An air intake distributor and a method for laying catalyst

Abstract

The present invention relates to an air intake distributor and a method for laying catalysts. The air intake distributor comprises an upper connecting pipe, a lower connecting pipe, an intermediate cylinder and a catalyst isolator. The intermediate cylinder is assembled from a plurality of cylinder segments. The bottom of each cylinder segment is concavely provided with a groove and the top is convexly provided with a convex portion. In each of two cylinder segments adjacent to each other, the boss of the lower cylinder segment is accommodated in the groove of the upper cylinder segment and the two are connected by a plurality of first fixing members. The catalyst isolator is assembled from a plurality of isolation frames. Each of two isolation frames adjacent to each other is connected by a second fixing member. Each isolation frame is composed of a plurality of isolation racks arranged along the circumferential direction. Each of two isolation racks adjacent to each other in the circumferential direction is connected by a third fixing member. Each isolation rack is welded from a plurality of vertical flat steels and a plurality of horizontal round steels. The vertical flat steels are welded with nuts. A centering rod is installed in the nut, thereby greatly increasing the filling amount of the catalyst.

Description

Technical field

[0001] The present invention relates to the field of chemical machinery, and in particular to an air intake distributor and a method for laying a catalyst. [Background Technology]

[0002] A reaction vessel is a container used to complete physical and chemical reactions of a medium. In industrial production, especially in the chemical, pharmaceutical, fertilizer, and refining industries, reaction vessels are widely used as a pressure-bearing equipment due to process needs.

[0003] See also Figure 1 , Figure 1 A reaction vessel in the prior art is disclosed, comprising a cylinder 1', an upper head 2', a lower head 3', an upper tube sheet 4', a lower tube sheet 5' and several heat exchange tubes 6'. The upper and lower heads are respectively provided with a tube-side inlet 7' and a tube-side outlet 8', and the cylinder 1' is respectively provided with a shell-side inlet 9' and a shell-side outlet 10'. The tube-side medium is synthesis gas. In order to accelerate the chemical reaction rate of the synthesis gas, a catalyst is added to the heat exchange tube in the prior art. The defects of setting the catalyst in the heat exchange tube are: 1. The space in the heat exchange tube is limited, and the space for installing the catalyst is very small, so the catalyst filling amount is very small. In order to increase the catalyst filling amount, the more commonly used solution in the prior art is to expand the entire equipment, but this will lead to an increase in production costs, so the economy is poor; 2. If the catalyst is set in the heat exchange tube, if the local temperature is too high, it will cause the catalyst to agglomerate and fail (i.e., catalyst sintering), which is easy to affect the fluidity of the tube-side medium.

[0004] Therefore, it is necessary to provide an air intake distributor and a method for laying catalyst that solve the above technical problems. [Summary of the invention]

[0005] In order to solve the above problems, the object of the present invention is to provide an air intake distributor and a method for laying catalyst that can increase the catalyst filling amount.

[0006] To achieve the above-mentioned purpose, the technical solution adopted by the present invention is: an air intake distributor, comprising: an upper pipe, a lower pipe and an intermediate cylinder member and a catalyst isolator arranged between the upper pipe and the lower pipe, the catalyst isolator is arranged on the outside of the intermediate cylinder member, the intermediate cylinder member is assembled by a plurality of cylinder segments stacked in the up and down directions, the bottom of each cylinder segment is concavely provided with a groove, and the top is convexly provided with a convex portion, and each cylinder segment is provided with a plurality of holes for the synthesis gas to pass through, in each two adjacent cylinder segments, the boss of the lower cylinder segment is accommodated in the groove of the upper cylinder segment and the two are connected by a plurality of first fixing members, the catalyst isolator is assembled by a plurality of isolation frames stacked in the up and down directions, each two adjacent isolation frames are connected by a second fixing member, each isolation frame is composed of a plurality of isolation frames arranged along the circumferential direction, and each circumferentially adjacent isolation frames are connected by a third fixing member, each isolation frame is composed of a plurality of vertical flat steels and a plurality of horizontal round steels welded together, the vertical flat steels are welded with nuts, a centering rod is installed in the nuts, and a wire mesh is spot-welded on the outside of the entire catalyst isolator.

[0007] Preferably, an air intake distributor in the present invention is further configured as follows: the bottom of the catalyst isolation member is supported on the lower connecting pipe by a support member, and the support member and the catalyst isolation member are connected by a fourth fixing member.

[0008] Preferably, an air intake distributor in the present invention is further configured as follows: a conical basket cover is provided on the top of the catalyst separator.

[0009] Preferably, an air intake distributor in the present invention is further configured such that the second fixing member and the fourth fixing member are both connecting plates, bolts and nuts.

[0010] Preferably, an air intake distributor in the present invention is further configured as follows: the first fixing member and the third fixing member are bolts and nuts.

[0011] Preferably, an air intake distributor in the present invention is further configured as follows: one end of the centering rod is provided with a threaded section that matches the nut, and the other end of the centering rod abuts against the intermediate cylinder.

[0012] Preferably, an air intake distributor in the present invention is further configured as follows: a plurality of ladder members are provided on the inner wall of the intermediate cylinder member.

[0013] Preferably, an air intake distributor in the present invention is further configured as follows: the top of the intermediate cylinder is welded to the upper connecting pipe, and the bottom of the intermediate cylinder is connected to the lower connecting pipe via bolts and nuts.

[0014] Preferably, an air intake distributor in the present invention is further configured as follows: the catalyst separator is made of stainless steel, and the intermediate cylinder is made of high-strength steel.

[0015] Another technical solution adopted by the present invention is: a method for laying catalyst using an air intake distributor, comprising the following steps: first, installing the lowest cylinder section and the lowest isolation frame on the lower connecting pipe, and then supporting the barrel containing the catalyst on the cylinder section, and then the staff standing on the barrel will stuff the catalyst in the barrel into the gap between the heat exchange tubes on one side, and when the lowest layer of catalyst is laid, the staff will remove the barrel containing the catalyst from the cylinder section, and then assemble the second cylinder section and the second isolation frame upwards, and after the assembly is completed, the barrel containing the catalyst will be supported on the second cylinder section, and then the staff will stand on the barrel and stuff the catalyst in the barrel into the gap between the heat exchange tubes on one side to complete the laying of the second layer of catalyst, and then assemble the third cylinder section and the third isolation frame upwards, and then lay the third layer of catalyst, and so on, until the last layer of catalyst is laid.

[0016] Compared with the prior art, the present invention has the following beneficial effects: the present invention designs the air intake distributor structure into a segmented assembled structure, so that the catalyst can be set in the gap between the heat exchange tubes (i.e., in the shell side). Compared with the prior art of setting the catalyst in the heat exchange tube (i.e., in the tube side), the present invention can greatly increase the filling amount of the catalyst and avoid the problem of catalyst sintering in the prior art. The reason why the present invention designs the entire air intake distributor into a segmented assembled structure is that if it is set as an integral structure, the catalyst will not be installed in the gap between the heat exchange tubes (i.e., in the shell side). Therefore, the present invention adopts a method of installing the air intake distributor layer by layer from bottom to top and laying the catalyst layer by layer from bottom to top to solve this technical problem.

Brief Description of the Drawings

[0017] Figure 1 It is a structural schematic diagram of a reaction container in the prior art.

[0018] Figure 2 This is a schematic diagram of the main structure of the air intake distributor in the present invention.

[0019] Figure 3 Schematic diagram of the top view of the air intake distributor in the present invention.

[0020] Figure 4 for Figure 2 A partial enlarged view of point A in the middle.

[0021] Figure 5 This is a structural diagram of the catalyst barrel installed on the bottom barrel section.

[0022] Figure 6 Schematic diagram of the structure of a single isolation frame.

[0023] Figure 7 Schematic diagram of the structure of a single cylinder segment.

[0024] Figure 1 Middle: 1`, cylinder, 2`, upper head, 3`, lower head, 4`, upper tube sheet, 5`, lower tube sheet, 6`, heat exchange tube, 7`, tube side inlet, 8`, tube side outlet, 9`, shell side inlet, 10`, shell side outlet.

[0025] Figures 2 to 7 Middle: 1. Upper connecting pipe, 2. Lower connecting pipe, 3. Intermediate cylinder, 30. Cylinder section, 300. Groove, 301. Protrusion, 302. First fixing piece, 303. Bottom cylinder section, 304. Second cylinder section, 305. Third cylinder section, 31. Ladder, 4. Catalyst isolation piece, 40. Isolation frame, 400. Isolation frame, 4000. Vertical flat steel, 4001. Horizontal round steel, 4002. Nut, 4003. Centering rod, 4004. Threaded section, 41. Second fixing piece, 42. Third fixing piece, 43. Conical basket cover, 44. Support piece, 45. Fourth fixing piece, 46. Bottom isolation frame, 47. Second isolation frame, 48. Third isolation frame, 5. Material barrel. [Specific implementation method]

[0026] The following is a further detailed description of an air intake distributor and a method for laying catalysts according to the present invention through specific embodiments.

[0027] Ginseng Figures 2 to 7 As shown, an intake distributor includes: an upper pipe 1, a lower pipe 2, an intermediate cylinder 3 disposed between the upper and lower pipes 1 and 2, and a catalyst separator 4. The catalyst separator 4 is disposed on the outside of the intermediate cylinder 3. The intermediate cylinder 3 is composed of a plurality of cylinder segments 30 stacked and assembled in the vertical direction. In this embodiment, there are 11 cylinder segments 30. Each cylinder segment 30 has a recessed groove 300 at the bottom and a protrusion 301 at the top. Each cylinder segment 30 has a plurality of holes (not shown) for syngas to pass through. In each pair of adjacent cylinder segments 30, the boss 301 of the lower cylinder segment 30 is received in the recess 300 of the upper cylinder segment 30, and the two are connected by a plurality of first fixing members 302. In this embodiment, the first fixing members 302 are bolts and nuts. The inner wall of the intermediate cylinder 3 is provided with a plurality of ladder members 31 to facilitate access for workers to conduct maintenance. The top of the intermediate cylinder 3 is welded to the upper pipe 1, and the bottom of the intermediate cylinder 3 is connected to the lower pipe 2 by bolts and nuts. In this embodiment, the intermediate cylinder 3 is made of high-strength steel, so it has high structural strength.

[0028] The catalyst isolator 4 is composed of a plurality of isolation frames 40 stacked and assembled in the vertical direction. In this embodiment, the number of the isolation frames 40 is 11. The main function of the catalyst isolator 4 is to isolate the catalyst from the intermediate cylinder 3 to prevent the catalyst from clogging the holes on the intermediate cylinder 3 and affecting the flow of synthesis gas. Each two adjacent isolation frames 40 are connected by a second fixing member 41. In this embodiment, the second fixing member 41 is a connecting plate, a bolt and a nut. Each isolation frame 40 is composed of a plurality of isolation frames 400 arranged along the circumferential direction. In this embodiment, each isolation frame 40 is composed of six isolation frames 400. Each two adjacent isolation frames 400 are connected by a third fixing member 42. In this embodiment, the third fixing member 42 is a bolt and a nut. Each isolation frame 400 is welded together from several vertical flat steel bars 4000 and several horizontal round steel bars 4001. Nuts 4002 are welded to the vertical flat steel bars 4000, and a centering rod 4003 is installed within the nut 4002. One end of the centering rod 4003 is provided with a threaded section 4004 that mates with the nut 4002. The other end of the centering rod 4003 abuts the intermediate cylinder 3. The centering rod 4003 ensures concentricity between the intermediate cylinder 3 and the catalyst isolation member 4. A wire mesh (not shown) is spot-welded to the outside of the entire catalyst isolation member 4, primarily to isolate the catalyst. A conical basket cover 43 is provided on the top of the catalyst isolation member 4. The bottom of the catalyst isolation member 4 is supported on the lower connecting pipe 2 by a support member 44. The support member 44 and the catalyst isolation member 4 are connected by a fourth fixing member 45. In this embodiment, the fourth fixing member 45 comprises a connecting plate, bolts, and nuts. The catalyst isolation member 4 is made of stainless steel.

[0029] A method for laying catalyst using an air intake distributor includes the following steps: first, the lowest barrel section 303 and the lowest isolation frame 46 are installed on the lower pipe 2, and then the barrel 5 containing the catalyst is supported on the barrel section 303. Then, the staff stands on the barrel 5 and stuffs the catalyst in the barrel into the gap between the heat exchange tubes on one side. After the laying of the lowest layer of catalyst is completed, the staff removes the barrel 5 containing the catalyst from the barrel section 303, and then assembles the second barrel section 304 and the second isolation frame 47 upward. After the assembly is completed, the barrel 5 containing the catalyst is supported on the second barrel section 304. Then, the staff stands on the barrel 5 and stuffs the catalyst in the barrel into the gap between the heat exchange tubes on one side to complete the laying of the second layer of catalyst. Then, the third barrel section 305 and the third isolation frame 48 are assembled upward, and then the third layer of catalyst is laid, and so on, until the last layer of catalyst is laid.

[0030] In summary, the present invention designs the air intake distributor structure into a segmented assembly structure, and adopts a method of installing the air intake distributor layer by layer from bottom to top and laying the catalyst layer by layer from bottom to top, so that the catalyst can be set in the gap between the heat exchange tubes (i.e., in the shell side), thereby greatly increasing the catalyst filling amount and avoiding the problem of catalyst sintering in the prior art.

[0031] The above embodiments are merely illustrative of the principles and effects of the present invention, as well as some embodiments of its application, and are not intended to limit the present invention. It should be noted that a person skilled in the art can make several modifications and improvements without departing from the inventive concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention.

Claims

1. A method for laying catalyst using an air inlet distributor, characterized in that: The air intake distributor includes: an upper pipe, a lower pipe and an intermediate cylinder member and a catalyst isolator arranged between the upper pipe and the lower pipe. The catalyst isolator is arranged on the outside of the intermediate cylinder member. The intermediate cylinder member is assembled by stacking a number of cylinder sections in the up and down directions. The bottom of each cylinder section is concavely provided with a groove and the top is convexly provided with a convex portion. Each cylinder section is provided with a number of holes for the synthesis gas to pass through. In each of the two cylinder sections adjacent to each other, the boss of the lower cylinder section is accommodated in the groove of the upper cylinder section and the two are connected by a number of first fixing members. The catalyst isolator is assembled by stacking a number of isolation frames in the up and down directions. Each of the two isolation frames adjacent to each other is connected by a second fixing member. Each isolation frame is composed of a number of isolation racks arranged along the circumferential direction. The two isolation racks adjacent to each other in the circumferential direction are connected by a third fixing member. Each isolation rack is welded by a number of vertical flat steels and a number of horizontal round steels. The vertical flat steel welded It is connected with a nut, and a centering rod is installed in the nut. The outer side of the entire catalyst isolation piece is spot-welded with a wire mesh. The method includes the following steps: first, the lowest barrel section and the lowest isolation frame are installed on the lower connecting pipe, and then the barrel containing the catalyst is supported on the barrel section. Then the staff stands on the barrel and stuffs the catalyst in the barrel into the gap between the heat exchange tubes on one side. After the laying of the lowest layer of catalyst is completed, the staff removes the barrel containing the catalyst from the barrel section, and then assembles the second barrel section and the second isolation frame upward. After the assembly is completed, the barrel containing the catalyst is supported on the second barrel section. Then the staff stands on the barrel and stuffs the catalyst in the barrel into the gap between the heat exchange tubes on one side to complete the laying of the second layer of catalyst. Then, the third barrel section and the third isolation frame are assembled upward, and then the third layer of catalyst is laid, and so on, until the last layer of catalyst is laid.

2. A method for laying catalyst using an air inlet distributor as claimed in claim 1, characterized in that: The bottom of the catalyst isolation member is supported on the lower connecting pipe through a support member, and the support member and the catalyst isolation member are connected through a fourth fixing member.

3. The method for laying catalyst using an air inlet distributor according to claim 1, characterized in that: A conical basket cover is provided on the top of the catalyst separator.

4. A method for laying catalyst using an air inlet distributor as claimed in claim 2, characterized in that: The second fixing member and the fourth fixing member are both connecting plates, bolts and nuts.

5. The method for laying catalyst using an air inlet distributor according to claim 1, characterized in that: The first fixing member and the third fixing member are bolts and nuts.

6. The method for laying catalyst using an air inlet distributor according to claim 1, characterized in that: One end of the centering rod is provided with a threaded section matched with the nut, and the other end of the centering rod is in contact with the intermediate cylinder.

7. The method for laying catalyst using an air inlet distributor according to claim 1, characterized in that: A plurality of ladder members are provided on the inner wall of the middle cylinder member.

8. The method for laying catalyst using an air inlet distributor according to claim 1, characterized in that: The top of the intermediate cylinder is welded to the upper connecting pipe, and the bottom of the intermediate cylinder is connected to the lower connecting pipe via bolts and nuts.

9. The method for laying catalyst using an air inlet distributor according to claim 1, characterized in that: The catalyst isolation element is made of stainless steel, and the intermediate cylinder is made of high-strength steel.

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