CN216953768U - Integrated system of air separation plant - Google Patents

Integrated system of air separation plant Download PDF

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Publication number
CN216953768U
CN216953768U CN202123333259.2U CN202123333259U CN216953768U CN 216953768 U CN216953768 U CN 216953768U CN 202123333259 U CN202123333259 U CN 202123333259U CN 216953768 U CN216953768 U CN 216953768U
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air separation
gas
integrated system
liquid
line
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CN202123333259.2U
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阿兰·布里格利亚
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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 CN202123333259.2U priority Critical patent/CN216953768U/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
    • F25J3/04763—Start-up or control of the process; Details of the apparatus used
    • F25J3/04866—Construction and layout of air fractionation equipments, e.g. valves, machines
    • F25J3/04951—Arrangements of multiple air fractionation units or multiple equipments fulfilling the same process step, e.g. multiple trains in a network
    • 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
    • F25J2210/00—Processes characterised by the type or other details of the feed stream
    • F25J2210/50—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
    • F25J2240/00—Processes or apparatus involving steps for expanding of process streams
    • F25J2240/40—Expansion without extracting work, i.e. isenthalpic throttling, e.g. JT valve, regulating valve or venturi, or isentropic nozzle, e.g. Laval
    • F25J2240/46—Expansion without extracting work, i.e. isenthalpic throttling, e.g. JT valve, regulating valve or venturi, or isentropic nozzle, e.g. Laval the fluid being 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
    • F25J2245/00—Processes or apparatus involving steps for recycling of process streams
    • F25J2245/50—Processes or apparatus involving steps for recycling of process streams the recycled stream being 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
    • F25J2290/00—Other details not covered by groups F25J2200/00 - F25J2280/00
    • F25J2290/60—Details about pipelines, i.e. network, for feed or product distribution

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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 discloses an integrated system of air separation plants, comprising n air separation plants, which are arranged at different locations and each comprise at least one heat exchange device and a rectification column, each heat exchange device comprising at least one liquid vaporization line for vaporizing a liquid product having a pressure Pi produced by the rectification column into a gas product having a pressure Pi, a part or all of which is fluidly connected to a gas transport pipeline network via a gas outlet pipeline of each air separation plant, wherein n > -2, i-1,. For conveying the gas product from the gas transportation pipeline network back to each air separation plant.

Description

Integrated system of air separation plant
Technical Field
The present invention relates to air separation plants, and in particular to an integrated system for an air separation plant.
Background
In large chemical industry applications, large amounts of oxygen and/or nitrogen are often required. For example, in coal gasification processes, large amounts of oxygen and nitrogen are used to convert coal to liquids, gases, or chemicals, among others; industries such as steel, metallurgy, etc. also have a great demand for oxygen and nitrogen. For these different customers, it is often necessary to build multiple plants at multiple different sites, each site being provided with one or more air separation plants for providing gaseous products to the gas consuming devices, i.e. the customers.
The production output of a certain product of an air separation plant is generally fixed, i.e. the nominal output at the design operating conditions. However, customer demand for gaseous products (including pressure and flow) may change over time. In coal gasification processes, for example, there are a number of different gasification techniques, one of which is characterized by the use of different oxygen and nitrogen pressures. In addition, the pressure of oxygen required may vary from 40bara (bar absolute) to 90bara due to catalyst aging, coal quality, load changes due to market conditions, etc. Furthermore, in some cases, the flow demand of the gas consumer for the gaseous product may reach, for example, 120% to 140% of the rated flow output.
Thus, different air separation plants may output different gaseous products at different pressures in order to meet the needs of different customers. In addition, the demand for flow and pressure of the gaseous product by customers at different locations may also vary over time. To cope with such variations in flow and/or pressure requirements, it is often necessary to design the air separation plant with a margin or oversize. Such a design with margin may be, for example, in the range of 10% to 15% of the rated operating conditions.
However, the design with margins has some drawbacks, mainly including:
large belt excess design increases the operating cost (OPEX) and capital expenditure (CAPEX) of the air separation plant;
the different pressures of the gaseous products at the different sites makes it difficult to exchange the products between the different sites.
SUMMERY OF THE UTILITY MODEL
The present invention aims to overcome the above-mentioned disadvantages of the prior art.
According to the present invention, there is provided an integrated system comprising n air separation plants, said air separation plants being located at different sites, and each comprising at least one heat exchange device and a rectification column, each heat exchange device comprising at least one liquid vaporization line, for vaporizing the liquid product having a pressure Pi produced by each of the rectification columns into a gas product having a pressure Pi, a part or all of the gas product having the pressure Pi is fluidly connected to a gas transport network via the gas outlet line of the respective air separation plant, where n > -2, i-1,., n, correspond to the 1 st to the nth air separation plants, respectively, characterized in that the gas pressure in the gas transport network is less than the minimum of the pressures Pi, and each air separation plant further comprises a gas receiving line for conveying the gas product in the gas transportation pipeline network back to each air separation plant.
Further, for each site's air separation plant, the integrated system comprises: optionally a first pressure reducing valve having an inlet fluidly connected to the gas outlet line of the air separation plant at the site and an outlet fluidly connected to the gas transportation pipeline network.
According to one embodiment, the heat exchange means of the air separation plant comprise at least one gas liquefaction line, the warm end of which is fluidly connected to the gas receiving line and the cold end of which is fluidly connected to the rectification column, and advantageously a second pressure reduction valve is optionally provided between the cold end of the gas liquefaction line and the rectification column.
According to a further embodiment, the heat exchange means of the air separation plant comprise at least one gas liquefaction line, the hot end of which is fluidly connected to the gas receiving line and the cold end of which is fluidly connected to the cold end of the liquid vaporization line, advantageously a liquid pump pressurizing the liquid product to Pi is provided between the cold end of the gas liquefaction line and the cold end of the liquid vaporization line.
According to a further embodiment, at least one gas backup device is also connected into the gas transport network, advantageously said gas backup device comprises a storage tank for the liquid gaseous product and its vaporization device.
Further, the liquid product described herein may comprise liquid oxygen or liquid nitrogen, and the gaseous product may comprise oxygen or nitrogen.
With the integrated system of air separation plants of the present invention, each site's air separation plant can be sized for rated operating conditions only or smaller without having to oversize the sizing design in order to operate most of the time at optimal operating costs and more efficiently, while being able to effectively cope with the change in demand for gaseous products over time.
When the gas demand of a customer becomes smaller, if the load of the air separation plant supporting the customer is reduced, the operating efficiency is also reduced, at which time the air separation plant can be kept operating at the design load and the surplus gas can be distributed to other customers in need through the gas transportation pipeline network.
Moreover, the pressure of the gas transport pipe network is selected to be smaller than the lowest gas product pressure of each air separation device connected with the gas transport pipe network, so that various gas products can be introduced into the gas transport pipe network without compression and can be transported to required customers.
Compared with the prior art in which the gas in the gas transportation pipe network is directly compressed to the pressure required by the customer through a compressor, the utility model avoids a separately installed compressor, and reduces the cost and the safety risk of especially compressing oxygen.
Drawings
Preferred embodiments of the present invention will be described in more detail below with reference to the schematic drawings. The drawings and the corresponding embodiments are for purposes of illustration only and are not intended to be limiting of the utility model. In the drawings:
FIG. 1 is a schematic illustration of an integrated system of an air separation plant according to the present invention;
fig. 2 is a schematic illustration schematically showing a part of the connection structure between the gas transport network and the air separation plant in the integrated system according to the utility model.
Detailed Description
In the embodiment shown in fig. 1, the integrated system 1 comprises three separate sites, each site being provided with two sets of air separation plants. The air separation plant at each site has its own operating conditions (mainly in terms of product flow and pressure) so that each site is always at the best operating cost. In the integrated system 1, at least two locations of air separation plants provide gas products at different pressures. Alternatively, the air separation plants at the three locations may provide product gases at different pressures.
It will be appreciated that the integrated system may include any number (at least two) of sites, and that any number of air separation plants may be provided per site. For example, an integrated system may comprise two, three or more different sites, each of which may be provided with only one, two or more air separation plants, the total number of all air separation plants contained in the integrated system being n, n > -2, each air separation plant being defined as ASU1, ASU2, ASU3, respectively, up to ASUn. The pressure of the gas product produced by each air separation plant may be defined as Pi, i 1., n, respectively, corresponding to the pressure of the gas product in each of the 1 st to nth air separation plants, i.e., ASU1, P1, ASU2, P2, and so on. Liquid and gaseous products refer to both liquid and gaseous products of the same purity and composition. For example, both may be oxygen of 99.99% purity. Gas products are generally referred to as gas products regardless of which air separation plant is producing the gas, as long as the gas is introduced into the same gas transportation pipeline network and has consistent purity and composition.
As shown in fig. 1, the three different site air separation plants ASU 1-ASU 6 are interconnected by a gas transport pipeline network 4, the gas pressure within the gas transport pipeline network 4 being less than the lowest gas product pressure Pi of the three site air separation plants, thereby allowing each site air separation plant to be able to supply gaseous product to the gas transport pipeline network 4 when needed. The gas product of each air separation plant is fluidly connected to a gas transport network 4 via a gas outlet line 3. A first pressure reduction valve 6 is provided on the gas outlet line 3 in order to reduce the pressure of the gas product to the operating pressure of the gas transport network 4 when required. Further, when the gas production of an ASU at a location is not sufficient for local customer demand, the gas product may be returned from the gas transportation network 4 to the ASU at the location via gas receiving line 5, liquefied, vaporized, and delivered to the desired customer.
In the integrated system 1 according to the utility model, the gaseous product of the air separation plant of each site can be conveyed to the air separation plants of other sites via a gas transport pipe network 4. In particular, even the location of the highest operating pressure can be supplied with gaseous product from the location of the lowest operating pressure.
Fig. 2 schematically shows part of the connection between the gas transport network 4 and the air separation plant at one of the sites. The connection is used to convey gaseous products, such as gaseous oxygen, from the gas transportation network 4, which operates at a lower pressure, to customers who require the gaseous products at a higher pressure.
As shown in fig. 2, a gaseous oxygen stream at a lower pressure from the gas transport pipeline 4 enters the gas liquefaction line 12 of the heat exchange device 7 via the gas receiving line 5. The heat exchange means 7 may be any heat exchange means comprising a liquid vaporisation line 11 and a liquid vaporisation line 12 capable of heat exchange with one another, for example the main heat exchanger of an air separation plant. The cold end of the heat exchange device is the end where the stream with lower temperature enters, and the stream is heated and even vaporized in the heat exchange device; the hot end of the heat exchange unit is the end into which the higher temperature stream enters, where it is cooled and even liquefied. The oxygen stream at least partially liquefied in the gas liquefaction line 12 is passed via a second pressure reduction valve 9 to the rectification column 8 of the air separation plant at that location. If the rectifying tower 8 comprises two towers with different operating pressures, namely a high-pressure tower and a low-pressure tower, at least part of liquefied oxygen flow can be selectively conveyed to a condensation evaporator at the bottom of the low-pressure tower, wherein the oxygen flow can be completely liquefied and conveyed to a liquid pump 10 along with liquid oxygen normally generated by the rectifying tower, after the pressure is increased to a proper pressure, the oxygen flow is reheated to gas through a liquid vaporization pipeline 11 of a heat exchange device 7 and then conveyed to a customer; when there is a surplus, it can also be fed into the gas transport network 4 via the gas outlet line 3.
If the oxygen stream passing through the gas liquefaction line 12 has been substantially completely liquefied, part or all of the oxygen stream may be delivered to the inlet end of the liquid pump 10, pressurized to a suitable pressure, reheated to a gas by the liquid vaporization line 11 of the heat exchange device 7, and delivered to the customer; when there is a surplus, it can also be fed into the gas transport network 4 via the gas outlet line 3.
By means of the integrated system 1, it is possible to easily import or export (through a gas transport network) a gaseous product, such as oxygen, depending on the operating conditions of a site. Thus, the air separation plant at each site can be sized for rated operation only or smaller without having to oversize the size design in order to operate at optimal operating costs and more efficiently most of the time. When one of the sites has a demand for the gas product that is above 100%, for example 120% or even up to 140% of the rated output of the air separation plant at that site, the gas product can be fed from other sites having excess gas product production capacity through the gas transport network.
If the total amount of gas product that can be provided by the entire integrated system does not meet the customer's demand for a certain period of time, at least one gas backup unit may be connected to the gas transportation network. The device can be an independently operated air separation plant or a tank for liquid gaseous products, and is equipped with corresponding vaporization means.
The integrated system of the air separation plant of the present invention has been described above with the aid of specific embodiments. It will be apparent to those skilled in the art that various changes and modifications can be made to the integrated system of the present invention without departing from the inventive concept thereof. Other embodiments will be apparent to those skilled in the art from consideration of the specification and practice of the disclosed integrated system. It is intended that the specification and examples be considered as exemplary only, with a true scope being indicated by the following claims and their equivalents.
List of reference numerals
1 Integrated System
2 air separation plant
3 gas output pipeline
4 gas transport pipe network
5 gas receiving line
6 first pressure reducing valve
7 heat exchange device
8 rectifying tower
9 second pressure reducing valve
10 liquid pump
11 liquid vaporization pipeline
12 gas liquefaction pipeline

Claims (9)

1. An integrated system of air separation plants, comprising n air separation plants, which are arranged at different locations and each comprise at least one heat exchange device and one rectification column, each heat exchange device comprising at least one liquid vaporization line for vaporizing a liquid product having a pressure Pi produced by the respective rectification column into a gas product having a pressure Pi, a part or all of which is fluidly connected to a gas transport network via a gas outlet line of the respective air separation plant, wherein n > 2, i 1,. For transporting the gas product from the gas transportation network back to the respective air separation plant.
2. The integrated system of air separation plants of claim 1, comprising, for each site of air separation plant: a first pressure reducing valve having an inlet fluidly connected to the gas outlet line of the air separation plant at the site and an outlet fluidly connected to the gas transport piping network.
3. Integrated system of air separation plants according to claim 1 or 2, characterized in that the heat exchange means of the air separation plant comprise at least one gas liquefaction line, the warm end of which is fluidly connected to a gas receiving line and the cold end of which is fluidly connected to the rectification column.
4. The integrated system of air separation plants of claim 3, characterized in that a second pressure reducing valve is provided between the cold end of the gas liquefaction line and the rectification column.
5. The integrated system of air separation plants of claim 1 or 2, wherein the heat exchange means of the air separation plant comprises at least one gas liquefaction line, the hot end of which is fluidly connected to the gas receiving line and the cold end of which is fluidly connected to the cold end of the liquid vaporization line.
6. Integrated system of air separation plants according to claim 5, characterized in that a liquid pump is provided between the cold end of the gas liquefaction line and the cold end of the liquid vaporization line to pressurize the liquid product to a pressure Pi.
7. Integrated system of air separation plants according to claim 1 or 2, characterized in that at least one gas backup device is also inserted into the gas transport network.
8. An integrated system for an air separation plant according to claim 7 wherein the gas back-up means comprises a storage tank for liquid gaseous product and means for vaporising the same.
9. The integrated system of air separation plants of claim 1 or 2, wherein the liquid product comprises liquid oxygen or liquid nitrogen and the gaseous product comprises oxygen or nitrogen.
CN202123333259.2U 2021-12-28 2021-12-28 Integrated system of air separation plant Active CN216953768U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202123333259.2U CN216953768U (en) 2021-12-28 2021-12-28 Integrated system of air separation plant

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Application Number Priority Date Filing Date Title
CN202123333259.2U CN216953768U (en) 2021-12-28 2021-12-28 Integrated system of air separation plant

Publications (1)

Publication Number Publication Date
CN216953768U true CN216953768U (en) 2022-07-12

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