CN202328999U - Air separating equipment with quick start - Google Patents

Air separating equipment with quick start Download PDF

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Publication number
CN202328999U
CN202328999U CN2011205022102U CN201120502210U CN202328999U CN 202328999 U CN202328999 U CN 202328999U CN 2011205022102 U CN2011205022102 U CN 2011205022102U CN 201120502210 U CN201120502210 U CN 201120502210U CN 202328999 U CN202328999 U CN 202328999U
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CN
China
Prior art keywords
air
air separation
pressure column
pipeline
tower
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
CN2011205022102U
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Chinese (zh)
Inventor
金庆丰
李建伟
刘瑞
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Air Liquide Hangzhou Co Ltd
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Air Liquide Hangzhou Co Ltd
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Publication date
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Priority to CN2011205022102U priority Critical patent/CN202328999U/en
Application granted granted Critical
Publication of CN202328999U publication Critical patent/CN202328999U/en
Anticipated expiration legal-status Critical
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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
    • F25J3/04248—Generation of cold for compensating heat leaks or liquid production, e.g. by Joule-Thompson expansion
    • F25J3/04284—Generation of cold for compensating heat leaks or liquid production, e.g. by Joule-Thompson expansion using internal refrigeration by open-loop gas work expansion, e.g. of intermediate or oxygen enriched (waste-)streams
    • F25J3/0429—Generation of cold for compensating heat leaks or liquid production, e.g. by Joule-Thompson expansion using internal refrigeration by open-loop gas work expansion, e.g. of intermediate or oxygen enriched (waste-)streams of feed air, e.g. used as waste or product air or expanded into an auxiliary column
    • F25J3/04303—Lachmann expansion, i.e. expanded into oxygen producing or low pressure column
    • 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
    • F25J3/04006—Providing pressurised feed air or process streams within or from the air fractionation unit
    • F25J3/04078—Providing pressurised feed air or process streams within or from the air fractionation unit providing pressurized products by liquid compression and vaporisation with cold recovery, i.e. so-called internal compression
    • F25J3/04084—Providing pressurised feed air or process streams within or from the air fractionation unit providing pressurized products by liquid compression and vaporisation with cold recovery, i.e. so-called internal compression of nitrogen
    • 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
    • F25J3/04006—Providing pressurised feed air or process streams within or from the air fractionation unit
    • F25J3/04078—Providing pressurised feed air or process streams within or from the air fractionation unit providing pressurized products by liquid compression and vaporisation with cold recovery, i.e. so-called internal compression
    • F25J3/0409—Providing pressurised feed air or process streams within or from the air fractionation unit providing pressurized products by liquid compression and vaporisation with cold recovery, i.e. so-called internal compression of oxygen
    • 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
    • F25J3/04406—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 using a dual pressure main column system
    • F25J3/04412—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 using a dual pressure main column system in a classical double column flowsheet, i.e. with thermal coupling by a main reboiler-condenser in the bottom of low pressure respectively top of high pressure column
    • 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
    • F25J3/04812—Different modes, i.e. "runs" of operation
    • F25J3/04818—Start-up of the process
    • 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
    • F25J2245/00—Processes or apparatus involving steps for recycling of process streams
    • F25J2245/02—Recycle of a stream in general, e.g. a by-pass stream
    • 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
    • F25J2245/00—Processes or apparatus involving steps for recycling of process streams
    • F25J2245/40—Processes or apparatus involving steps for recycling of process streams the recycled stream being air

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • Emergency Medicine (AREA)
  • Separation By Low-Temperature Treatments (AREA)

Abstract

The utility model relates to an air separating equipment. The air separating equipment is used for separating the air through low temperature fractionation and comprises an air compressor, a purification system, a heat exchanging system, an expansion machine and a double-tower system, wherein the air compressor, the purification system, the heat exchanging system, the expansion machine and the double-tower system are connected with each other by pipelines in sequence; the double-tower system comprises a middle pressure tower, a low pressure tower and a condensing evaporator; the middle pressure tower is positioned at the lower part of the double-tower system; the low pressure tower is positioned at the upper part of the double-tower system; the condensing evaporator is positioned between the two towers; the air separating equipment also comprises a bypass pipeline and/or a liquid-enriched pipeline; the bypass pipeline is connected to a waste nitrogen pipeline at a cold end of the heat exchanging system from an outlet end of the expansion machine; and the liquid-enriched pipeline is connected to the condensing evaporator from the bottom of the middle pressure tower.

Description

The air separation equipment that band starts fast
Technical field
The utility model relates to a kind of air separation equipment (air separation plant), relates more specifically to a kind of cryogenic rectification type air separation equipment that can accelerate toggle speed.
Background technology
Air separation is meant from air separates and produces components such as oxygen, nitrogen and argon; At present mainly adopt the cryogenic rectification partition method because compare with other air separating methods such as absorption method, membrane separation processes that its production cost is low, technology maturation and be suitable for large-scale industrial production.Cryogenic rectification type air separation plant generally includes dynamical system (mainly being air compressor), cleaning system, refrigeration system (mainly being decompressor), heat-exchange system, distillation system and product delivery system etc.; Wherein distillation system generally adopts two stage pressure rectifying modes; Mainly constitute, be known as " double tower system " by lower pressure column, medium pressure column and the condenser/evaporator between them.
The problem that existing cryogenic rectification type air separation plant exists is; Air separation plant is needing the long time when normal temperature carries out hot starting, hot start; This be because air separation plant when starting temperature higher relatively and cold is not enough; Make air separation plant all slow to some extent aspect the setting up of self cooling, fluid accumulation and rectifying operating mode, thereby prolonged start-up time.Yet, but product-free output of a consumed energy in this start-up course, like this start-up time the long economic benefit that will influence air separation plant.
The utility model content
The utility model is intended to solve the aforementioned problems in the prior and a kind of air separation equipment that can accelerate toggle speed is provided, thereby accelerates the product output after air separation plant is driven, and improves the economic benefit of air separation plant.
According to the utility model; A kind of air separation equipment through the cryogenic rectification separation of air comprises air compressor, cleaning system, heat-exchange system, decompressor and the double tower system that connects in order through pipeline; Said double tower system comprises the medium pressure column in the bottom, superposed lower pressure column and the condenser/evaporator between these two towers, and the useless nitrogen pipeline that is connected with the top of said lower pressure column extends through said heat-exchange system from the cold junction of said heat-exchange system.Said air separation equipment also comprises from the port of export of said decompressor and is connected to the bypass line of said useless nitrogen pipeline at the cold junction of said heat-exchange system, and/or is connected to the rich solution pipeline of said condenser/evaporator from the bottom of said medium pressure column.
Air separation equipment according to the utility model can strengthen local heat exchange or optimize local rectification effect with easy setting and simple structure in air separation plant; Thereby shorten the start-up time of air separation plant at low cost; This can accelerate the product output after air separation plant is driven and save energy; Can also reduce the down time of air separation plant, improve the reliability and the economic benefit of air separation plant thus.
Description of drawings
The accompanying drawing that comprises in this manual and constitute the part of this specification illustrates the exemplary embodiment of the utility model, and is used to explain the principle of the utility model with explanation, in the accompanying drawings:
Fig. 1 is the structural representation according to the air separation equipment of the utility model one embodiment.
The specific embodiment
Describe an exemplary embodiment of the utility model below in detail with reference to Fig. 1.
Air separation equipment according to this embodiment mainly adopts double tower system to come air is carried out cryogenic rectification; As shown in Figure 1; This double tower system comprises the medium pressure column 51 and superposed lower pressure column 53 that is positioned at the bottom, and is arranged on the condenser/evaporator 52 between medium pressure column and the lower pressure column.
When air separation plant was worked, as shown in Figure 1, the raw air of importing from the input of air separation plant at first was compressed in main compressor 1, gets into cleaning system then.In cleaning system, air precooling in forecooler 21 is earlier flow through clarifier 22 then to remove impurity such as airborne moisture, carbon dioxide.The air that comes out from clarifier 22 is divided into a, b, c three parts.A part is being pressurized the hot junction of delivering to heat exchanger 3 after machine 6 further is compressed to higher pressure, and the bottom of medium pressure column 51 is delivered in cooling always and leave from the cold junction of heat exchanger 3 in heat exchanger 3 then again.The b part is directly delivered to cooling in the heat exchanger 3, also leads to the bottom of medium pressure column 51 then.The c part is delivered to supercharger 42 sides of a booster expansion machine earlier by further compression, gets into heat exchanger 3 then; After in heat exchanger 3, carrying out the part cooling, draw and deliver to decompressor 41 from the middle and upper part of heat exchanger 3 and expand to produce the required cold of air separation equipment, cryogenic rectification is carried out at the middle part that leads to lower pressure column 53 again.Wherein, decompressor 41 and supercharger 42 are coaxial connects and drives supercharger 42.
Explanation to compression of air, cooling and expansion system is in order to provide an example according to the air separation equipment of the utility model above; But the utility model also can be applied to other any suitable air compression, cooling and expansion system configuration.
The cooling air that gets into medium pressure column 51 bottoms flows through medium pressure column 51 from bottom to top, with in the medium pressure column from top to bottom flowing liquid meet and carry out the mass transfer heat exchange, finally obtain purer gaseous nitrogen at the top of medium pressure column 51.This gaseous nitrogen is cooled into liquid in the condensation side of condenser/evaporator 52, and a part can be used as liquid nitrogen product output or pressurizes and deliver to liquid nitrogen pump 11 and is gasificated into high-pressure gaseous nitrogen in the heat exchanger 3, and another part flows down in medium pressure column 51 as phegma.Phegma carries out the caloic exchange with the gas that rises in medium pressure column, obtain containing the more oxygen-rich liquid of oxygen in the medium pressure column bottom at last.On the other hand, the expanded air that gets into from lower pressure column 53 middle parts carries out rectifying and carries and heating up in a steamer lower pressure column 53, can obtain purer liquid oxygen in the bottom of lower pressure column at last, and obtains useless nitrogen at the top of lower pressure column.Wherein, liquid oxygen can carry out heat exchange and be evaporated to gaseous oxygen in the evaporation side of condenser/evaporator 52 and the gaseous nitrogen at medium pressure column top, and form that also can the liquid oxygen product is drawn or with liquid oxygen pump 10 pressurizations and deliver to and be gasificated into high-pressure gaseous oxygen in the heat exchanger 3.The useless nitrogen that obtains at the top of lower pressure column 53 can be delivered to the cold junction of heat exchanger 3 through useless nitrogen pipeline 7, and the air that passes to get into hot junction from heat exchanger 3 from heat exchanger 3 carries out heat exchange and cools off these air.
But when air separation equipment carried out hot starting, hot start, the temperature of each several part was higher, and the cold that is derived from useless nitrogen pipeline is not enough, and entire equipment needs work a period of time to cool down gradually just can set up the required thermal balance of ordinary production.In order to make equipment reach this thermal balance as early as possible, as shown in Figure 1 in the utility model, draw the bypass line 8 that a cold junction at heat exchanger 3 is connected to useless nitrogen pipeline 7 from the port of export of decompressor 41.Like this; In the device start stage, can a part of cold that decompressor 41 produces directly be imported in the heat exchanger 3, strengthen the local heat exchange here; Thereby foundation and the saving of accelerating the heat exchange operating mode of heat exchanger 3 reach the required time of normal heat balance, that is have accelerated the toggle speed of air separation plant.
On the other hand, condenser/evaporator 52 is the parts of difficult cooling in the air separation plant start-up course normally, often have only the cold air physical efficiency of few part to pass through from it, and this causes its hydrops time longer, has delayed the speed of ordinary production.For this reason; In the utility model; Also can draw a rich solution pipeline 9 that is connected to condenser/evaporator 52, the oxygen-rich liquid of medium pressure column bottom is delivered to the low-pressure side in the condenser/evaporator 52, utilize the cold of oxygen-rich liquid to accelerate the cooling of condenser/evaporator in the air separation plant start-up course from the bottom of medium pressure column 51; Thereby shorten its hydrops time, reach the ordinary production state as early as possible.
The above-mentioned configuration of the utility model can be applicable to various cryogenic rectification type air separation equipments; As long as this air separation plant has above-mentioned heat exchanger (main heat exchanger) and/or condenser/evaporator (main condenser evaporimeter); Accordingly, can be the toggle speed that above-mentioned bypass line 8 of air separation plant outfit and/or rich solution pipeline 9 are accelerated air separation plant.
Thus; The utility model is through strengthening local heat exchange or optimize local rectification effect with easy setting and simple structure in air separation plant; Shortened the start-up time of air separation plant at low cost; This can accelerate the product output after air separation plant is driven and save energy, and can also reduce the down time of air separation plant, improves the reliability and the economic benefit of air separation plant thus.
To those skilled in the art, it is exemplary that this specification and disclosed example thereof should be considered to, and under the situation of scope that does not break away from the utility model or spirit, can make various modifications and modification to preceding text the disclosed embodiments.

Claims (2)

1. air separation equipment through the cryogenic rectification separation of air; Comprise the air compressor, cleaning system, heat-exchange system, decompressor and the double tower system that connect in order through pipeline; Said double tower system comprises the medium pressure column in the bottom, superposed lower pressure column and the condenser/evaporator between these two towers; The useless nitrogen pipeline that is connected with the top of said lower pressure column extends through said heat-exchange system from the cold junction of said heat-exchange system; It is characterized in that said air separation equipment also comprises the bypass line that is connected to said useless nitrogen pipeline from the port of export of said decompressor at the cold junction of said heat-exchange system.
2. air separation equipment according to claim 1 is characterized in that, also comprises the rich solution pipeline that is connected to said condenser/evaporator from the bottom of said medium pressure column.
CN2011205022102U 2011-12-01 2011-12-01 Air separating equipment with quick start Expired - Lifetime CN202328999U (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106091575A (en) * 2016-05-31 2016-11-09 浙江智海化工设备工程有限公司 A kind of expanded air bypass amount being matched in external compression space division reduces device and reduction method
CN109387031A (en) * 2017-08-03 2019-02-26 乔治洛德方法研究和开发液化空气有限公司 Device and method for separating air by low temperature distillation
CN111542724A (en) * 2017-11-29 2020-08-14 乔治洛德方法研究和开发液化空气有限公司 Method and apparatus for separating air by cryogenic distillation

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106091575A (en) * 2016-05-31 2016-11-09 浙江智海化工设备工程有限公司 A kind of expanded air bypass amount being matched in external compression space division reduces device and reduction method
CN106091575B (en) * 2016-05-31 2018-08-28 浙江智海化工设备工程有限公司 It is a kind of being matched in external compression space division expanded air bypass amount reduce device and reduce method
CN109387031A (en) * 2017-08-03 2019-02-26 乔治洛德方法研究和开发液化空气有限公司 Device and method for separating air by low temperature distillation
CN109387031B (en) * 2017-08-03 2021-11-02 乔治洛德方法研究和开发液化空气有限公司 Device and method for separating air by cryogenic distillation
CN111542724A (en) * 2017-11-29 2020-08-14 乔治洛德方法研究和开发液化空气有限公司 Method and apparatus for separating air by cryogenic distillation

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Granted publication date: 20120711