Sleeve type degassing tower

Abstract

The utility model provides a sleeve type degassing tower, which aims to solve the problems of difficulty in installation of internal parts of the degassing tower, point leakage risk of the degassing tower and high time and cost for disassembly and assembly of the internal parts of the tower, and comprises a buffer tank, a reboiler connected to one side of the buffer tank, and a tower body, a demister and a cooler which are sequentially connected to the upper part of the buffer tank from bottom to top, the tower body is of an integrated structure, the inner sleeve is fixedly connected to the interior of the tower body, the tower internals are fixedly connected to the interior of the inner sleeve, and the integrated structure of the tower body and the inner sleeve is adopted, so that the leakage risk at the joint of a multi-section structure of a traditional degassing tower can be avoided, and the installation and maintenance efficiency can be effectively improved.

Description

Technical Field

[0001] This utility model relates to the technical field of polyolefin chemical production equipment, and in particular to a sleeve-type degassing tower. Background Technology

[0002] In polyolefin chemical production, the raw materials contain impurities such as CO, CO2, O2, and light hydrocarbons. These impurities are toxic to polymerization catalysts and can reduce their activity. Therefore, the raw material refining unit is usually equipped with a degassing tower, which removes impurities such as CO from the raw materials through distillation.

[0003] Because the flow rates of by-products such as propylene, butene, and hexene in the synthesis of monomers are relatively small, and the degassing tower is long and slender, personnel cannot crawl inside to install the internal components. To solve the problem of internal component installation, traditional degassing towers are designed as multi-section towers connected by flanges. The installation of internal components requires first installing the internal components into each section of the tower, and then assembling the prefabricated multi-section tower as a whole and tightening it with flanges and bolts. Since the downcomer of the internal components has installation direction requirements, the technical requirements for assembling multi-section towers are higher than those for integrated distillation towers. Furthermore, traditional polyolefin monomer degassing towers have diameters ranging from 600mm to 1000mm, and each degassing tower is divided into more than 4 sections, which are connected as a whole by at least 4 pairs of flanges. The flange setup increases the risk of leaks. The workload for disassembly, assembly, and maintenance of multi-section distillation towers is greater than that of integrated towers, resulting in higher time costs. Utility Model Content

[0004] This utility model provides a sleeve-type degassing tower to solve the problems of difficult installation of degassing tower internals, risk of leakage, and high time and cost of disassembling and assembling internals. To achieve the above objectives, the technical solution adopted is as follows:

[0005] A sleeve-type degassing tower includes a buffer tank, a reboiler connected to one side of the buffer tank, a tower body, a demister, and a cooler connected sequentially from bottom to top above the buffer tank. The tower body is an integral structure and has an inner sleeve fixedly connected inside, and tower internals are fixedly connected inside the inner sleeve.

[0006] Furthermore, the inner sleeve has a split structure.

[0007] Furthermore, the inner sleeve is composed of two sets of semi-circular shells, which are fixedly connected by bolts in the tower internals.

[0008] Furthermore, the upper end of the inner sleeve is provided with an outward flange, which is fixed between the upper flange of the tower body and the lower flange of the demister.

[0009] Further, the inner sleeve upper portion is provided with through holes, which are distributed corresponding to the medium inlet position on the tower body.

[0010] The utility model discloses beneficial effect lies in:

[0011] 1, the tower body adopts integral type structure and is provided with inner sleeve in the inside, compared with the multistage structure of traditional polyolefin monomer degassing tower, not only can avoid the leakage risk when installing multistage tower body, and installation dismounts conveniently, can reduce the time of degassing tower installation and overhaul, effectively improve the work efficiency of installation and overhaul;

[0012] 2, the inner sleeve adopts split type structure, when installing, can fix the inner sleeve with tower internals through fastener in advance, and integrally hoists and installs or integrally hoists and overhaul, only needs to remove fastener when overhauling can clean and replace tower internals in the inner sleeve, further improves the overhaul efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0013] Fig. 1 It is the three-dimensional structure schematic diagram of the utility model

[0014] Fig. 2 It is the left view of inner sleeve and tower body and demister connecting structure

[0015] Fig. 3 It is the tower internals and inner sleeve connection plan view after counterclockwise rotation 90

[0016] Among them:

[0017] 1-buffer tank, 2-reboiler, 3-tower body, 301-tower body upper flange, 4-demister, 401-demister lower flange, 5-cooler, 6-inner sleeve, 601-first half circular shell, 602-second half circular shell, 603-outer flange, 604-through hole, 7-liquid drop plate, 8-tower plate, 9-cooling water inlet, 10-cooling water outlet, 11-medium inlet. DETAILED DESCRIPTION

[0018] Exemplary embodiments of the present disclosure will be described in greater detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it is understood that the present disclosure can be embodied in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided so that the present disclosure can be more thoroughly understood, and the scope of the present disclosure can be accurately conveyed to those skilled in the art.

[0019] In the description of the utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the view direction or positional relationship, and are only for the convenience of describing the utility model, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the utility model.

[0020] In this embodiment, for ease of description, the processing direction of the sheet metal is taken as the front-to-back direction, and the width direction of the sheet metal is taken as the left-to-right direction.

[0021] like Figs. 1-3 The sleeve-type degassing tower shown includes a buffer tank 1, a reboiler 2, a tower body 3, a demister 4, a cooler 5, and an inner sleeve 6. The reboiler 2 is connected to the bottom of one side of the buffer tank 1, and the tower body 3, the demister 4, and the cooler 5 are connected to the top of the buffer tank 1 from bottom to top.

[0022] Specifically, the tower body 3 is an integral structure. The lower end of the tower body 3 is fixedly connected to the buffer tank 1 through a flange, and the upper end is provided with a tower body upper flange 301. The upper part of the tower body 3 is also provided with a medium inlet 11. The lower end of the demister 2 is provided with a demister lower flange 201. The tower body 3 and the demister 2 are fixedly connected through the tower body upper flange 301 and the demister lower flange 201. The upper and lower parts of the cooler 5 are respectively provided with a cooling water inlet 9 and a cooling water outlet 10.

[0023] The inner sleeve 6 is coaxially disposed inside the tower body 3 and is composed of a first semi-circular shell 601 and a second semi-circular shell 602. Together, they form a shell structure with a circular cross-section. Both the first semi-circular shell 601 and the second semi-circular shell 602 are provided with an outer flange 603 at their upper ends. The upper part of the inner sleeve 6 overlaps between the upper end face of the upper flange 301 of the tower body and the lower end face of the lower flange 401 of the demister through the outer flange 603. The outer flange 603 is pressed and fixed by the lower flange 401 of the demister and the upper flange 301 of the tower body, thereby fixing the inner sleeve 6. In addition, in order to facilitate the entry of the process medium, the inner sleeve 6 is also provided with through holes 604 distributed corresponding to the position of the medium inlet 11. The external medium can enter the interior of the inner sleeve 6 through the medium inlet 11 and the through holes 604.

[0024] The inner sleeve 6 is equipped with tower internals. Multiple sets of tower internals are arranged at intervals along the height direction. The two sets of tower internals that are adjacent to each other are fixedly connected to the first semi-circular shell 601 and the second semi-circular shell 602 respectively. Each set of tower internals consists of a downcomer 7 and a tower plate 8. The downcomer 7 and the tower plate 8, as well as the tower plate 8 and the first semi-circular shell 601 and the second semi-circular shell 602 are fixedly connected by bolts.

[0025] When the device is installed, the lower end of the tower body 3 is connected with the buffer tank 1 through a flange, the first semicircular shell 601 and the second semicircular shell 602 are fixedly connected through the tower plate 8, after a plurality of groups of tower internals are fixedly installed, the tower internals are hoisted into the tower body 3, when the device is installed, it is necessary to pay attention to adjusting the through hole on the inner sleeve 6 to correspond to the medium inlet 11 of the tower body 3, the outer flange 603 at the upper end of the inner sleeve 6 is overlapped at the upper end surface of the upper flange 301 of the tower body, then the demister 4 is installed, the lower flange 401 of the demister is pressed on the outer flange 603, and the lower flange 401 of the demister and the upper flange 301 of the tower body are fixed through bolts, so that the installation of the demister 4 is completed and the inner sleeve 6 is fixed, finally the cooler 5 is installed above the demister 4 in a flange connection mode; when maintenance is required, the inner sleeve 6 can be hoisted out as a whole after the demister 4 is removed, the bolts between the inner sleeve 6 and the tower plate 8 are removed, so that the inner sleeve 6 and the tower internals can be removed and cleaned and replaced.

[0026] When the device is used for polyolefin chemical production, process medium enters the inner sleeve 6 from the medium inlet 11, liquid drops along the downcomer plate 7, and the liquid and upward gas are in gas-liquid contact and mass transfer on the tower plate 8, light components such as CO, CO2, O2 and light hydrocarbon in the liquid are separated out, and the separated light components continue to flow upward and are in mass transfer with liquid-phase process medium on the previous tower plate 8, finally pass through the demister 4, are cooled by cooling water in the cooler 5, and non-condensable gas such as CO, CO2, O2 and light hydrocarbon is discharged out of the tower, so that the purpose of degassing is achieved, the gas-phase process medium is condensed into liquid in the cooler 5, passes through the demister 4, is in mass transfer with upward gas on the tower plate 8 of the inner sleeve 6, and finally falls into the buffer tank 1, the process medium in the buffer tank 1 is heated by the reboiler 2 to become gas phase and flow upward, and is in mass transfer with downward liquid-phase medium on the tower plate 8, and the gas-liquid two-phase mass transfer in the tower is carried out on the tower plate 8 in the inner sleeve 6.

[0027] The above only describes preferred embodiments of the present application, and it should be pointed out that for ordinary skilled persons in the technical field, some improvements can be made without departing from the principles of the present application, and these improvements should also be regarded as the protection scope of the present application.

Claims

1. A cartridge type degassing tower comprising a surge tank, a reboiler connected to one side of the surge tank, a tower body connected in order from below to above the surge tank, a demister, and a cooler, characterized in that, The tower body is an integral structure and internally fixedly connected with an inner sleeve, and the inner sleeve is internally fixedly connected with tower internals.

2. The bell jar degassing column of claim 1, wherein, The inner sleeve is a split structure.

3. The bell jar degassing tower of claim 2, wherein, The inner sleeve is composed of two groups of semicircular shells which are fixedly connected by the tower internals.

4. The bell-type degassing column according to claim 1 or 2 or 3, characterized in that, An outward flange is arranged on the upper end of the inner sleeve and fixed between the flange on the tower body and the lower flange of the demister.

5. The bell-type degassing column according to claim 1, characterized in that, A through hole is arranged on the upper part of the inner sleeve and corresponds to the medium inlet position on the tower body.

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