the pre-cooling system, the chilled water is connected with the second distributor through a third pipeline from a chilled water inlet pipeline, the chilled water is collected by a second collector at the bottom of the flushing unit after flushing, and the chilled water is sent back to the chilled water inlet pipeline through a fourth pipeline to be continuously used as the chilled water of the freezing unit.
The chemical agent contactor and the flushing unit can be arranged outside the air cooling tower or in the air cooling tower, and the embedded chemical agent contactor and the embedded flushing unit have the advantage of not occupying extra factory layout.
The chemical agent circulating system is positioned outside the air cooling tower and at least comprises a chemical agent storage tank and a chemical agent circulating pump, the outlet of the first collector is connected with the inlet of the chemical agent storage tank through a first pipeline, the outlet of the chemical agent storage tank is connected with the inlet of the chemical agent circulating pump, the outlet of the chemical agent circulating pump is connected with the first distributor through a second pipeline, and thus a circulating loop is formed. In the operation process, as the chemical is diluted continuously, the chemical needs to be supplemented through a chemical supplement inlet arranged on the chemical storage tank; meanwhile, a chemical waste liquid discharge port is provided on the first pipe to discharge a chemical in which CO2 is dissolved. The chemistry uses an alkaline solution, such as sodium hydroxide (NaOH), potassium hydroxide (KOH), calcium hydroxide (ca (oh)2), or any alkali metal hydroxide. Sodium hydroxide (NaOH) is preferred for operating cost considerations and the chemical reactions occurring within the chemical contactor include 2NaOH + CO2 → Na2CO3+ H2O and/or Na2CO3+ CO2+ H2O → 2NaHCO 3.
The following describes in detail a specific embodiment of the present invention with reference to fig. 1, in this embodiment, the chemical contactor and the flushing unit are disposed in the air cooling tower, and the cooling unit, the freezing unit, the chemical contactor and the flushing unit are arranged from bottom to top.
Compressed to 6 bar absolute by an air separation plant compressor, the air at a temperature of about 100 ℃ is introduced into the air cooling column of the pre-cooling system, the content of CO2 in the air 1 to be treated being about 550 ppm. In which the air is first cooled in the lower cooling unit a of the air cooling tower by direct contact with cooling water 3 to a temperature of about 35 c. Air leaves the lower cooling unit a at a temperature of about 35 ℃ and rises into the refrigeration unit B of the air cooling tower. In the freezing unit B, the air 1 is further in direct contact with the chilled water (injected into the top of the freezing unit B by the chilled water inlet pipe 4) and cooled. The air leaves the refrigeration unit B at a temperature of about 15 c, at which point the CO2 content in air 1 is about 550 ppm. And a hot water outlet 5 is arranged at the bottom of the air cooling tower.
The air continues to rise into the chemical contactor C in the upper middle portion of the air cooling tower, the upper portion of which is injected with a chemical, preferably sodium hydroxide (NaOH) solution. The sodium hydroxide (NaOH) solution was connected to the first sprayer F, the air continuously rising from the freezing unit B removed the excess CO2 in the air by direct contact with the sprayed sodium hydroxide (NaOH) solution, and then the sodium hydroxide (NaOH) solution with dissolved CO2 was collected by the first collector E at the bottom of the chemical contactor C.
An outlet of the first collector E is connected with an inlet of a chemical storage tank 7 through a first pipeline 6, an outlet of the chemical storage tank 7 is connected with an inlet of a chemical circulating pump 10, and an outlet of the chemical circulating pump 10 is connected with the first sprayer F through a second pipeline 11. In the process, as the sodium hydroxide (NaOH) solution is continuously diluted, the sodium hydroxide (NaOH) solution needs to be supplemented through a chemical supplement inlet 8 arranged on the chemical storage tank 7; meanwhile, a chemical waste liquid discharge port 9 is provided on the first pipe 6 to discharge a partially diluted sodium hydroxide (NaOH) solution. The first pipe 6, the chemical storage tank 7, the chemical circulation pump 10, the second pipe 11, the chemical waste liquid discharge port 9, and the chemical replenishment inlet 8 constitute a chemical circulation system.
Excess CO2 in air chemically reacts with sodium hydroxide (NaOH) and dissolves in solution. The air leaves the top of the chemical contactor C at a temperature of about 15℃, at which time the CO2 content in the air is about 500ppm (design capacity).
When the concentration of carbon dioxide in the air exceeds the design capacity of the molecular sieve purifier, a chemical agent contactor is used, the chemical agent circulating system is started, and a chemical agent circulating pump is operated to supplement and circulate chemical agents to the chemical agent contactor; when the concentration of carbon dioxide in the air does not exceed the design capacity of the molecular sieve purifier, a chemical agent contactor is not needed and the chemical agent circulating system is not needed to be started, so that the operation is flexible.
The air leaving the chemical contactor C continues to rise and entrains at least a portion of the droplets of the suspension, which are mainly composed of NaOH, and enters the washing unit D in the upper part of the air cooling tower with the air. The flushing unit D at least comprises a second sprayer H and a second collector G, the second sprayer H is positioned at the top of the flushing unit D, and the second collector G is positioned at the bottom of the flushing unit D. Preferably, the flushing unit uses chilled water injected by a chilled water inlet pipe 4, said chilled water inlet pipe 4 being connected to said second sprayer H through a third pipe 12. After flushing, the chilled water is collected by the second collector G at the bottom of the flushing unit D and sent back to the chilled water inlet pipe 4 to be continuously used as the chilled water of the freezing unit B.
The suspension liquid drops in the chilled water flushing unit are flushed by the chilled water to flow downwards so as to prevent the suspension liquid drops and the treated air 2 from leaving the air cooling tower together to enter a downstream device, such as a molecular sieve purifier, wherein the content of CO2 in the air 2 is reduced from 550ppm to 500ppm, and the normal working condition of the downstream molecular sieve purifier is met.
It should be finally noted that the above-mentioned embodiments are only specific embodiments of the present invention, and are not intended to limit the technical solutions of the present invention, and the protection scope of the present invention is not limited thereto, although the present invention is described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: those skilled in the art can still modify or easily conceive of changes in the technical solutions described in the foregoing embodiments or make equivalent substitutions for some technical features within the technical scope of the present disclosure; such modifications, changes or substitutions do not substantially depart from the spirit and scope of the embodiments of the present invention, and are intended to be included within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims (10)

1. The utility model provides an air separation plant's precooling system, its at least includes an air cooling tower, the air cooling tower is equipped with cooling unit and refrigeration unit, its characterized in that: the precooling system also comprises a chemical agent contactor, a flushing unit and a chemical agent circulating system; the chemical contactor comprises at least a first distributor and a first collector, the first distributor is positioned at the top of the chemical contactor, and the first collector is positioned at the bottom of the chemical contactor; the chemical preparation circulating system at least comprises a chemical preparation storage tank and a chemical preparation circulating pump; the chemical agent circulation system further comprises a first pipeline and a second pipeline; the outlet of the first collector is connected with the inlet of the chemical agent storage tank through a first pipeline, the outlet of the chemical agent storage tank is connected with the inlet of the chemical agent circulating pump, and the outlet of the chemical agent circulating pump is connected with the first distributor through a second pipeline.
2. The pre-cooling system of an air separation plant according to claim 1, characterized in that: the rinse unit includes at least a second dispenser located at a top of the rinse unit and a second collector located at a bottom of the rinse unit.
3. The pre-cooling system of an air separation plant according to claim 1, characterized in that: the chemical contactor and the flushing unit are disposed within the air cooling tower.
4. The pre-cooling system of the air separation plant according to claim 2, characterized in that: the cooling unit, the freezing unit, the chemical agent contactor and the flushing unit are arranged in the air cooling tower from bottom to top.
5. The pre-cooling system of an air separation plant according to claim 1, characterized in that: the chemical circulation system is located outside the air cooling tower.
6. The pre-cooling system of an air separation plant according to claim 1, characterized in that: the chemical preparation circulating system also comprises a chemical preparation waste liquid discharge port which is arranged on the first pipeline.
7. The pre-cooling system of the air separation plant according to claim 6, characterized in that: the chemical preparation circulating system also comprises a chemical preparation supplementing inlet which is arranged on the chemical preparation storage tank.
8. The pre-cooling system of an air separation plant according to claim 1, characterized in that: the chemistry uses an alkaline solution with a solute comprising an alkali metal hydroxide.
9. The pre-cooling system of the air separation plant according to claim 4, characterized in that: the pre-cooling system further comprises a chilled water inlet pipeline, and the chilled water inlet pipeline is connected with the freezing unit.
10. The pre-cooling system for an air separation plant according to claim 9, characterized in that: the flushing unit further comprises a third pipeline and a fourth pipeline, the chilled water inlet pipeline is connected with the second distributor through the third pipeline, and the second collector is connected with the chilled water inlet pipeline through the fourth pipeline.
CN202022565678.8U 2020-11-09 2020-11-09 Precooling system of air separation device Active CN214665571U (en)

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