CN116271915A - Low-temperature rectifying tower - Google Patents

Abstract

The embodiment of the application discloses a low-temperature rectifying tower, relates to the technical field of rectifying facilities, and solves the problems of poor disaster resistance and high construction difficulty of the low-temperature rectifying tower in the related technology. The low-temperature rectifying tower comprises a shell assembly and rectifying equipment, wherein the shell assembly comprises an inner shell, a first vacuum chamber is formed in the inner shell, and at least part of the inner shell is buried at the lower side of the ground surface; the rectification apparatus is disposed in the first vacuum chamber. The low-temperature rectifying tower is used for separating air, isotopes and the like.

Description

Low-temperature rectifying tower

Technical Field

Embodiments of the present application relate to, but are not limited to, the field of rectification facilities, and in particular to a cryogenic rectification column.

Background

The low-temperature rectifying tower is used as main process equipment for air separation and isotope separation, has a complex structure, relates to the contents of a plurality of professional fields such as vacuum, low temperature, heat transfer, pressure bearing and the like, and has wide application in the fields such as national defense aviation, nuclear industry, petroleum and natural gas and the like.

The low-temperature rectifying towers widely used at present are mostly built by adopting a ground supporting mode, and when the tower height is very high, the rectifying towers occupy large space, have high requirements on shock resistance, wind load and snow load, are difficult to build, are difficult to repair and maintain, and have high operation cost.

Disclosure of Invention

The low-temperature rectifying tower provided by the embodiment of the application can save the space on the upper side of the ground surface, has good natural load resisting capacity, and is convenient to construct and maintain.

The embodiment of the application provides a low-temperature rectifying tower, which comprises a shell assembly and rectifying equipment, wherein the shell assembly comprises an inner shell, a first vacuum chamber is formed in the inner shell, and at least part of the inner shell is buried at the lower side of the ground surface; the rectification apparatus is disposed in the first vacuum chamber.

According to the low-temperature rectifying tower provided by the embodiment of the application, the rectifying equipment can separate components with different volatilities in the mixture by utilizing the low-temperature rectifying principle so as to purify the required substances, and the shell component provides protection for the rectifying equipment and provides the environment required by the working of the rectifying equipment. Specifically, the shell assembly comprises an inner shell, a first vacuum chamber is formed in the inner shell, the rectifying equipment is arranged in the first vacuum chamber, and the first vacuum chamber can thermally isolate the rectifying equipment from the outside, so that heat exchange between the rectifying equipment and the outside is reduced, and the effect of low-temperature rectification is improved. On the basis, at least part of the inner layer shell is buried in the lower side of the ground surface, so that the capacity of the low-temperature rectifying tower for resisting disasters can be improved, on the first hand, wind and snow and the like only form load on the upper side of the ground surface, when at least part of the inner layer shell is positioned on the lower side of the ground surface, the part does not act with the wind and the snow to generate load, compared with the situation that the inner layer shell is positioned on the upper side of the ground surface, the part of the inner layer shell is positioned on the lower side of the ground surface, the stress area can be effectively reduced, and therefore wind load or snow load and the like are reduced. In the second aspect, at least part of the inner shell is buried in the lower side of the ground surface, and the part interacts with the stratum so as to firmly fix the inner shell in the stratum, and when the part of the inner shell on the upper side of the ground surface is subjected to load or natural disasters such as earthquake, the foundation of the inner shell is firmer, the bearing capacity is stronger, and the turnover accident is not easy to happen. In the third aspect, at least part of the inner layer shell is buried in the downside of the ground surface, is not influenced by wind erosion, sunlight and the like, is smaller in influence by weather factors, has longer service life and can reduce maintenance cost, so that the capability of the cryogenic rectification tower for resisting disasters can be effectively improved by burying at least part of the cryogenic rectification tower in the downside of the ground surface. Meanwhile, the earth surface atmosphere continuously flows under the influence of the environment, and the specific heat capacity of the atmosphere with the lower specific heat capacity of the stratum on the earth surface is larger than that of the atmosphere with the higher specific heat capacity, so that the stratum can be used as a heat insulation layer of the low-temperature rectifying tower, the heat exchange between the low-temperature rectifying tower and the atmosphere is reduced, and rectifying equipment in the low-temperature rectifying tower is kept at a proper working temperature. In addition, with at least part of inlayer casing buried underground, can reduce the space occupation of cryogenic rectification tower to earth's surface upside to practice thrift space resource, and the cryogenic rectification tower of same size, more bearing structure is needed when its positive elevation construction, and the structure is more complicated, and construction and maintenance cost are also higher. Compared with the scheme that the low-temperature rectifying tower is integrally built on the upper side of the ground surface in the related art, the low-temperature rectifying tower has the advantages that at least part of the inner shell of the low-temperature rectifying tower is buried on the lower side of the ground surface, the space on the upper side of the ground surface can be saved, meanwhile, the low-temperature rectifying tower has good natural load resisting capacity, and the low-temperature rectifying tower is good in heat preservation effect and convenient to build and maintain.

In one possible implementation manner of the application, the inner shell comprises a first shell and a second shell, and the first shell is arranged on the upper side of the ground surface; the second shell is buried in the lower side of the ground surface, and the first shell is fixedly connected with the second shell; wherein, the extending direction of the first casing and the extending direction of the second casing are both along the gravity direction. On one hand, the inner shell is split into a plurality of components, so that the components can be conveniently and simultaneously processed and produced, and finally the components are spliced together, so that the construction time is saved; on the other hand, the first casing that is located the earth's surface upside accessible is fixed in the second casing of earth's surface downside in detachable, conveniently maintains first casing and inside rectifying apparatus thereof, and in addition, the first casing and the second casing straightness that hangs down of vertical setting along the direction of gravity are better, and stability is also better.

In one possible implementation manner of the present application, the first housing has a first size along a gravity direction, the second housing has a second size along the gravity direction, and the second size is greater than or equal to the first size. So set up, the inlayer casing buries more in the part of subsurface side, and its atress area that receives the snow load is littleer, and receives the partial area that stratum supported bigger, and bearing capacity is stronger.

In one possible implementation of the present application, the inner shell further includes a mounting seat, the mounting seat is disposed between the first shell and the second shell, the mounting seat is fixed on an upper side of the ground surface, and a radial dimension of the mounting seat is greater than a radial dimension of the second shell. So set up, the mount pad can be stable fix in the upside of earth's surface, and the great radial dimension of mount pad can provide more supports in vertical direction to reduce the crooked possibility of low temperature rectifying column.

In one possible implementation of the present application, the housing assembly further includes an outer housing fixedly connected to the mounting base, and a second vacuum chamber is formed inside the outer housing, at least a portion of the second housing being disposed in the second vacuum chamber. On one hand, the second vacuum chamber and the first vacuum chamber form a double-layer vacuum structure, so that the fault tolerance is higher, and the vacuum can be better kept; on the other hand, the outer surface of the second shell is positioned in the vacuum environment of the second vacuum chamber and is not easy to corrode by the environment, so that the service life of the second shell is prolonged.

In one possible implementation of the application, the second housing is suspended from the underside of the mount; or, the outer shell and the second shell are suspended at the lower side of the mounting seat. So set up, the second casing adopts to hang the installation, or outer casing and second casing all adopt to hang the installation, can solve the thermal stress that the difference in temperature arouses, and hang the installation and compare rigid connection and have better shock resistance.

In one possible implementation of the application, the outer shell is made of a corrosion resistant material. By the arrangement, the service life of the outer shell can be prolonged, and better protection is provided for the second shell inside the outer shell.

In one possible implementation of the present application, the first vacuum chamber includes a first cavity located inside the first housing, and a second cavity located inside the second housing; the rectifying equipment comprises a condenser, a rectifying column, a reboiler and a heater, wherein the condenser, the rectifying column and the heater are sequentially communicated, and the heater is used for heating the reboiler; and the condenser is positioned in the first cavity, and the rectifying column, the reboiler and the heater are positioned in the second cavity. So set up, equipment that maintenance demand is high such as condenser sets up in first cavity, is convenient for maintain, equipment that maintenance demand is low such as rectifying column, reboiler is placed in the second cavity, and the overall arrangement is more reasonable.

In one possible implementation of the present application, the rectification apparatus further includes a plurality of gas-liquid distributors, the gas-liquid distributors include an interface portion, and the interface portions of the plurality of gas-liquid distributors are disposed at intervals along an axis direction of the rectification column and are communicated to the rectification column. The gas-liquid distributor can reduce the mixing of gas and liquid, and the gas-liquid distributor is arranged to effectively reduce the gas-liquid mixing caused by overlong rectifying column, thereby improving the separation and purification effect.

In one possible implementation of the present application, the outer surface of the rectification apparatus is provided with a protective layer made of a thermally insulating and corrosion-resistant material. By the arrangement, on one hand, the maintenance requirement of the rectification equipment can be reduced, and on the other hand, the heat insulation effect can be improved, and the low-temperature rectification effect can be improved.

Drawings

Fig. 1 is a schematic structural diagram of a low-temperature rectifying tower according to an embodiment of the present application;

fig. 2 is a schematic structural diagram of an inner shell in a low-temperature rectifying tower according to an embodiment of the present disclosure;

fig. 3 is a schematic structural diagram of an installation seat in the low-temperature rectifying tower according to the embodiment of the present application;

fig. 4 is a schematic structural diagram of an outer shell in a low-temperature rectifying tower according to an embodiment of the present disclosure;

FIG. 5 is a schematic view of a second shell and an outer shell in a cryogenic rectification tower according to an embodiment of the present application;

fig. 6 is a schematic layout diagram of a rectifying column in a low-temperature rectifying tower according to an embodiment of the present application;

fig. 7 is a schematic layout diagram of a gas-liquid distributor in a low-temperature rectifying tower according to an embodiment of the present application.

Reference numerals:

1-a housing assembly; 11-an inner shell; 111-a first housing; 112-a second housing; 113-a mounting base; 12-a first vacuum chamber; 121-a first cavity; 122-a second cavity; 13-an outer shell; 14-a second vacuum chamber; 2-rectifying equipment; 21-a condenser; 22-a rectifying column; 23-reboiler; 24-a gas-liquid distributor; 3-formation.

Detailed Description

For the purposes, technical solutions and advantages of the embodiments of the present application to be more apparent, the specific technical solutions of the present application will be described in further detail below with reference to the accompanying drawings in the embodiments of the present application. The following examples are illustrative of the present application, but are not intended to limit the scope of the present application.

In the present embodiments, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the embodiments of the present application, unless otherwise indicated, the meaning of "a plurality" is two or more.

Furthermore, in the embodiments of the present application, the terms "upper," "lower," "left," and "right," etc., are defined with respect to the orientation in which the components in the drawings are schematically disposed, and it should be understood that these directional terms are relative terms, which are used for descriptive and clarity with respect to each other, and which may vary accordingly with respect to the orientation in which the components in the drawings are disposed.

In the embodiments herein, unless explicitly specified and limited otherwise, the term "connected" is to be construed broadly, and for example, "connected" may be either a fixed connection, a removable connection, or an integral body; can be directly connected or indirectly connected through an intermediate medium.

In the present embodiments, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.

In the embodiments of the present application, words such as "exemplary" or "such as" are used to mean serving as examples, illustrations, or descriptions. Any embodiment or design described herein as "exemplary" or "for example" should not be construed as preferred or advantageous over other embodiments or designs. Rather, the use of words such as "exemplary" or "such as" is intended to present related concepts in a concrete fashion.

The embodiment of the application provides a low-temperature rectifying tower which is main process equipment for air separation and isotope separation and has wide application in the fields of national defense aviation, nuclear industry, petroleum and natural gas and the like.

Referring to fig. 1, 2 and 3, the cryogenic rectification column provided in the embodiments of the present application includes a housing assembly 1 and rectification apparatus 2, the housing assembly 1 includes an inner housing 11, a first vacuum chamber 12 is formed inside the inner housing 11, and at least a portion of the inner housing 11 is buried in the underside of the ground surface; the rectification apparatus 2 is arranged in a first vacuum chamber 12, wherein the earth surface is the upper surface of the formation 3.

According to the low-temperature rectifying tower provided by the embodiment of the application, the rectifying equipment 2 can separate components with different volatilities in the mixture by utilizing the low-temperature rectifying principle so as to purify the required substances, and the shell component 1 provides protection for the rectifying equipment 2 and provides the environment required by the working of the rectifying equipment 2.

Specifically, the shell assembly 1 includes an inner shell 11, a first vacuum chamber 12 is formed inside the inner shell 11, the rectification apparatus 2 is disposed in the first vacuum chamber 12, and the first vacuum chamber 12 can thermally isolate the rectification apparatus 2 from the outside, so as to reduce heat exchange between the rectification apparatus 2 and the outside, and improve the effect of cryogenic rectification.

On this basis, at least part of the inner shell 11 is buried in the downside of the ground surface, so that the capability of the low-temperature rectifying tower for resisting disasters can be improved, specifically:

in the first aspect, the wind and snow or the like only form a load on the upper side of the ground surface, and when at least a part of the inner shell 11 is located on the lower side of the ground surface, the part does not act with the wind and snow to generate a load, and compared with the case where the inner shells 11 are all located on the upper side of the ground surface, the part of the inner shell 11 located on the lower side of the ground surface can effectively reduce the stress area, thereby reducing the wind load or the snow load or the like.

In the second aspect, at least a part of the inner shell 11 is buried under the ground surface, and the part interacts with the stratum 3, so that the inner shell 11 is firmly fixed in the stratum 3, and when the part of the inner shell 11 above the ground surface is subjected to a load or natural disasters such as an earthquake, the foundation of the inner shell 11 is firmer, the bearing capacity is stronger, and the overturning accident is not easy to happen.

In the third aspect, at least part of the inner layer housing 11 is buried under the ground surface, is not affected by wind erosion, sun exposure, etc., is less affected by weather factors, has a longer life, and can reduce maintenance costs, so that the capability of the cryogenic rectification tower against disasters can be effectively improved by burying at least part of the cryogenic rectification tower under the ground surface.

Meanwhile, because the earth surface atmosphere is continuously flowing under the influence of the environment, the specific heat capacity of the atmosphere with the lower specific heat capacity of the stratum 3 at the earth surface is larger, the stratum 3 can also be used as a heat insulation layer of the low-temperature rectifying tower so as to reduce heat exchange between the low-temperature rectifying tower and the atmosphere, and the rectifying equipment 2 in the low-temperature rectifying tower is kept at a proper working temperature.

In addition, with the at least part of inlayer casing 11 buried underground, can reduce the space occupation of cryogenic rectification tower to the earth's surface upside to practice thrift space resource, and the cryogenic rectification tower of same size, need more bearing structure when its positive elevation construction, the structure is more complicated, construction and maintenance cost are also higher, adopts the scheme of this application then can build the cryogenic rectification tower that the axial size is great, for example, the CO isotope cryogenic rectification tower axial size of part buried in the earth's surface downside can reach 177 meters.

Compared with the scheme that the low-temperature rectifying tower is integrally built on the upper side of the ground surface in the related art, the low-temperature rectifying tower has the advantages that at least part of the inner shell of the low-temperature rectifying tower is buried on the lower side of the ground surface, the space on the upper side of the ground surface can be saved, meanwhile, the low-temperature rectifying tower has good natural load resisting capacity, and the low-temperature rectifying tower is good in heat preservation effect and convenient to build and maintain.

In this application, the inner shell 11 may have various possible structural forms, and the inner shell 11 may be spherical, block-shaped, columnar, table-shaped, etc., where the columnar may be a cylinder, a triangular prism, a quadrangular prism, a hexagonal prism, etc., and the table-shaped may be a round table, a quadrangular prism table, etc., which is not limited in this application.

Referring to fig. 1, in one possible embodiment of the present application, the inner shell 11 is in a cylindrical structure, along the central axis direction thereof, a portion where the inner layer may be buried under the ground surface, the upper end surface of the inner shell 11 may be a plane or a curved surface, and correspondingly, the lower end surface of the inner shell 11 may also be a plane or a curved surface, in one possible embodiment of the present application, the upper end surface of the inner shell 11 is a hemispherical surface protruding outwards, and the lower end surface of the inner shell 11 is a plane.

In addition, the inner shell 11 may be an integral structure or may be formed by splicing a plurality of components, referring to fig. 2 and 3, in one possible embodiment of the present application, the inner shell 11 includes a first shell 111 and a second shell 112, and the first shell 111 is disposed on the upper side of the ground surface; the second housing 112 is buried under the ground surface, and the first housing 111 and the second housing 112 are fixedly connected.

Specifically, the first vacuum chamber 12 includes a first cavity 121 inside the first housing 111, and a second cavity 122 inside the second housing 112; the opening of the first cavity 121 is located at the lower side of the first housing 111, the opening of the second cavity 122 is located at the upper side of the second housing 112, and the opening of the first housing 111 is butted with the opening of the second housing 112, so that the sealing treatment is performed at the fixed connection position of the first housing 111 and the second housing 112 in order to ensure the sealing performance of the first vacuum chamber 12.

The fixed connection can be fixed in a non-detachable manner such as welding or in a detachable manner such as clamping and fastening, so that on one hand, the inner shell 11 is split into a plurality of components, so that the components are conveniently and simultaneously processed and produced, and finally the components are spliced together, so that the construction time is saved; on the other hand, the first housing 111 located on the upper side of the ground surface can be detachably fixed to the second housing 112 on the lower side of the ground surface, so that maintenance of the first housing 111 and the rectifying apparatus 2 inside the same can be facilitated.

It should be noted that, the first casing 111 and the second casing 112 may be made of different materials, for example, the first casing 111 is located on the upper side of the ground surface and is easily corroded by sunlight, wind and snow, etc., a material with light weight and good wind and sun resistance may be used, the second casing 112 is located on the lower side of the ground surface, a material with heavy weight, strong bearing capacity and good corrosion resistance may be selected, and optionally, both the first casing 111 and the second casing 112 are formed by welding stainless steel materials.

In addition, the structures of the first casing 111 and the second casing 112 may be the same or different, for example, the second casing 112 adopts a cylindrical structure, the first casing 111 adopts a circular truncated cone structure, which is not limited in this application, and only the first cavity 121 and the second cavity 122 need to be ensured to be communicated, and referring to fig. 2, 3 and 4, in one possible embodiment of the present application, the first casing 111 adopts a flat-bottom cylindrical structure, the second casing 112 adopts a convex-top cylindrical structure, and the radial dimension of the first casing 111 is identical to the radial dimension of the second casing 112, and the radial dimension of the first cavity 121 is also identical to the radial dimension of the second cavity 122.

In order to maintain the perpendicularity of the cryogenic rectification tower and reduce the influence of the dead weight of the cryogenic rectification tower on the stability thereof, referring to fig. 2, 3 and 4, in one possible embodiment of the present application, the extending direction of the first housing 111 and the extending direction of the second housing 112 are both set along the gravity direction, wherein the extending direction refers to the length direction of the member or the central axis direction of the revolution body, for example, the extending direction of the first housing 111 of the cylindrical structure is the central axis direction thereof.

In addition, the axial dimension of the inner shell 11 is not limited, and in order to further improve the disaster-resistant capability of the cryogenic rectification tower, referring to fig. 2, 3 and 4, in one possible embodiment of the present application, the first shell 111 has a first dimension along the gravity direction, the second shell 112 has a second dimension along the gravity direction, and the second dimension is greater than or equal to the first dimension. So set up, the part that inlayer casing 11 buried in the subsurface side is more, and its atress area that receives the snow load is less, and receives the partial area that stratum 3 supported bigger, and bearing capacity is stronger.

Referring to fig. 3 and 4, in one possible embodiment of the present application, the inner shell 11 further includes a mounting seat 113, the mounting seat 113 is disposed between the first shell 111 and the second shell 112, the mounting seat 113 is fixed on an upper side of the ground surface, and a radial dimension of the mounting seat 113 is greater than a radial dimension of the second shell 112. So set up, mount pad 113 can be stable fix in the upside of earth's surface, and the great radial dimension of mount pad 113 can provide more supports in vertical direction to reduce the askew possibility of cryogenic rectification tower.

The structure of the mounting seat 113 may be various forms, the mounting seat 113 may be a ring-mounted structure, a frame structure, or the like, the first housing 111 and the second housing 112 may be connected to the mounting seat 113, and an accommodating space is formed inside the mounting seat 113, where the accommodating space is a part of the first vacuum chamber 12, or the first housing 111 and the second housing 112 are directly connected, and at least one of the first housing 111 and the second housing 112 is fixedly connected to the mounting seat 113.

In one possible embodiment of the present application, the housing assembly 1 further includes an outer housing 13, the outer housing 13 is fixedly connected with the mounting seat 113, and a second vacuum chamber 14 is formed inside the outer housing 13, and at least a portion of the second housing 112 is disposed in the second vacuum chamber 14.

By the arrangement, on one hand, the second vacuum chamber 14 and the first vacuum chamber 12 form a double-layer vacuum structure, so that the fault tolerance is higher, and the vacuum can be better kept; on the other hand, the outer surface of the second housing 112 is in the vacuum environment of the second vacuum chamber 14, and is not easily corroded by the environment, thereby improving the service life of the second housing 112.

It should be noted that, the outer shell 13 may be fixedly connected to the second shell 112, and the outer shell 13 may also be fixedly connected to the mounting seat 113, so as to reduce thermal stress caused by environmental temperature difference and improve anti-seismic performance, referring to fig. 4 and 5, in one possible embodiment of the present application, the second shell 112 is suspended from the lower side of the mounting seat 113; alternatively, the outer housing 13 and the second housing 112 are suspended from the underside of the mount 113. The thermal stress caused by temperature difference can be solved by adopting the suspension installation, and compared with the rigid connection, the suspension installation has better anti-seismic performance.

The material of construction of the outer shell 13 is not limited in this application, and in one possible embodiment of the present application, the outer shell 13 is made of a corrosion resistant material. By doing so, the service life of the outer shell 13 can be improved, and better protection can be provided for the second shell 112 inside. Optionally, the outer shell 13 is made of stainless steel, carbon steel, or the like.

On the basis, the first vacuum chamber 12 is also provided with a rectifying device 2, and referring to fig. 3, 4 and 5, in one possible embodiment of the present application, the rectifying device 2 includes a condenser 21, a rectifying column 22, a reboiler 23 and a heater, where the condenser 21, the rectifying column 22 and the heater are sequentially communicated, and the heater is used for heating the reboiler 23; and condenser 21 is located in first cavity 121 and rectification column 22, reboiler 23 and heater are located in second cavity 122. So set up, equipment that maintenance demand is high such as condenser 21 sets up in first cavity 121, and the maintenance of being convenient for, equipment that maintenance demand is low such as rectifying column 22, reboiler 23 are placed in second cavity 122, and the overall arrangement is more reasonable.

The condenser 21 may use liquid nitrogen as a cold source, the rectification column 22 is filled with a filler, the condenser 21, the rectification column 22 and the reboiler 23 which are connected with each other may be welded and fixed to form a rectification module, the first vacuum chamber 12 is provided with a plurality of rectification modules, referring to fig. 6, the plurality of rectification modules are arranged along a projection array in a gravity direction, it should be noted that the rectification modules may also be fixed on the fixed seat in a suspension manner, and the heaters may be provided with a plurality of groups to improve fault tolerance, and when the rectification device 2 is operating normally, the heating power is controlled under low power to improve the service life of the heater.

In addition, the rectifying device 2 further comprises sensors, wherein the sensors can be arranged at various positions of the heater and the rectifying module so that an operator can control the running state of the rectifying device 2, and the sensors can comprise temperature sensors; the rectification apparatus 2 further comprises a vacuum pump for evacuating the first vacuum chamber 12 and the second vacuum chamber 14, a vacuum connector for communicating a pipe, a cable, etc. of the rectification apparatus 2 to the outside, and a valve, etc., wherein the vacuum pump, the vacuum connector, etc. are disposed in the first chamber 121, i.e. on the upper side of the ground surface, so as to facilitate routine maintenance.

Because the axial dimension of the cryogenic rectification tower of the present application is larger, that is, the length of the rectification column 22 is longer, in order to improve the effect of cryogenic rectification, referring to fig. 7, in one possible embodiment of the present application, the rectification column 22 is formed by sequentially welding a plurality of rectification sections along the axial direction thereof, the rectification apparatus 2 further includes a plurality of gas-liquid distributors 24, the gas-liquid distributors 24 include an interface portion, and the interface portions of the plurality of gas-liquid distributors 24 are disposed at intervals along the axial direction of the rectification column 22 and are communicated to the rectification column 22. The gas-liquid distributor 24 can reduce the mixing of gas and liquid, and the arrangement of a plurality of gas-liquid distributors 24 can effectively reduce the mixing of gas and liquid caused by overlong rectifying column 22, thereby improving the separation and purification effects.

In order to increase the service life of the rectifying effect of the rectifying device 2, optionally, in one possible embodiment of the present application, the outer surface of the rectifying device 2 is provided with a protective layer made of a heat-insulating and corrosion-preventing material, for example, the outer surface of the rectifying column 22 is wrapped with heat-insulating cotton, and the heater adopts an armoured structure or the like. By the arrangement, on one hand, the maintenance requirement of the rectification equipment 2 can be reduced, on the other hand, the heat insulation effect can be improved, the heat leakage is reduced, the gasification rate of the medium to be separated along the axial direction of the low-temperature rectification tower is reduced, and the low-temperature rectification effect is improved.

On the basis, the application also provides a construction method of the low-temperature rectifying tower, wherein the construction of the low-temperature rectifying tower is carried out according to the steps of firstly installing the outer shell 13, then installing the second shell 112 and rectifying equipment 2 in sequence, and finally installing the first shell 111, and when the outer shell 13 and the inner shell 11 are installed, the perpendicularity deviation of each component in the shell assembly 1 and the horizontal plane is required to be controlled, so that the low-temperature rectifying tower is in a vertical state after the construction is completed, in addition, in the welding process of the components, the welding seam is subjected to multiple liquid nitrogen freezing and re-heating treatment, and negative pressure helium leak detection and 100% ray detection are carried out after the welding is completed, and then leak detection indexes and flaw detection pieces are judged to be qualified and then are assembled, so that the stability and the tightness of the structure are ensured.

The foregoing embodiment numbers of the present application are merely for describing, and do not represent advantages or disadvantages of the embodiments. The foregoing description is only of the preferred embodiments of the present application, and is not intended to limit the scope of the claims, and all equivalent structures or equivalent processes using the descriptions and drawings of the present application, or direct or indirect application in other related technical fields are included in the scope of the claims of the present application.

Claims (10)

1. A cryogenic rectification column comprising:

the shell assembly comprises an inner shell, a first vacuum chamber is formed in the inner shell, and at least part of the inner shell is buried at the lower side of the ground surface;

and the rectification equipment is arranged in the first vacuum chamber.

2. The cryogenic rectification column of claim 1 wherein the inner shell comprises:

a first housing disposed on an upper side of the ground surface;

the second shell is buried in the lower side of the ground surface, and the first shell is fixedly connected with the second shell;

wherein, the extending direction of the first shell and the extending direction of the second shell are both arranged along the gravity direction.

3. The cryogenic rectification column of claim 2 wherein the first housing has a first dimension in the direction of gravity and the second housing has a second dimension in the direction of gravity and the second dimension is greater than or equal to the first dimension.

4. The cryogenic rectification tower of claim 2 or 3 wherein the inner shell further comprises a mounting seat disposed between the first shell and the second shell, the mounting seat being secured to an upper side of the earth's surface and the radial dimension of the mounting seat being greater than the radial dimension of the second shell.

5. The cryogenic rectification column of claim 4 wherein the housing assembly further comprises an outer housing fixedly connected to the mounting base and wherein a second vacuum chamber is formed within the outer housing, at least a portion of the second housing being disposed within the second vacuum chamber.

6. The cryogenic rectification column of claim 5 wherein the second housing is suspended from the underside of the mounting base; or, the outer shell and the second shell are suspended at the lower side of the mounting seat.

7. The cryogenic rectification column of claim 5 wherein the outer shell is made of a corrosion resistant material.

8. A cryogenic rectification column according to claim 2 or 3, wherein the first vacuum chamber comprises a first cavity inside a first shell and a second cavity inside the second shell;

the rectification equipment comprises a condenser, a rectification column, a reboiler and a heater, wherein the condenser, the rectification column and the heater are sequentially communicated, and the heater is used for heating the reboiler; and the condenser is located in the first cavity, and the rectification column, the reboiler and the heater are located in the second cavity.

9. The cryogenic rectification column of claim 8, wherein the rectification plant further comprises a plurality of gas-liquid distributors comprising interface portions, the interface portions of the plurality of gas-liquid distributors being spaced apart along the axis of the rectification column and being in communication therewith.

10. A cryogenic rectification tower according to any one of claims 1-3, characterized in that the outer surface of the rectification apparatus is provided with a protective layer made of a thermally insulating corrosion resistant material.

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