CN216093566U

CN216093566U - Steam ejector applied to methanol synthesis

Info

Publication number: CN216093566U
Application number: CN202122068085.5U
Authority: CN
Inventors: 王海云; 刘海涛; 李宗学; 李海东; 白卫卫; 卢瑞波; 施天平; 李晓慧
Original assignee: Ningxia Baofeng Energy Group Co ltd
Current assignee: Ningxia Baofeng Energy Group Co ltd
Priority date: 2021-08-30
Filing date: 2021-08-30
Publication date: 2022-03-22
Anticipated expiration: 2031-08-30

Abstract

The application discloses a steam ejector applied to methanol synthesis, which removes an original external sleeve, realizes the function of ejecting steam from the bottom of a synthesis tower to a synthesis tower pipe bundle through a plurality of through holes on the pipe wall of a central pipeline, solves the resistance of the two-stage through-flow structure of the original steam ejector to the steam circulation, reduces the pressure drop of the steam, and meets the use requirements of a synthesis tower device on the steam flow rate and the heating effect; meanwhile, the arrangement of the reinforcing block can solve the problem that the connection part at the bottom of the ejector is broken due to additional torque generated by the throttling phenomenon of the pipe hole when high-pressure steam passes through; and the whole central pipeline is used as a through-flow part, so that the phenomenon that the connection part at the bottom of the ejector is broken due to the additional moment generated by the long distance between the through-flow part and a fixed point when the original steam ejector works can be further solved. The ejector simplifies the structure, reduces the number of welding seams and improves the strength and the service cycle on the premise of ensuring the working requirements of the synthetic tower device.

Description

Steam ejector applied to methanol synthesis

Technical Field

The application relates to the field of methanol synthesis tower application, in particular to a steam ejector applied to methanol synthesis.

Background

The methanol synthesis tower is a reaction pressure container for methanol synthesis, the catalyst is filled in a shell side, a tube side medium is boiler water and is communicated through an ascending tube steam drum, and the reaction temperature of the methanol synthesis tower can be controlled by utilizing the steam drum. A 2.9MPa steam injection device is arranged at the inlet at the bottom of the tube bundle and is used as a heating device for heating and reducing the catalyst before the device is driven.

The existing methanol synthesis tower steam jet device is formed by welding and assembling a stainless steel central pipe with the diameter of 25mm, a perforated cylindrical sleeve with the length of 508mm and a stainless steel sleeve with the length of 1218mm (the detailed structure is shown in figure 1). In the process of heating and reducing the catalyst, steam is introduced through an inlet of a connecting pipeline and enters a tube bundle in the synthesis tower from 12 steam outlets with the diameter of 12.7mm on the upper part of a central tube of the ejector through a perforated cylindrical sleeve outside the central tube.

When the synthetic tower is overhauled, the original steam ejector is completely damaged in the using process, and the damage is particularly shown in that the ejector is broken at the connecting flange at the bottom, and the outer sleeve of the ejector is cracked and separated from the central pipe. The steam jet device mainly has the advantages that the distance between the through-flow part and the bottom flange connecting point is long, additional moment is generated when high-pressure steam passes through, and if fluctuation exists in steam pressure, the connecting part of the steam jet device and the flange is easy to break, and the steam jet function is lost; the two-stage through-flow structure that center tube and outside sleeve formed causes steam flow's resistance big, and steam ejector structure is more complicated, and each subassembly all connects through the welding mode, and the welding seam is more, easily takes place sleeve and center tube junction fracture, loses the steam injection function.

SUMMERY OF THE UTILITY MODEL

The application provides a steam ejector for methanol synthesis has solved among the prior art traditional ejector and has easily appeared with bottom flange department fracture, outside sleeve easily split, with the problem of center tube readily releasable.

In order to solve the above technical problem, the present application provides a steam ejector for methanol synthesis, comprising:

the pipe wall of the central pipeline is provided with a plurality of through holes distributed along the radial direction, one end of the central pipeline is provided with a plug, the other end of the central pipeline is provided with a connecting pipe, threads are arranged on the outer side wall of the connecting pipe, one end of the connecting pipe penetrates through a flange fixed on a shell at the bottom of the synthetic tower and extends to one side of the flange and then is communicated with the boiler through a pipe network, and a reinforcing block is fixed at the joint of the connecting pipe and the flange.

Preferably, the central pipe is a stainless steel pipe with a diameter of 57mm and a thickness of 4 mm.

Preferably, the pipe wall of the central pipeline is provided with 84 circular through holes which are uniformly distributed in the radial direction and have the diameter of 12mm, and the through holes are 31mm in axial interval.

Preferably, the plug is a steel plug with the thickness of 12 mm.

Preferably, the sum of the lengths of the central pipe and the connecting pipe is 560mm, wherein the length of the central pipe is 509 mm.

Preferably, the number of the reinforcing blocks is three, and the three reinforcing blocks are distributed on the end face of the flange at intervals of 120 degrees.

Preferably, the reinforcing block has a thickness of 12 mm.

Compared with the prior art, the steam ejector applied to methanol synthesis that this application provided, including central pipeline, be provided with a plurality of through-holes along radial distribution on the pipe wall of central pipeline, the one end of central pipeline is provided with the end cap, the other end of central pipeline is provided with the connecting pipe, be provided with the screw thread on the lateral wall of connecting pipe, the one end of connecting pipe runs through the flange that is fixed in on the shell of synthetic tower bottom and extends to and communicate through pipe network and boiler behind one side of flange, the connecting pipe is fixed with the boss with the junction of flange.

Therefore, the ejector is applied to remove the original external sleeve, the ejection function of steam entering the synthesis tower tube bundle from the bottom of the synthesis tower through the plurality of through holes on the tube wall of the central pipeline is realized, the resistance of the two-stage through-flow structure of the original steam ejector to the steam circulation is solved, the pressure drop of the steam is reduced, and the steam flow rate and the heating effect meet the use requirements of the synthesis tower device; meanwhile, the arrangement of the reinforcing block can solve the problem that the connection part at the bottom of the ejector is broken due to additional torque generated by the throttling phenomenon of the pipe hole when high-pressure steam passes through; and the whole central pipeline is used as a through-flow part, so that the phenomenon that the connection part at the bottom of the ejector is broken due to the additional moment generated by the long distance between the through-flow part and a fixed point when the original steam ejector works can be further solved. The ejector simplifies the structure, reduces the number of welding seams and improves the strength and the service cycle of the steam ejector on the premise of ensuring the working requirements of the synthetic tower device.

Drawings

In order to more clearly explain the technical solution of the present application, the drawings needed to be used in the embodiments are briefly described below, and it is obvious to those skilled in the art that other drawings can be obtained according to the drawings without making any inventive changes.

FIG. 1 is a schematic diagram of a steam ejector for methanol synthesis according to an embodiment of the present invention;

in the figure, 1 a central pipeline, 2 through holes, 3 plugs, 4 connecting pipes, 5 flanges and 6 reinforcing blocks.

Detailed Description

In order to make those skilled in the art better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be described clearly and completely with reference to the accompanying drawings.

The core of this application is to provide a steam ejector for methyl alcohol is synthetic, can solve among the prior art traditional ejector easily appear with bottom flange department fracture, outside sleeve easily split, with the easy problem of separating of center tube.

Fig. 1 is a schematic structural diagram of a steam ejector applied to methanol synthesis according to an embodiment of the present invention, as shown in fig. 1, the steam ejector includes:

the central pipeline 1 is provided with a plurality of through-holes 2 along radial distribution on the pipe wall of the central pipeline 1, the one end of the central pipeline 1 is provided with a plug 3, the other end of the central pipeline 1 is provided with a connecting pipe 4, the outer side wall of the connecting pipe 4 is provided with threads, one end of the connecting pipe 4 penetrates through a flange 5 fixed on a shell at the bottom of the synthetic tower and extends to one side of the flange 5 to be communicated with a boiler through a pipe network, and a reinforcing block 6 is fixed at the joint of the connecting pipe 4 and the flange 5.

Specifically, a plurality of through holes 2 distributed along the radial direction are arranged on the pipe wall of the central pipe 1, steam can be sprayed through the through holes 2, and as a preferred embodiment, 6 circular through holes 84 uniformly distributed along the radial direction, spaced by 31mm along the axial direction and having a diameter of 12mm are arranged on the pipe wall of the central pipe 1, as shown in fig. 1. The plug 3 is welded and fixed in one end of the central pipe 1, and is used for sealing the end of the central pipe 1, and as a preferred embodiment, the plug 3 is a steel plug with a thickness of 12 mm. The connecting pipe 4 is communicated with the other end of the central pipeline 1, the outer side of the connecting pipe 4 is provided with threads, the flange 5 is fixed on the shell at the bottom of the synthesis tower, the inner side wall of the flange 5 is provided with mounting threads matched with the connecting pipe 4, one end of the connecting pipe 4 is screwed and penetrates through the flange 5 and then is communicated with a boiler through a pipe network during mounting, the reinforcing block 6 is welded at the joint of the connecting pipe 4 and the flange 5, can solve the problem that the connection part at the bottom of the ejector is broken due to the additional moment generated by the pipe orifice throttling phenomenon when high-pressure steam passes through, and after the ejector is installed, the central pipeline 1 is positioned at the bottom of the synthesis tower, when in use, 2.9MPa steam enters the central pipeline 1 through the pipe network and the connecting pipe 4, then injected from the bottom of the synthesis column through the through holes 2 in the central pipe 1 into the tube bundle of the synthesis column, which is not shown in the figure. The steam injection that this application embodiment provided is except that connecting pipe 4, and it is the through-flow part all, and the through-flow part is the overall design.

As a preferred embodiment, the central tube 1 can be a stainless steel tube with a diameter of 57mm and a thickness of 4 mm. As a preferred embodiment, the sum of the lengths of the central tube 1 and the connection tube 4 may be designed to be 560mm, wherein the length of the central tube 1 is 509 mm. The problem that the joint of the connecting pipe 4 and the flange 5 is broken due to the fact that the additional moment generated by the fact that the distance between the through flow part and the fixed point is long when the original steam ejector works can be solved, in order to improve the connection stability and firmness between the connecting pipe 4 and the flange 5, as a preferred embodiment, the number of the reinforcing blocks 6 is three, and the three reinforcing blocks 6 are distributed on the end face of the flange 5 at intervals of 120 degrees. In a preferred embodiment, the reinforcing blocks 6 have a thickness of 12mm and a thickness of 12mm, i.e. after screwing the connecting pipe 4 into the bottom flange 5, the end faces of the connecting pipe 4 and the flange 5 are reinforced by welding with three reinforcing blocks 6 having a thickness of 12 mm.

According to the steam ejector applied to methanol synthesis, the original external sleeve is removed, the ejection function of steam entering a pipe bundle of a synthesis tower from the bottom of the synthesis tower to the rear is realized through the plurality of through holes in the pipe wall of the central pipeline, the resistance of the two-stage through-flow structure of the original steam ejector to steam circulation is solved, the pressure drop of the steam is reduced, and the steam flow rate and the heating effect meet the use requirements of a synthesis tower device; meanwhile, the arrangement of the reinforcing block can solve the problem that the connection part at the bottom of the ejector is broken due to additional torque generated by the throttling phenomenon of the pipe hole when high-pressure steam passes through; and the whole central pipeline is used as a through-flow part, so that the phenomenon that the connection part at the bottom of the ejector is broken due to the additional moment generated by the long distance between the through-flow part and a fixed point when the original steam ejector works can be further solved. The ejector simplifies the structure, reduces the number of welding seams and improves the strength and the service cycle of the steam ejector on the premise of ensuring the working requirements of the synthetic tower device.

Other embodiments of the present application will be apparent to those skilled in the art from consideration of the specification and practice of the application disclosed herein. This application is intended to cover any variations, uses, or adaptations of the utility model following, in general, the principles of the application and including such departures from the present disclosure as come within known or customary practice in the art to which the utility model pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope of the disclosure being indicated by the following claims.

It will be understood that the present application is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The above-described embodiments of the present application do not limit the scope of the present application.

Claims

1. A steam injector for use in methanol synthesis comprising:

2. The steam ejector applied to methanol synthesis of claim 1, wherein the central pipe is a stainless steel pipe with a diameter of 57mm and a thickness of 4 mm.

3. The steam ejector for methanol synthesis as claimed in claim 1, wherein the pipe wall of the central pipe is provided with 84 circular through holes which are uniformly distributed in the radial direction and have the diameter of 12mm, and the through holes are provided with 6 circular through holes which are uniformly distributed in the radial direction and have the axial interval of 31 mm.

4. The steam injector for methanol synthesis according to claim 1, wherein the plug is a steel plug having a thickness of 12 mm.

5. The steam ejector for methanol synthesis according to claim 1, wherein the sum of the length of the central pipe and the connecting pipe is 560mm, and wherein the length of the central pipe is 509 mm.

6. The steam ejector for methanol synthesis as claimed in claim 1, wherein the number of the reinforcing blocks is three, and the three reinforcing blocks are distributed at intervals of 120 degrees on the end face of the flange.

7. The steam ejector for methanol synthesis according to claim 6, wherein the reinforcing block has a thickness of 12 mm.