Connecting mechanism for air separation tower body and main condensation evaporator

Abstract

The utility model relates to the technical field of air separation equipment, in particular to a connecting mechanism for an air separation tower body and a main condensation evaporator, the air separation tower body comprises an upper tower body and a lower tower body, the connecting structure is used for connecting the upper tower body, the main condensation evaporator and the lower tower body, and the connecting structure comprises a connecting piece, a fixing sleeve and a plurality of supporting pieces. The top of the connecting piece is fixedly connected with the upper tower body, the bottom of the connecting piece is fixedly connected with the main condensation evaporator, the fixing sleeve is arranged on the outer wall of the upper portion of the lower tower body in a sleeving mode, and the supporting pieces are arranged on the circumferential wall of the fixing sleeve in a surrounding mode and used for supporting and fixing the bottom of the main condensation evaporator. According to the utility model, the upper tower body, the main condensation evaporator and the lower tower body are connected and arranged through the connecting structures to form an integrated structure, so that the deformation of the upper tower body, the main condensation evaporator and the lower tower body is consistent under the condition of thermal expansion and cold contraction, and meanwhile, the thermal stress of the equipment is eliminated, so that the air separation equipment can meet the requirement of coaxiality, and the safety performance of the air separation equipment is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of air separation equipment, in particular to a connecting mechanism for an air separation tower body and a main condensing evaporator. Background Art

[0002] In the cryogenic air separation equipment, the upper tower and the lower tower are the main distillation tower components in the complete set of equipment. The air relies on pressure and gravity to complete low-temperature distillation step by step to separate the product oxygen and nitrogen as well as argon fraction gas. The main condenser evaporator is the core of the whole set of cryogenic distillation equipment. In the condenser evaporator, the nitrogen at the top of the lower tower is condensed, and the liquid oxygen at the bottom of the upper tower is evaporated to provide the reflux liquid required by the lower tower and the rising steam required by the upper tower. The distillation of the upper and lower towers depends entirely on the heat exchange of the main condenser evaporator to complete the continuous distillation process of nitrogen and oxygen.

[0003] Due to the characteristics of continuous cryogenic distillation, the three main equipment must be assembled vertically. Due to the market demand trend of large-scale equipment, the dimensions of the three equipment are getting larger and larger. In addition to the diameter of a single device, the overall length after assembly often exceeds the size limit of road freight transportation. Therefore, the distillation towers of medium and large air separation equipment often need to be transported separately to the final use site, and then the final assembly of the distillation towers is completed.

[0004] However, the assembly has very high requirements for the verticality of the distillation tower. When overlapping, a lot of temporary tooling is often required to meet the verticality installation requirements, and the traditional connection mechanism cannot meet the coaxiality requirements, and the traditional welding method is the fillet weld welding method. Due to the characteristics of the fillet weld itself, the fillet weld cannot make the weld completely melted, and the welding strength of the fillet weld is low. In order to meet the strength requirements of the connection mechanism, the fillet welds must be stacked very high to meet the strength requirements, and the fillet welds with high weld feet are very prone to defects, which can easily cause leakage at the connection mechanism. At the same time, in order to support the gravity load of the upper tower, the prior art sets a grid frame inside the main condenser evaporator as the load-bearing structure of the upper tower, and this structure is complex, and the installation and assembly are labor-intensive and material-intensive, and the welding stress is concentrated, which is very likely to cause safety hazards. Therefore, it is urgently necessary to design a connection mechanism between the air separation tower body and the main condenser evaporator to solve the above problems. Utility Model Content

[0005] The purpose of the utility model is to provide a connection mechanism for an air separation tower body and a main condenser evaporator, which solves the above-mentioned problems that the tower body is too high to be transported separately and assembled later, the coaxiality of the upper tower body, the main condenser evaporator and the lower tower body cannot be guaranteed during assembly, the welding method of the fillet weld cannot meet the appearance requirements, and leakage is also prone to occur, and the existing main condenser evaporator has a grid frame as a load-bearing structure inside, which is labor-intensive and material-intensive and prone to safety hazards.

[0006] In order to solve the above technical problems, the utility model provides a connection mechanism for an air separation tower body and a main condenser evaporator, wherein the air separation tower body comprises an upper tower body and a lower tower body, and the connection mechanism is used to connect the upper tower body, the main condenser evaporator and the lower tower body.

[0007] The connecting mechanism includes a connecting member, a fixing sleeve and a plurality of supporting members. The top of the connecting member is fixedly connected to the upper tower body, and the bottom is fixedly connected to the main condensing evaporator. The fixing sleeve is mounted on the upper outer wall of the lower tower body. The plurality of supporting members are arranged around the peripheral wall of the fixing sleeve and are used to support and fix the bottom of the main condensing evaporator.

[0008] Furthermore, the support member is one or more of I-shaped aluminum, H-shaped aluminum, L-shaped aluminum, U-shaped aluminum or T-shaped aluminum.

[0009] Furthermore, the bottom of the upper tower body is fixed to the connecting piece by full penetration butt welding.

[0010] Furthermore, the main condenser evaporator comprises an evaporator core, a first cylinder and a first cone, the evaporator core is installed in the first cylinder, and the first cylinder is fixedly arranged on the first cone.

[0011] Furthermore, the support member and the first cone are fixed by full penetration butt welding.

[0012] Furthermore, the upper section of the connecting piece is cylindrical, and the lower section is in an inverted cone shape.

[0013] Furthermore, the upper tower body, the connecting piece, the first cylinder body, the first cone body and the lower tower body are coaxially arranged.

[0014] Furthermore, the first cylinder and the first cone are an integrally formed structure.

[0015] The beneficial effects of the utility model are as follows: the upper tower body, the main condenser evaporator and the lower tower body of the utility model are connected and regularized by a connecting mechanism, and the three form an integrated structure, so that the three are deformed in the case of thermal expansion and contraction in a consistent manner, and the thermal stress of the equipment itself is eliminated, so that the air separation equipment can meet the coaxiality requirements, thereby improving the safety performance of the air separation equipment and avoiding leakage of the vapor and liquid phases in the air separation equipment;

[0016] The lower tower body and the main condenser evaporator adopt the design of a fixed sleeve and a support member on the side wall of the fixed sleeve, so that the support member can support the first cone of the main condenser evaporator and also can weld the two by full penetration butt welding, so that the upper tower body, the connecting member, the first cone, the first cylinder and the lower tower body can meet the coaxial requirements to avoid the occurrence of safety hazards;

[0017] The design of the integrally formed structure of the first cylinder and the first cone can avoid the problem of deviation of the transition section of the existing main condenser evaporator shell during welding, and can also avoid the problem of safety hazards caused by welding stress concentration. At the same time, it can also reduce the cost of equipment investment and enable the complete air separation unit to operate stably, safely and for a long period of time. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solution of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 This is an overall structural diagram of a connection mechanism between an air separation tower body and a main condenser evaporator of the utility model;

[0020] Figure 2 It is a partial enlarged view of A of a connection mechanism between an air separation tower body and a main condenser evaporator of the utility model;

[0021] Figure 3 It is a partial enlarged view of B of a connection mechanism between an air separation tower body and a main condenser evaporator of the utility model;

[0022] In the figure: 1-main condenser evaporator, 2-upper tower body, 3-lower tower body, 4-connecting mechanism, 11-evaporator core, 12-first cylinder, 13-first cone, 41-connecting piece, 42-fixing sleeve, 43-supporting piece, 411-upper section, 412-lower section. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings of the utility model specification to clearly and completely describe the technical solutions in the utility model embodiments. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0024] In a specific embodiment of the present invention, Figure 1-3As shown, a connection mechanism for an air separation tower body and a main condenser evaporator is specifically disclosed, wherein the connection mechanism 4 is used to connect the upper tower body 2, the main condenser evaporator 1 and the lower tower body 3 which are arranged in sequence, so that the upper tower body 2, the main condenser evaporator 1 and the lower tower body 3 form an integrated structure, so that the deformation of the three under the condition of thermal expansion and contraction is consistent, and at the same time, the thermal stress of the equipment itself is eliminated, so that the air separation equipment can meet the coaxiality requirements, so as to improve the safety performance of the air separation equipment and avoid leakage of the vapor-liquid phase in the air separation equipment;

[0025] The main condensing evaporator 1 comprises an evaporator core 11, a first cylinder 12 and a first cone 13. The evaporator core 11 is installed in the first cylinder 12. The evaporator core 11 is connected to a plurality of vapor-liquid feed pipes and vapor-liquid discharge pipes, and the other ends of the plurality of vapor-liquid feed pipes and vapor-liquid discharge pipes respectively pass through the inner wall of the first cylinder 12 and extend out. The first cylinder 12 is fixedly arranged on the first cone 13. The first cylinder 12 and the first cone 13 are an integrally formed structure. The above design can avoid the problem of deviation of the transition section of the shell of the existing main condensing evaporator 1 during welding, and can also avoid the problem of safety hazards caused by welding stress concentration. At the same time, it can also reduce the cost of equipment investment, so that the complete air separation unit can operate stably, safely and for a long period of time.

[0026] The connecting mechanism 4 includes a connecting piece 41, a fixing sleeve 42 and a plurality of supporting pieces 43. The bottom of the upper tower body 2 is fixed to the connecting piece 41 by full penetration butt welding. The bottom of the connecting piece 41 is fixedly connected to the first cylinder 12. The upper section 411 of the connecting piece 41 is cylindrical, and the lower section 412 is inverted cone shape. The upper section 411 is fixed to the bottom of the upper tower body 2 by full penetration butt welding. The lower section 412 is fixed to the top of the first cylinder 12 by full penetration butt welding. The fixing sleeve 42 is sleeved on the upper outer wall of the lower tower body 3. A plurality of supporting pieces 43 are provided. The support member 43 is arranged around the peripheral wall of the fixing sleeve 42, and the support member 43 and the first cone 13 are fixed by full penetration butt welding. Each support member 43 is used to support and fix the bottom of the main condenser evaporator 1, so that the support member 43 can support the first cone 13 of the main condenser evaporator 1 while also enabling the two to be welded by full penetration butt welding, so that the upper tower body 2, the connecting member 41, the first cone 13, the first cylinder 12 and the lower tower body 3 can meet the coaxial requirements to avoid the occurrence of safety hazards.

[0027] The support member 43 is one or more of I-shaped aluminum, H-shaped aluminum, L-shaped aluminum, U-shaped aluminum or T-shaped aluminum. If I-shaped aluminum or T-shaped aluminum is used, it is flipped 90 degrees and fixed on the outer wall of the fixing sleeve 42 so that the long side is located on the outside. The utility model is preferably I-shaped aluminum.

[0028] The upper tower body 2 , the connecting piece 41 , the first cone 13 , the first cylinder 12 and the lower tower body 3 are coaxially arranged.

[0029] The workflow of this utility model:

[0030] The connection method of the upper tower body 2, the main condenser evaporator 1 and the lower tower body 3 is as follows:

[0031] A plurality of support members 43 are fixed to the peripheral wall of the fixing sleeve 42 respectively, and the fixing sleeve 42 is sleeved on the upper part of the lower tower body 3 and fixed to the outer wall of the lower tower body 3, and the cone ends of the integrally formed first cylinder 12 and the first cone 13 are placed on the I-beam aluminum of the support member 43, and the distance between the outer wall of the cone end and the edge of the I-beam aluminum is adjusted by the positioning block, so that the first cylinder 12, the first cone 13 and the lower tower body 3 are coaxial, and the positioning block is made of a heat-meltable material, and the positioning block is fully penetrated and welded by full penetration butt welding, so that the first cone 13 and the I-beam aluminum can be firmly welded together, and then the evaporator core 11 is installed in the first cylinder 12, and then the connecting member 41 is placed in the first cylinder On the body 12, the bottom of the inverted cone of the lower section 412 of the connecting piece 41 is adjusted and aligned with the outer wall of the first cylinder 12 by the adjusting block, and the adjusting block is further fully penetrated by butt welding, so that the connecting piece 41 and the first cylinder 12 are coaxial and firmly welded together, and then the upper tower body 2 is also fully penetrated by butt welding of the adjusting block, so that the upper tower body 2 and the cylindrical upper end of the upper section 411 of the connecting piece 41 are welded and fixed together, thereby completing the assembly. The above method can effectively make the upper tower body 2, the connecting piece 41, the first cylinder 12, the first cone 13 and the lower tower body 3 meet the coaxial requirements to avoid the occurrence of safety hazards.

[0032] The above disclosure is only a preferred embodiment of the present invention, and certainly cannot be used to limit the scope of rights of the present invention. Therefore, equivalent changes made according to the claims of the present invention are still within the scope covered by the present invention.

Claims

1. A connecting mechanism for an air separation tower body and a main condenser evaporator, characterized in that: The air separation tower body comprises an upper tower body (2) and a lower tower body (3), and the connecting mechanism (4) is used to connect the upper tower body (2), the main condenser evaporator (1) and the lower tower body (3). The connecting mechanism (4) comprises a connecting member (41), a fixing sleeve (42) and a plurality of supporting members (43); the top of the connecting member (41) is fixedly connected to the upper tower body (2), and the bottom is fixedly connected to the main condensing evaporator (1); the fixing sleeve (42) is sleeved on the upper outer wall of the lower tower body (3); and the plurality of supporting members (43) are arranged around the peripheral wall of the fixing sleeve (42) and are used to support and fix the bottom of the main condensing evaporator (1).

2. The connecting mechanism for an air separation tower body and a main condenser evaporator according to claim 1, characterized in that: The main condensing evaporator (1) comprises an evaporator core (11), a first cylinder (12) and a first cone (13); the evaporator core (11) is installed in the first cylinder (12), and the first cylinder (12) is fixedly arranged on the first cone (13).

3. The connecting mechanism for an air separation tower body and a main condenser evaporator according to claim 1, characterized in that: The support member (43) is one or more of I-shaped aluminum, H-shaped aluminum, L-shaped aluminum, U-shaped aluminum or T-shaped aluminum.

4. The connecting mechanism for an air separation tower body and a main condenser evaporator according to claim 1, characterized in that: The bottom of the upper tower body (2) is fixed to the connecting piece (41) by full penetration butt welding.

5. The connecting mechanism for an air separation tower body and a main condenser evaporator according to claim 2, characterized in that: The support member (43) and the first cone (13) are fixed by full penetration butt welding.

6. The connecting mechanism for an air separation tower body and a main condenser evaporator according to claim 1, characterized in that: The upper section (411) of the connecting piece (41) is cylindrical, and the lower section (412) is in an inverted cone shape.

7. The connecting mechanism for an air separation tower body and a main condenser evaporator according to claim 2, characterized in that: The upper tower body (2), the connecting piece (41), the first cylinder body (12), the first cone body (13) and the lower tower body (3) are coaxially arranged.

8. The connecting mechanism for an air separation tower body and a main condenser evaporator according to claim 2, characterized in that: The first cylinder (12) and the first cone (13) are an integrally formed structure.

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