A wellhead vacuum transition box

Abstract

The present invention belongs to the technical field of stable isotope separation equipment, and particularly relates to a wellhead vacuum transition box. It includes a transition box body. A first flange is provided at the upper end of the transition box body, and a second flange is provided at the lower end of the transition box body. A number of through holes for a rectification column to pass through and a number of transition holes are correspondingly provided on both the first flange and the second flange. A number of nitrogen output pipes, a number of liquid nitrogen input pipes, a number of feed pipes, a number of discharge pipes and a number of through members are further provided on the first flange. A heating tape is bound to each of the number of through members. The provision of a number of nitrogen output pipes, a number of liquid nitrogen input pipes, a number of feed pipes, a number of discharge pipes and a number of through members on the first flange enables the exchange of pipelines inside and outside the vacuum cover while ensuring the sealing performance, effectively guaranteeing the heat insulation inside the tower. The heating tapes are bound to the through members, playing a role in maintaining a constant temperature and being able to avoid the problem of reduced sealing performance between the cable and the through member caused by thermal expansion and contraction.

Description

Technical Field

[0001] The present invention belongs to the technical field of stable isotope separation equipment, and particularly relates to a wellhead vacuum transition box. Background Art

[0002] In the rectification of stable isotopes, the production technology has low temperature, low separation coefficient, and a high number of theoretical plates. To avoid interference from external environment and other factors, the rectification column is usually arranged in a deep well. The rectification column adopts multi-layer adiabatic insulation, and there is a vacuum cover outside to maintain the internal vacuum. The power supply line of the heater, the control line of the resistance instrument, the liquid nitrogen input pipe, the nitrogen output pipe, and the carbon monoxide feed and discharge pipes inside the rectification column all need to be led outside the column. However, when these pipelines pass through the outside or inside of the column, they usually destroy the vacuum degree inside the column, thereby affecting the heat insulation and seriously affecting the operation of low-temperature rectification. Summary of the Invention

[0003] In view of the problems existing in the above-mentioned prior art, the present invention provides a wellhead vacuum transition box, and specifically discloses the following technical solutions:

[0004] A wellhead vacuum transition box includes a transition box body. A first flange for connecting an upper vacuum cover is provided at the upper end of the transition box body, and a second flange for connecting a lower vacuum cover is provided at the lower end of the transition box body. A plurality of through holes for the rectification column to pass through and a plurality of transition holes are correspondingly provided on both the first flange and the second flange. A plurality of nitrogen output pipes, a plurality of liquid nitrogen input pipes, a plurality of feed pipes, a plurality of discharge pipes, and a plurality of through members for the cables to pass through are further provided on the first flange. A heating tape is bound to each of the plurality of through members, and a plurality of vacuum connection flanges are communicated with the side wall of the transition box body.

[0005] Further, bolt holes are provided on the periphery of both the first flange and the second flange. The first flange is connected to the upper vacuum cover through fixing bolts, and the second flange is connected to the lower vacuum cover through fixing bolts.

[0006] Further, the nitrogen output pipes, the liquid nitrogen input pipes, the feed pipes, and the discharge pipes all penetrate through the first flange and are welded to the first flange.

[0007] Further, the first flange is a vacuum cover flange, and the second flange is a vacuum sleeve flange.

[0008] Further, the through members are welded to the bottom end of the first flange and communicate with the upper part of the first flange.

[0009] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0010] The transition box of the present invention is connected to the upper vacuum hood and the lower vacuum hood of the rectification column through the first flange and the second flange at both ends respectively. The first flange is provided with a plurality of nitrogen output pipes, a plurality of liquid nitrogen input pipes, a plurality of feed pipes, a plurality of discharge pipes, and a plurality of through members for cables to pass through, so as to realize the exchange of pipelines inside and outside the vacuum hood while ensuring the sealing performance and vacuum degree, and effectively ensure the heat insulation inside the tower; heating tapes are bound to all the through members, and the heating tapes play a role in maintaining a constant temperature, which can avoid the problem of reduced sealing performance between the cable and the through member caused by the thermal expansion and contraction of the through member. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0012] Figure 2 It is a side view of the present invention.

[0013] 1 - Transition box body, 2 - First flange, 3 - Second flange, 4 - Nitrogen output pipe, 5 - Liquid nitrogen input pipe, 6 - Through member, 7 - Vacuum connection flange, 8 - Fixing bolt, 9 - Transition hole, 10 - Rectification column. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0014] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0015] Refer to Figure 1-2 , a wellhead vacuum transition box, including a transition box body 1. A first flange 2 for connecting the upper vacuum hood is provided at the upper end of the transition box body 1, and a second flange 3 for connecting the lower vacuum hood is provided at the lower end of the transition box body 1. A plurality of through holes for the rectification column 10 to pass through and a plurality of transition holes 9 are correspondingly provided on both the first flange 2 and the second flange 3. A plurality of nitrogen output pipes 4, a plurality of liquid nitrogen input pipes 5, a plurality of feed pipes, a plurality of discharge pipes, and a plurality of through members 6 for cables to pass through are further provided on the first flange 2. Heating tapes are bound to all the through members 6. A plurality of vacuum connection flanges 7 are communicated with the side wall of the transition box body 1, and the vacuum connection flanges 7 can be connected to a vacuum pipe and a vacuum pump, so as to evacuate the inside of the vacuum hood.

[0016] The heater power cord and the resistor instrument control line outside the tower can enter the tower through the penetrator 6, and pass through the transition hole 9 to penetrate the transition box and be connected to the heating mechanism at the bottom of the rectification tower. The heating tape on the penetrator 6 plays a role in maintaining a constant temperature, which can ensure that the temperature of the penetrator 6 is maintained between 10°C and 30°C, thus effectively avoiding the problem of reduced sealing performance between the cable and the penetrator 6 caused by the thermal expansion and contraction of the penetrator 6.

[0017] In this embodiment, the feed pipe and the discharge pipe are provided mainly for realizing the exchange of materials inside and outside the tower.

[0018] In this embodiment, bolt holes are provided on the peripheries of both the first flange 2 and the second flange 3. The first flange 2 is connected to the upper vacuum hood through the fixing bolts 8, and the second flange 3 is connected to the lower vacuum hood through the fixing bolts 8, thus facilitating installation and disassembly.

[0019] In this embodiment, the nitrogen output pipe 4, the liquid nitrogen input pipe 5, the feed pipe, and the discharge pipe all penetrate through the first flange 2 and are welded to the first flange 2. The nitrogen output pipe 4 and the liquid nitrogen input pipe 5 have joints at both the upper end (inside the tower) and the lower end (outside the tower) of the first flange 2, thus facilitating the connection of the corresponding hoses.

[0020] In this embodiment, the first flange 2 is a vacuum hood flange, and the second flange 3 is a vacuum sleeve flange.

[0021] In this embodiment, the surface roughness of both the first flange and the second flange reaches Ra3.2 - 1.6μm.

[0022] In this embodiment, the penetrator 6 is welded to the bottom end of the first flange 2 and is in communication with the upper part of the first flange 2.

[0023] As described above, it is only a preferred embodiment of the present invention, and does not impose any limitation on the technical scope of the present invention. Therefore, any minor modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention still belong to the scope of the technical solution of the present invention.

Claims

1. A wellhead vacuum transition box, characterized in that, It includes a transition box body. A first flange for connecting an upper vacuum hood is provided at the upper end of the transition box body. A second flange for connecting a lower vacuum hood is provided at the lower end of the transition box body. A number of through holes for a rectifying column to pass through and a number of transition holes are correspondingly provided on both the first flange and the second flange. A number of nitrogen output pipes, a number of liquid nitrogen input pipes, a number of feed pipes, a number of discharge pipes, and a number of through members for cables to pass through are further provided on the first flange. A tracing heating tape is bound to each of the through members. A number of vacuum connection flanges are communicated with the side wall of the transition box body; Bolt holes are provided on the periphery of both the first flange and the second flange. The first flange is connected to the upper vacuum hood through fixing bolts, and the second flange is connected to the lower vacuum hood through fixing bolts; The nitrogen output pipe, the liquid nitrogen input pipe, the feed pipe, and the discharge pipe all penetrate through the first flange and are welded to the first flange.

2. The wellhead vacuum transition box according to claim 1, characterized in that, The first flange is a vacuum hood flange, and the second flange is a vacuum sleeve flange.

3. The wellhead vacuum transition box according to claim 1, wherein, The through member is welded to the bottom end of the first flange and is communicated with the upper part of the first flange.

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