SCR reactor inlet pipe assembly tool and method

Abstract

The invention provides an SCR reactor inlet pipe assembly tool and method. First outward-extending rods, second outward-extending rods and third outward-extending rods are symmetrically fixed to the outer wall of a tool stand column in pairs. First flange plates are respectively fixed at the other ends of the first overhanging rod, the second overhanging rod and the third overhanging rod; the first flange plates are used for being matched with inlet pipe flanges; the distances from the outer end faces of the inlet pipe flanges of the first inlet pipe, the second inlet pipe and the third inlet pipe in the same row to the longitudinal center line of the cylinder are C1, B1 and A1 respectively; the first overhanging rod, the second overhanging rod and the third overhanging rod are correspondingly connected with a first inlet pipe, a second inlet pipe and a third inlet pipe respectively; the lengths of the first overhanging rod, the second overhanging rod and the third overhanging rod are C, B and A respectively; wherein C1 + C = B1 + B = A1 + A.

Description

Technical Field

[0001] The present invention belongs to the technical field of SCR reactor assembly, and mainly relates to an SCR reactor inlet pipe assembly tooling and method. Background Art

[0002] As a professional manufacturer of marine diesel engines, it is particularly important for our company to study how to use NOx emission control technology to reduce the NOx emissions of marine diesel engines. The SCR treatment technology has become a promising NOx emission treatment method for marine diesel engines because of its advantages such as not changing the structure of the diesel engine body, high denitrification efficiency, good economy, and wide applicable temperature range. Therefore, the company independently developed an SCR reactor. The SCR reactor in this system has a pipe system sealing structure, and the inlet pipe of the SCR reactor is connected to the soot blowing pipe inside the cylinder body, and is connected to each pipe system outside the cylinder body, and finally connected to the buffer tank. The inlet pipe connects the internal and external parts of the reactor cylinder body, realizing the cleaning function of the catalyst block. Therefore, the assembly positioning dimensions of the inlet pipe have very high requirements, and a special tooling needs to be designed to ensure the dimensional accuracy and improve the assembly efficiency at the same time. Summary of the Invention

[0003] To solve the above technical problems, the object of the present invention is to provide an SCR reactor inlet pipe assembly tooling and method. This assembly tooling can facilitate the operator to draw lines and align on the platform, ensure that each row of pipe systems is in a straight line, ensure that the center lines of the three rows of pipe systems coincide with the ground sample line, and at the same time ensure the distance from each pipe flange to the center of the cylinder body. The assembly through the tooling ensures the positioning dimensions of each nozzle on the soot blowing pipe, and also meets the smooth assembly of the external buffer tank pipe system, ensuring the normal operation of the reactor soot blowing system.

[0004] To achieve the above technical features, the object of the present invention is realized as follows: An SCR reactor inlet pipe assembly tooling includes a tooling column. On the outer wall of the tooling column, a first outrigger, a second outrigger, and a third outrigger are symmetrically fixed in pairs at the center; the other ends of the first outrigger, the second outrigger, and the third outrigger are respectively fixed with a first flange plate, and the first flange plate is used to cooperate with the inlet pipe flange. The distances from the outer end faces of the inlet pipe flanges of the first inlet pipe, the second inlet pipe, and the third inlet pipe in the same row to the longitudinal center line of the cylinder body are C1, B1, and A1 respectively; The first outrigger, the second outrigger, and the third outrigger are respectively connected to the first inlet pipe, the second inlet pipe, and the third inlet pipe; The lengths of the first outrigger, the second outrigger, and the third outrigger are C, B, and A respectively; Wherein, C1 + C = B1 + B = A1 + A.

[0005] Preferably, the tooling column is cut from channel steel material.

[0006] Preferably, the first extension rod includes a first central plate, and first side plates are fixedly paired at the middle parts of the two outer walls of the first central plate. After the combination of the first central plate and the first side plates, a cross-shaped cross-section is formed, and the center of the first flange plate coincides with the center of the cross-shaped cross-section.

[0007] Preferably, the second extension rod includes a second central plate, and second side plates are fixedly paired at the middle parts of the two outer walls of the second central plate. After the combination of the second central plate and the second side plates, a cross-shaped cross-section is formed, and the center of the first flange plate coincides with the center of the cross-shaped cross-section.

[0008] Preferably, the third extension rod includes a third central plate, and third side plates are fixedly paired at the middle parts of the two outer walls of the third central plate. After the combination of the third central plate and the third side plates, a cross-shaped cross-section is formed, and the center of the first flange plate coincides with the center of the cross-shaped cross-section.

[0009] Preferably, the heights of the center lines of the first extension rod, the second extension rod, and the third extension rod from the transverse center line of the cylinder are H3, H2, and H1 respectively, and are equal to the heights of the center lines of the first inlet pipe, the second inlet pipe, and the third inlet pipe from the transverse center line of the cylinder.

[0010] Preferably, uniformly arranged flange holes are machined on the first flange plate.

[0011] Preferably, the first extension rod, the second extension rod, and the third extension rod are respectively cut from plates.

[0012] On the other hand, the present invention provides a method for assembling the inlet pipes of an SCR reactor. The method is realized by using the above-mentioned SCR reactor inlet pipe assembly tooling, and includes the following steps: Step 1, determining the installation height dimension of the inlet pipes: According to the design drawings of the SCR reactor, determine the height dimensions H3, H2, and H1 of the center lines of the first inlet pipe, the second inlet pipe, and the third inlet pipe from the transverse center line of the cylinder respectively; Step 2, determining the outer extension installation dimension of the outer end face of the inlet pipe flange: According to the design drawings of the SCR reactor, determine the distance dimensions C1, B1, and A1 of the outer end faces of the inlet pipe flanges of the first inlet pipe, the second inlet pipe, and the third inlet pipe from the longitudinal center line of the cylinder respectively; Step 3, determining the length dimensions of the first extension rod, the second extension rod, and the third extension rod: According to the dimensions C1, B1, and A1 calculated in Step 2, determine the length dimensions C, B, and A of the first extension rod, the second extension rod, and the third extension rod, so that C1 + C = B1 + B = A1 + A; Step 4, welding and fixing of the first extension rod, the second extension rod and the third extension rod: According to the dimensions of H3, H2 and H1 determined in Step 1, weld the first extension rod, the second extension rod and the third extension rod in pairs symmetrically about the center on the tooling column, and ensure that the center heights of the three from the center of the tooling column are H3, H2 and H1 respectively; Step 5, welding and fixing of the first flange plate: After the first extension rod, the second extension rod and the third extension rod are fixed, weld the first flange plate to the outer end faces of the first extension rod, the second extension rod and the third extension rod respectively, and keep their centers coincident; Step 6, fixed installation of the first inlet pipe, the second inlet pipe and the third inlet pipe: Respectively fix and install the inlet pipe flanges of the single first inlet pipe, the second inlet pipe and the third inlet pipe on the first flange plates of the first extension rod, the second extension rod and the third extension rod through flange bolts; Step 7, determination of the SCR reactor assembly ground line: Mark the ground line according to the assembly dimensions of the SCR reactor, draw the center lines of the inlet flange, the cylinder end, the inlet pipe center, the outlet flange and the buffer tank of the reactor, and hoist the SCR reactor onto the platform so that each part coincides with the ground line; Step 8, welding and installation of the first inlet pipe, the second inlet pipe and the third inlet pipe to the SCR reactor: Align the tooling column assembled in Step 6 with the ground line, then extend the first inlet pipe, the second inlet pipe and the third inlet pipe into the SCR reactor to a fixed set depth, fix the tooling column, carry out tack welding of the first inlet pipe, the second inlet pipe and the third inlet pipe to the SCR reactor, and ensure that the inspection dimensions are qualified.

[0013] Preferably, there are three rows of inlet pipes provided on the SCR reactor, including the first row of inlet pipe systems, the second row of inlet pipe systems and the third row of inlet pipe systems respectively, and the first row of inlet pipe systems, the second row of inlet pipe systems and the third row of inlet pipe systems all respectively include the first inlet pipe, the second inlet pipe and the third inlet pipe arranged in pairs; In Step 8, after the tack welding of the first row of inlet pipe systems is completed, repeat Step 6 and Step 8 to complete the welding and installation of all the remaining inlet pipes; In Step 8, during the positioning of the tooling column, ensure that the center height of the tooling column coincides with the longitudinal center line height of the cylinder of the SCR reactor.

[0014] The present invention has the following beneficial effects: 1. Under the action of the SCR reactor inlet pipe tooling of the present invention, the assembly assembly of the SCR reactor becomes more efficient. Especially based on the experience of using the tooling for this model, the inlet pipe tooling for all models is designed and manufactured, ensuring the assembly accuracy of the pipe systems of each model and further improving the assembly efficiency of the product.

[0015] 2. The tooling of the present invention is simple to manufacture, light in weight and convenient to use. This tooling also provides strong protection for the personal safety of assembly operators. It can be said that this tooling solves the problem of mass production of products.

[0016] 3. The present invention has a simple structure but complete functions. It can complete the assembly of the three rows of inlet pipes of the SCR reactor. The tooling is simple, light, low in manufacturing cost and convenient to use. Not only is the assembly efficiency higher, but the assembly dimensional accuracy is also higher. At the same time, it effectively guarantees the total assembly quality of the reactor.

[0017] 4. According to the dimension from the flange surface of the inlet pipe to the center, the dimension differences of each flange surface are calculated. Then, based on the dimension differences, the length dimensions of each support rod are designed. Then, the inlet pipe tooling drawing is prepared, and the tooling plate and tooling flange parts are laser cut. The position dimensions of the tooling plate and the flange holes are ensured by laser. The channel steel is obtained, and the finished tooling is welded and assembled according to the drawing. The flange end face and height dimensions are checked to be qualified. The tooling flange and the inlet pipe flange are connected by bolts, thus fixing each inlet pipe, ensuring the assembly accuracy and improving the efficiency. Description of the Drawings

[0018] The following further describes the present invention in conjunction with the drawings and embodiments.

[0019] Figure 1 It is a state diagram of the use process of the assembly tooling of the present invention.

[0020] Figure 2 (a) and (b) are the front views of the first center plate and the first side plate of the present invention.

[0021] Figure 3 (a) and (b) are the front views of the second center plate and the first side plate of the present invention.

[0022] Figure 4 (a) and (b) are the front views of the third center plate and the first side plate of the present invention.

[0023] Figure 5 It is a side view of the installation and arrangement of the first flange plate on the first outer extension rod of the present invention.

[0024] Figure 6 It is the front view of the first flange plate of the present invention.

[0025] Figure 7 It is the side view of the first flange plate of the present invention.

[0026] Figure 8This is the front view of the SCR reactor of the present invention.

[0027] Figure 9 This is the side sectional view of the SCR reactor of the present invention.

[0028] Figure 10 This is the top view of the SCR reactor of the present invention.

[0029] Figure 11 This is the three-dimensional view of the SCR reactor of the present invention.

[0030] In the figure: tooling column 1, first extension rod 2, second extension rod 3, third extension rod 4, first flange plate 5, inlet pipe flange 6, first inlet pipe 7, second inlet pipe 8, third inlet pipe 9, SCR reactor 10, first row of inlet pipe systems 11, second row of inlet pipe systems 12, third row of inlet pipe systems 13, longitudinal center line of the cylinder 14, inlet flange 15, end face line of the SCR reactor cylinder 16, transverse center line of the cylinder 17; First center plate 201, first side plate 202; Second center plate 301, second side plate 302; Third center plate 401, third side plate 402; Flange hole 501. Detailed implementation manners

[0031] The following further describes the implementation manners of the present invention with reference to the accompanying drawings.

[0032] Example 1: Refer to Figures 1-10 , a tooling for assembling the inlet pipes of an SCR reactor, including a tooling column 1. On the outer wall of the tooling column 1, the first extension rod 2, the second extension rod 3, and the third extension rod 4 are symmetrically fixed in pairs at the center. The other ends of the first extension rod 2, the second extension rod 3, and the third extension rod 4 are respectively fixed with a first flange plate 5, and the first flange plate 5 is used to cooperate with the inlet pipe flange 6. The distances from the outer end faces of the inlet pipe flanges 6 of the first inlet pipe 7, the second inlet pipe 8, and the third inlet pipe 9 in the same row to the longitudinal center line 14 of the cylinder are C1, B1, and A1 respectively. The first extension rod 2, the second extension rod 3, and the third extension rod 4 are respectively connected to the first inlet pipe 7, the second inlet pipe 8, and the third inlet pipe 9. The lengths of the first extension rod 2, the second extension rod 3, and the third extension rod 4 are C, B, and A respectively. Among them, C1 + C = B1 + B = A1 + A. By using the inlet pipe assembly tooling of the present invention, it can ensure that during the subsequent assembly process of the first inlet pipe 7, the second inlet pipe 8, and the third inlet pipe 9, on the same row, the installation dimension accuracy requirements are met, and at the same time, the outer extension length dimension accuracy requirements of the first inlet pipe 7, the second inlet pipe 8, and the third inlet pipe 9 are satisfied. It avoids the defect that the outer extension length cannot be well controlled during the traditional installation process.

[0033] Furthermore, the tooling column 1 is cut from channel steel. By using channel steel for cutting, the cost is reduced and its installation structure is simplified.

[0034] Furthermore, the first extension rod 2 includes a first central plate 201. On the middle parts of the two outer walls of the first central plate 201, first side plates 202 are fixedly arranged in pairs. After the combination of the first central plate 201 and the first side plates 202, a cross-shaped cross-section is formed, and the center of the first flange plate 5 coincides with the center of the cross-shaped cross-section. Through the above-mentioned first extension rod 2, it is convenient to fixedly install the first inlet pipe 7 subsequently.

[0035] Furthermore, the second extension rod 3 includes a second central plate 301. On the middle parts of the two outer walls of the second central plate 301, second side plates 302 are fixedly arranged in pairs. After the combination of the second central plate 301 and the second side plates 302, a cross-shaped cross-section is formed, and the center of the first flange plate 5 coincides with the center of the cross-shaped cross-section. Through the above-mentioned second extension rod 3, it is convenient to fixedly install the second inlet pipe 8 subsequently.

[0036] Furthermore, the third extension rod 4 includes a third central plate 401. On the middle parts of the two outer walls of the third central plate 401, third side plates 402 are fixedly arranged in pairs. After the combination of the third central plate 401 and the third side plates 402, a cross-shaped cross-section is formed, and the center of the first flange plate 5 coincides with the center of the cross-shaped cross-section. Through the above-mentioned third extension rod 4, it is convenient to fixedly install the third inlet pipe 9 subsequently.

[0037] Furthermore, the heights of the center lines of the first extension rod 2, the second extension rod 3 and the third extension rod 4 from the transverse center line 17 of the cylinder are H3, H2 and H1 respectively, and are equal to the heights of the center lines of the first inlet pipe 7, the second inlet pipe 8 and the third inlet pipe 9 from the transverse center line 17 of the cylinder.

[0038] Furthermore, uniformly arranged flange holes 501 are machined on the first flange plate 5. Through the above-mentioned flange holes 501, it is convenient to fixedly install the inlet pipe flange 6 subsequently.

[0039] Furthermore, the first extension rod 2, the second extension rod 3 and the third extension rod 4 are all cut from plates. By being made of the above-mentioned materials, the manufacturing process is simplified and the manufacturing cost is reduced.

[0040] Embodiment 2: An SCR reactor inlet pipe assembly method includes the following steps: Step 1, determining the installation height dimension of the inlet pipe: According to the design drawings of the SCR reactor, determine the height dimensions H3, H2, and H1 of the centerlines of the first inlet pipe 7, the second inlet pipe 8, and the third inlet pipe 9 from the transverse centerline 17 of the cylinder body respectively; Step 2, determination of the outer extension installation dimensions of the outer end faces of the inlet pipe flanges 6: According to the design drawings of the SCR reactor, determine the distance dimensions C1, B1, and A1 of the outer end faces of the inlet pipe flanges 6 of the first inlet pipe 7, the second inlet pipe 8, and the third inlet pipe 9 from the longitudinal centerline 14 of the cylinder body respectively; Step 3, determination of the length dimensions of the first extension rod 2, the second extension rod 3, and the third extension rod 4: According to the dimensions C1, B1, and A1 calculated in Step 2, determine the length dimensions C, B, and A of the first extension rod 2, the second extension rod 3, and the third extension rod 4, so that C1 + C = B1 + B = A1 + A; Step 4, welding and fixing of the first extension rod 2, the second extension rod 3, and the third extension rod 4: According to the dimensions H3, H2, and H1 determined in Step 1, symmetrically weld the first extension rod 2, the second extension rod 3, and the third extension rod 4 in pairs on the tooling column 1, and ensure that the center heights of the three from the center of the tooling column 1 are H3, H2, and H1 respectively; Step 5, welding and fixing of the first flange plate 5: After the first extension rod 2, the second extension rod 3, and the third extension rod 4 are fixed, weld the first flange plate 5 to the outer end faces of the first extension rod 2, the second extension rod 3, and the third extension rod 4 respectively, and keep their centers coincident; Step 6, fixed installation of the first inlet pipe 7, the second inlet pipe 8, and the third inlet pipe 9: Respectively fix and install the inlet pipe flanges 6 of the single first inlet pipe 7, the second inlet pipe 8, and the third inlet pipe 9 on the first flange plates 5 of the first extension rod 2, the second extension rod 3, and the third extension rod 4 through flange bolts; Step 7, determination of the assembly ground line of the SCR reactor: According to the assembly dimensions of the SCR reactor 10, draw a ground line, draw the centerlines of the inlet flange 15, the cylinder body end, the inlet pipe center, the outlet flange, and the buffer tank of the reactor, and hoist the SCR reactor 10 onto the platform so that each part coincides with the ground line; Step 8, welding and installation of the first inlet pipe 7, the second inlet pipe 8, and the third inlet pipe 9 to the SCR reactor 10: Align the assembled tooling column 1 with the ground sample line in Step 6. Then, insert the first inlet pipe 7, the second inlet pipe 8, and the third inlet pipe 9 into the SCR reactor 10 to a fixed set depth, and fix the tooling column 1. Perform tack welding on the first inlet pipe 7, the second inlet pipe 8, and the third inlet pipe 9 with the SCR reactor 10, and ensure that the inspection dimensions are qualified.

[0041] Example 3: In this example, a total of three rows of inlet pipes are provided on the SCR reactor 10, including the first row of inlet pipe systems 11, the second row of inlet pipe systems 12, and the third row of inlet pipe systems 13, and the first row of inlet pipe systems 11, the second row of inlet pipe systems 12, and the third row of inlet pipe systems 13 each include the first inlet pipe 7, the second inlet pipe 8, and the third inlet pipe 9 arranged in pairs; In Step 8, after the tack welding of the first row of inlet pipe systems 11 is completed, repeat Step 6 and Step 8 to complete the installation and welding of all the remaining inlet pipes; In Step 8, during the positioning process of the tooling column 1, ensure that the center height of the tooling column 1 coincides with the height of the longitudinal center line 14 of the cylinder of the SCR reactor 10.

[0042] Among them, when determining the installation positions of the first row of inlet pipe systems 11, the second row of inlet pipe systems 12, and the third row of inlet pipe systems 13, the distance dimension between the inlet flange 15 and the end face line 16 of the SCR reactor cylinder is D2, the distance between the end face line 16 of the SCR reactor cylinder and the first row of inlet pipe systems 11 is D3, the distance between the first row of inlet pipe systems 11 and the second row of inlet pipe systems 12 is D1, and the distance between the second row of inlet pipe systems 12 and the third row of inlet pipe systems 13 is D1; the longitudinal position of the tooling column 1 is determined by the above dimensions.

Claims

1. An SCR reactor inlet pipe assembly tooling, characterized in that It includes a tooling column (1), and a first extension rod (2), a second extension rod (3) and a third extension rod (4) are symmetrically and respectively fixed in pairs on the outer wall of the tooling column (1); the other ends of the first extension rod (2), the second extension rod (3) and the third extension rod (4) are respectively fixed with a first flange plate (5), and the first flange plate (5) is used to cooperate with the inlet pipe flange (6). The distances from the outer end faces of the inlet pipe flanges (6) of the first inlet pipe (7), the second inlet pipe (8) and the third inlet pipe (9) in the same column to the longitudinal center line (14) of the cylinder are C1, B1 and A1 respectively. The first extension rod (2), the second extension rod (3) and the third extension rod (4) are respectively connected to the first inlet pipe (7), the second inlet pipe (8) and the third inlet pipe (9). The lengths of the first extension rod (2), the second extension rod (3) and the third extension rod (4) are C, B and A respectively. Wherein, C1 + C = B1 + B = A1 + A.

2. The assembly tooling for the SCR reactor inlet pipe according to claim 1, wherein: The tooling column (1) is made by cutting a channel steel material.

3. The assembly tooling for the SCR reactor inlet pipe according to claim 1, characterized in that: The first extension rod (2) includes a first central plate (201), and first side plates (202) are symmetrically and respectively fixed in pairs at the middle parts of the two outer walls of the first central plate (201). After the first central plate (201) and the first side plates (202) are combined, they form a cross-sectional shape, and the center of the first flange plate (5) coincides with the center of the cross-sectional shape.

4. The assembling tooling for the inlet pipe of an SCR reactor according to claim 1, characterized in that: The second extension rod (3) includes a second central plate (301), and second side plates (302) are symmetrically and respectively fixed in pairs at the middle parts of the two outer walls of the second central plate (301). After the second central plate (301) and the second side plates (302) are combined, they form a cross-sectional shape, and the center of the first flange plate (5) coincides with the center of the cross-sectional shape.

5. The assembly tooling for the SCR reactor inlet pipe according to claim 1, characterized in that: The third extension rod (4) includes a third central plate (401), and third side plates (402) are symmetrically and respectively fixed in pairs at the middle parts of the two outer walls of the third central plate (401). After the third central plate (401) and the third side plates (402) are combined, they form a cross-sectional shape, and the center of the first flange plate (5) coincides with the center of the cross-sectional shape.

6. The assembly tooling for the inlet pipe of an SCR reactor according to claim 1, characterized in that: The heights of the center lines of the first extension rod (2), the second extension rod (3) and the third extension rod (4) from the transverse center line (17) of the cylinder are H3, H2 and H1 respectively, and are equal to the heights of the center lines of the first inlet pipe (7), the second inlet pipe (8) and the third inlet pipe (9) from the transverse center line (17) of the cylinder.

7. The assembly tooling for the SCR reactor inlet pipe according to claim 1, characterized in that: Uniformly arranged flange holes (501) are machined on the first flange plate (5).

8. The assembling tooling for the SCR reactor inlet pipe according to claim 1, characterized in that: The first extension rod (2), the second extension rod (3) and the third extension rod (4) are all made by cutting plates.

9. A method for assembling the inlet pipe of an SCR reactor, characterized in that, The method is realized by using a kind of SCR reactor inlet pipe assembly tooling described in any one of claims 1 - 8, and includes the following steps: Step 1, determining the installation height dimension of the inlet pipe: According to the design drawing of the SCR reactor, determine the height dimensions H3, H2 and H1 of the center lines of the first inlet pipe (7), the second inlet pipe (8) and the third inlet pipe (9) from the transverse center line (17) of the cylinder respectively. Step 2, determination of the external extension installation dimensions of the inlet pipe flange (6): According to the design drawings of the SCR reactor, determine the distance dimensions C1, B1, and A1 from the outer end face of the inlet pipe flange (6) of the first inlet pipe (7), the second inlet pipe (8), and the third inlet pipe (9) to the longitudinal center line (14) of the cylinder body respectively; Step 3, determination of the length scales of the first extension rod (2), the second extension rod (3), and the third extension rod (4): According to the C1, B1, and A1 dimensions calculated in Step 2, determine the length dimensions C, B, and A of the first extension rod (2), the second extension rod (3), and the third extension rod (4), so that C1 + C = B1 + B = A1 + A; Step 4, welding and fixing of the first extension rod (2), the second extension rod (3), and the third extension rod (4): According to the H3, H2, and H1 dimensions determined in Step 1, symmetrically weld the first extension rod (2), the second extension rod (3), and the third extension rod (4) in pairs on the tooling column (1), and ensure that the center heights of the three from the center of the tooling column (1) are H3, H2, and H1 respectively; Step 5, welding and fixing of the first flange plate (5): After the first extension rod (2), the second extension rod (3), and the third extension rod (4) are fixed, weld the first flange plate (5) to the outer end faces of the first extension rod (2), the second extension rod (3), and the third extension rod (4) respectively, and keep their centers coincident; Step 6, fixed installation of the first inlet pipe (7), the second inlet pipe (8), and the third inlet pipe (9): Fix the inlet pipe flanges (6) of the single first inlet pipe (7), the second inlet pipe (8), and the third inlet pipe (9) to the first flange plates (5) of the first extension rod (2), the second extension rod (3), and the third extension rod (4) respectively through flange bolts; Step 7, determination of the assembly ground line of the SCR reactor: According to the assembly dimensions of the SCR reactor (10), draw the ground line, draw the center lines of the inlet flange (15), the cylinder body end, the inlet pipe center, the outlet flange, and the buffer tank of the reactor, and hoist the SCR reactor (10) onto the platform so that each part coincides with the ground line; Step 8, welding and assembly of the first inlet pipe (7), the second inlet pipe (8), and the third inlet pipe (9) with the SCR reactor (10): Align the tooling column (1) assembled in Step 6 with the ground line, then extend the first inlet pipe (7), the second inlet pipe (8), and the third inlet pipe (9) into the SCR reactor (10) to a fixed set depth, fix the tooling column (1), and perform tack welding on the first inlet pipe (7), the second inlet pipe (8), and the third inlet pipe (9) with the SCR reactor (10), and ensure that the inspection dimensions are qualified.

10. The method for assembling the inlet pipe of an SCR reactor according to claim 9, characterized in that, There are three columns of inlet pipes provided on the SCR reactor (10), which respectively include the first column of inlet pipe systems (11), the second column of inlet pipe systems (12), and the third column of inlet pipe systems (13), and the first column of inlet pipe systems (11), the second column of inlet pipe systems (12), and the third column of inlet pipe systems (13) each include a first inlet pipe (7), a second inlet pipe (8), and a third inlet pipe (9) arranged in pairs; In step 8, after the positioning welding of the first column of inlet pipe systems (11) is completed, repeat steps 6 and 8 to complete the welding of all the remaining inlet pipes; In step 8, during the positioning of the tooling column (1), ensure that the center height of the tooling column (1) coincides with the height of the longitudinal center line (14) of the cylinder of the SCR reactor (10).

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