CN103170773A

CN103170773A - Assembly method for ensuring equipment overall coaxiality in pressure vessel for chemical industry

Info

Publication number: CN103170773A
Application number: CN201310081715XA
Authority: CN
Inventors: 李耀平; 丁尧新
Original assignee: Shanghai Boiler Works Co Ltd
Current assignee: Shanghai Boiler Works Co Ltd
Priority date: 2013-03-14
Filing date: 2013-03-14
Publication date: 2013-06-26
Anticipated expiration: 2033-03-14
Also published as: CN103170773B

Abstract

The invention provides an assembly method for ensuring equipment overall coaxiality in a pressure vessel for chemical industry. At first, U-V-shaped grooves are processed at two ends of each tube sections to be assembled, and then reference surfaces are processed below V-shaped grooves of the U-V-shaped grooves on the inner wall of the tube sections, an axis of each tube section is simulated according to the reference surfaces of two ends of the tube section as measuring basis, and when tube sections are assembled, the axis of each tube section is located on the same straight line. According to the assembly method for ensuring equipment overall coaxiality in the pressure vessel for the chemical industry, defects of the prior art are overcome, overall coaxiality of the equipment can be ensured, assembly accuracy is improved, and product quality and manufacturing efficiency are guaranteed.

Description

Guarantee the assembly method of Whole Equipment axiality in a kind of pressure vessels for the chemical industry

Technical field

The present invention relates to guarantee in a kind of pressure vessels for the chemical industry the assembly method of Whole Equipment axiality, belong to the mounting technology field of pressure vessels for the chemical industry.

Background technology

For the large-scale tower equipment in chemical industry equipment, such as: ammonia convertor, methanol reactor etc., because the matching requirements of internals and housing are very high, housing is relatively long again, and internals are generally whole pattern and hang in housing, for guarantee internals and housing can be accurately, successfully be in place, this has just proposed very high requirement to the whole axiality of apparatus casing.

If what device housings adopted is the smithwelding structure, just relatively easy assurance of the axiality of housing so; If what device housings adopted is the plate welding structure, guarantee that the axiality of housing is just more difficult.For the large-scale tower equipment that adopts the plate welding structure, according to the conventional method, the axiality of assembling process middle shell is to control by the method that adopts measuring cylinder body circular seam unfitness of butt joint, this method can satisfy the low equipment of concentricity requirement, but the large-scale tower equipment for the plate welding structure is difficult to reach requirement.If by above method assemble and weld appropriate after, find dimension overproof, can only make up by the method for excluding weld seam and ressembling, weld, not only reprocess complex procedures, can greatly increase manufacturing cost, also can extend the manufacturing cycle of product simultaneously, impact delivery.

Summary of the invention

The technical problem to be solved in the present invention is to provide the assembly method that guarantees the Whole Equipment axiality in a kind of pressure vessels for the chemical industry, to improve assembly precision, guarantees the quality of product and makes efficient.

In order to solve the problems of the technologies described above, technical scheme of the present invention is to provide the assembly method that guarantees the Whole Equipment axiality in a kind of pressure vessels for the chemical industry, and it is characterized in that: the method is comprised of following 4 steps:

Step 1: at all shell ring two ends processing UV grooves to be assembled;

Step 2: processing datum below the double V-groove of shell ring inwall UV groove;

Step 3: as measuring basis, simulate the axis of each shell ring with the datum level at shell ring two ends;

Step 4: when assembling between shell ring, make the axis of each shell ring be positioned at same straight line.

Preferably, in described step 1, the width of datum level is 5～10mm.

Preferably, in described step 3, the method for axis of simulation shell ring is: datum level circumferentially evenly get 8 points, along circumferentially connecting in twos apart from one another by the point of three points, simulate the center of circle of datum level, the center of circle that connects two datum levels at shell ring two ends is the axis of shell ring.

The actual size that in a kind of pressure vessels for the chemical industry provided by the invention, the assembly method of assurance Whole Equipment axiality rolls according to each shell ring, to matching between each shell ring, the strict unfitness of butt joint that produces in assembling process of controlling has guaranteed that the axiality of Whole Equipment satisfies specification requirement.

Method provided by the invention has overcome the deficiencies in the prior art, can guarantee that the axiality of Whole Equipment satisfies specification requirement, has improved assembly precision, has guaranteed the quality of product and has made efficient.

Description of drawings

Fig. 1 is shell ring two ends processing UV groove and datum level schematic diagram;

Fig. 2 is that single shell ring is chosen schematic diagram in the cross section when determining least radius;

Fig. 3 is that two shell rings are chosen schematic diagram in the cross section when determining least radius;

Fig. 4 is 4 shell ring assembling schematic diagrames;

Fig. 5 is 6 shell ring assembling schematic diagrames;

Fig. 6 is 7 shell ring assembling schematic diagrames;

Description of reference numerals

The 1-UV groove; The 2-datum level.

The specific embodiment

For the present invention is become apparent, hereby with a preferred embodiment, and coordinate accompanying drawing to be described in detail below.

For guaranteeing that shell ring can satisfy the requirements such as the axiality of specification requirement regulation and linearity when the assembling, the blank size that at first will guarantee the shell ring steel plate is accurate, the parameters such as the ovality in strict control shell ring roll bending process, linearity, in addition, should guarantee as far as possible that the internal diameter size of each shell ring is identical, avoid shell ring the situation of large osculum to occur.

The assembly method that guarantees the Whole Equipment axiality in a kind of pressure vessels for the chemical industry is comprised of following 7 steps:

Step 1: as shown in Figure 1, at all shell ring two ends processing UV grooves 1 to be assembled.

Step 2: roll because shell ring adopts steel plate, can produce certain ovality, the accuracy of measuring basis during for the assembling of assurance shell ring, working width a is the datum level 2 of 5～10mm below the double V-groove of shell ring inwall UV groove 1, centering center when being used for follow-up assembling process optical measurement.

Step 3: as measuring basis, simulate the axis of each shell ring with the datum level 2 at shell ring two ends.

Method is: circumferentially evenly get 8 points at datum level 2, along circumferentially connecting in twos apart from one another by the point of three points, be about to be positioned at same diameter or connect in twos near the point of same diameter, simulate the center of circle of datum level 2, the center of circle that connects two datum levels 2 at shell ring two ends is the axis of shell ring.

In conjunction with Fig. 4, can adopt the form of 2+2 during 4 shell ring assemblings; In conjunction with Fig. 5, can adopt the form of 4+2 during 6 shell ring assemblings; In conjunction with Fig. 6, can adopt the form of 6+1 during 7 shell ring assemblings.

Measure the perpendicularity of plane, root face place and axis, satisfy specification requirement.

Measurement is segmented for the cross section of radius minimum with respect to the least radius of axis, determines that least radius distributes, so that the installation of follow-up internals.In conjunction with Fig. 2, the concrete measuring method of least radius is: at the hoop minor axis place of each shell ring and left and right 300mm respectively survey 1 point, major axis place and respectively survey 1 point (being that 8 points are surveyed in each cross section), axially survey 3 uniform cross sections, as the A in Fig. 2, B, cross section, 3, place of C, totally 24 points, get the point of radius minimum.During two shell rings, as shown in Figure 3, get 6 planes.By that analogy.

Measure the inwall linearity.

The closing end component of equipment and shell ring assembly can adopt concentricity and the perpendicularity of same procedure optical measurement closing end component and shell ring assembly in assembling process.

Shell ring assembly or closing end component are in assembling process, for the very high equipment of required precision, can carry out respectively concentricity and the perpendicularity of an optics repetition measurement equipment after the appropriate gag of weldering and after final heat treatment, require repetition measurement data after final heat treatment to satisfy the specification requirement of equipment.

Use the assembly method that guarantees the Whole Equipment axiality in a kind of pressure vessels for the chemical industry provided by the invention can guarantee that the axiality of Whole Equipment satisfies specification requirement; Simultaneously, should note making the data of measurement during assembling as far as possible little, after appropriate and heat treatment, the axiality of equipment may become greatly, guarantee that the repetition measurement data of Whole Equipment can satisfy specification requirement because of circular seam welding.

Claims

1. guarantee the assembly method of Whole Equipment axiality in a pressure vessels for the chemical industry, it is characterized in that: the method is comprised of following 4 steps:

Step 1: at all shell ring two ends processing UV grooves (1) to be assembled;

Step 2: processing datum (2) below the double V-groove of shell ring inwall UV groove (1);

Step 3: as measuring basis, simulate the axis of each shell ring with the datum level (2) at shell ring two ends;

2. guarantee the assembly method of Whole Equipment axiality in a kind of pressure vessels for the chemical industry as claimed in claim 1, it is characterized in that: the width (a) of datum level in described step 1 (2) is 5～10mm.

3. guarantee the assembly method of Whole Equipment axiality in a kind of pressure vessels for the chemical industry as claimed in claim 1, it is characterized in that: in described step 3, the method for axis of simulation shell ring is: circumferentially evenly get 8 points at datum level (2), along circumferentially connecting in twos apart from one another by the point of three points, simulate the center of circle of datum level (2), the center of circle that connects two datum levels (2) at shell ring two ends is the axis of shell ring.