Horizontal fire tube type waste heat boiler manufacturing optimization process

Abstract

The invention relates to the technical field of boiler manufacturing processes, and provides a horizontal fire tube type waste heat boiler manufacturing optimization process which comprises the following steps that S1, a right side tube box is manufactured, and the barrel diameter of the right side tube box is rolled according to the standard that the shell pass barrel diameter is plus 2 mm; s2, temporarily not assembling and welding a valve port connecting pipe when an accessory is assembled and welded on a cylinder body of the right side pipe box; s3, a sleeving hole is formed in a rear annular plate of the left side tube box, and the diameter of the sleeving hole is formed according to the standard that the diameter of a shell pass barrel is plus 4 mm; s4, actually measuring the outer diameter size deviation of a heat exchange tube, and determining the deviation of a tube hole formed in a tube plate; s5, actually measuring the diameter of the central tube, wherein the diameter of a central hole of the tube plate is set according to the standard that the diameter of the central tube is plus 2mm; 6, the right side tube box and the left side tube box are sequentially arranged on the shell pass barrel in a sleeving mode; and S7, the valve port connecting pipe and a branch pipe of the heat-resisting three-way pipe are assembled in a circular seam mode.

Description

Technical Field

[0001] The invention relates to the technical field of boiler manufacturing technology, and in particular to a horizontal fire tube type waste heat boiler manufacturing optimization process. Background Art

[0002] The fire tube type waste heat boiler sends the medium-pressure steam generated by the process gas after the cracking of waste acid during the cooling process into the steam drum, and after separation, it is used by other devices, with a steam production capacity of about 3.6t / h. The fire tube type waste heat boiler adopts a horizontal structure, consisting of a right-side pipe box, a left-side pipe box and a shell-side cylinder. The material of the right-side pipe box is Q345R (normalized), with a diameter of Φ1832; the material of the left-side pipe box is 15CrMoR (normalized + tempered), with a diameter of Φ2560; the material of the shell-side cylinder is Q345R (normalized), with a diameter of Φ1750.

[0003] The manufacturing process of the fire tube waste heat boiler has the characteristics of multiple weld heat treatments and a large number of flaw detections. Therefore, the assembly sequence is very important. If the assembly sequence is unreasonable, the number of local heat treatments will increase, or the welds cannot be operated due to limited space and have to be re-welded. Summary of the invention

[0004] In view of the defects in the prior art, the purpose of the present invention is to provide an optimized manufacturing process for a horizontal fire tube type waste heat boiler, formulate detailed processing and inspection process flow, so that various components can be better coordinated during manufacturing and assembly to ensure quality requirements.

[0005] The present invention provides a horizontal fire tube type waste heat boiler manufacturing optimization process, comprising the following steps:

[0006] Right side pipe box manufacturing:

[0007] S1. The cylinder diameter of the right side pipe box is rolled according to the standard of shell side cylinder diameter + 2mm;

[0008] S2, when welding accessories on the cylinder of the right pipe box, do not weld the valve port pipe temporarily;

[0009] Left side pipe box manufacturing:

[0010] S3, opening a set hole on the rear ring plate of the left pipe box, wherein the diameter of the set hole is set according to the standard of the diameter of the shell side cylinder + 4mm;

[0011] The shell side cylinder manufacturing:

[0012] S4. Measure the outer diameter deviation of the heat exchange tube to determine the deviation of the tube hole opened on the tube sheet;

[0013] S5. Measure the diameter of the center tube. The diameter of the center hole of the tube sheet is set according to the standard of the center tube diameter + 2mm;

[0014] Overall assembly:

[0015] S6, the right pipe box and the left pipe box are sequentially mounted on the shell-side cylinder;

[0016] S7. The valve port connecting pipe is assembled with the branch pipe annular seam of the heat-resistant tee pipe.

[0017] Furthermore, after the cylinder of the left pipe box is rolled, it is loaded into the anti-deformation support tooling, and then the hole opening operation and the welding accessories are carried out in sequence.

[0018] Furthermore, a back pad is added when welding the Φ2100 pipe and the Φ1900 ​​pipe on the cylinder of the left box body.

[0019] Furthermore, the flange of the Φ2100 connecting pipe is reserved with a secondary processing margin, and the sealing surface is re-machined after the fillet weld is installed with the body of the Φ2100 connecting pipe.

[0020] Furthermore, the heat exchange tubes are horizontally welded to the tube sheets, and mechanical tube expansion is used to meet structural design requirements.

[0021] Furthermore, the annular seam and fillet weld of the tube sheet are thermally treated simultaneously by pressing the furnace door.

[0022] Furthermore, in step S7, the heat-resistant three-way pipe is rear-mounted with an end plate.

[0023] Furthermore, the ceramic fiber felt of the left pipe box is made of high temperature resistant material in slices, and adjacent ceramic fiber felts are connected in a locking manner.

[0024] Furthermore, the inner wall of the right pipe box in the area 200 mm away from the end thereof is rounded.

[0025] Beneficial effects: The invention provides an optimized manufacturing process for a horizontal fire tube waste heat boiler. By analyzing and judging the difficult problems in the manufacturing process, a reasonable welding sequence is formulated, assembly tooling is prepared, and dimensional margins are pre-placed, so that the various parts of the product can be quickly and efficiently manufactured and the product quality can be guaranteed during the actual production processes such as hot and cold processing, forming, assembly, welding, and testing. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the process of the present invention. DETAILED DESCRIPTION

[0027] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0028] like Figure 1As shown, the present invention provides a horizontal fire tube type waste heat boiler manufacturing optimization process, comprising the following steps:

[0029] Right side pipe box manufacturing:

[0030] S1. The cylinder diameter of the right side pipe box is rolled according to the standard of shell side cylinder diameter + 2mm, which is convenient for subsequent assembly with the shell side cylinder.

[0031] S2. When welding accessories on the cylinder of the right pipe box, do not weld the valve port pipe yet.

[0032] The other production processes of the right pipe box are carried out according to conventional steps, and the specific conventional steps will not be repeated.

[0033] Left side pipe box manufacturing:

[0034] S3. A fitting hole is opened on the rear ring plate of the left pipe box. The diameter of the fitting hole is set according to the diameter of the shell-side cylinder + 4mm to facilitate subsequent fitting with the shell-side cylinder.

[0035] The rest of the production process of the left pipe box is carried out according to conventional steps, and the specific conventional steps will not be repeated.

[0036] Shell and cylinder manufacturing:

[0037] S4. Measure the outer diameter deviation of the heat exchange tube and determine the deviation of the tube hole opened on the tube sheet.

[0038] S5. Measure the center tube diameter. The center hole diameter of the tube plate is opened according to the standard of center tube diameter + 2mm.

[0039] The other production processes of the shell-side cylinder are carried out according to conventional steps, and the specific conventional steps will not be repeated.

[0040] Overall assembly:

[0041] S6, the right side pipe box and the left side pipe box are sequentially mounted on the shell side cylinder.

[0042] S7. The valve port connecting pipe and the branch pipe annular seam of the heat-resistant tee pipe are assembled.

[0043] The other production processes of the overall assembly are carried out according to conventional steps, and the specific conventional steps will not be repeated.

[0044] In one embodiment, after the cylinder of the left pipe box is rolled, the anti-deformation support tool is installed, and then the hole opening operation and the accessories are welded in sequence. In this way, the deformation of the cylinder of the left pipe box after rolling is completed and during the welding process can be better guaranteed.

[0045] In one embodiment, a back pad is added when large pipes such as a Φ2100 pipe and a Φ1900 ​​pipe are welded to the cylinder of the left box body.

[0046] In one embodiment, the flange of the Φ2100 pipe is reserved for secondary processing, and the sealing surface is re-machined after the fillet weld is installed with the body of the Φ2100 pipe. This is more conducive to eliminating welding and thermal deformation and is convenient for assembly.

[0047] In one embodiment, the heat exchange tube and the tube sheet are horizontally welded, and mechanical expansion is used to meet the structural design requirements. In this way, the short-distance expansion of the tube sheet can be achieved, and the tube sheet expansion L is ≤ 10mm, and the weld quality is better guaranteed.

[0048] In one embodiment, the annular weld and fillet weld of the tube sheet are heat-treated simultaneously by pressing the furnace door.

[0049] In one embodiment, in step S7, an end plate is installed at the rear of the heat-resistant tee pipe to facilitate RT flaw detection requirements of each annular seam of the heat-resistant tee pipe.

[0050] In one embodiment, the ceramic fiber felt of the left pipe box is made of high temperature resistant material in slices, and adjacent ceramic fiber felts are connected in a locking manner.

[0051] In one embodiment, the inner wall of the right pipe box within the area 200mm away from the end thereof is rounded. Because the cylinder body has ovality during rolling, and the pipe welded on the cylinder body will also affect the end of the set due to deformation after welding, the inner wall of the cylinder body is rounded on the vertical lathe to facilitate the set.

[0052] The beneficial effects achieved by the present invention are:

[0053] 1. The valve port pipe in the right pipe box is assembled during the overall assembly. This post-assembly makes it easier to connect the valve port pipe with the annular seam of the heat-resistant tee pipe inside the shell cylinder.

[0054] 2. The cylinder diameter of the right pipe box, the diameter of the set hole of the rear ring plate of the left pipe box, and the flange of the Φ2100 connecting pipe reserve secondary processing allowance, which is more conducive to eliminating welding and thermal deformation and facilitates assembly.

[0055] 3. The anti-deformation support tooling can better prevent the deformation of the cylinder of the left pipe box after rolling and during the welding process.

[0056] 4. Use mechanical expansion tube to meet the structural design requirements. This can achieve short-distance expansion of the tube sheet. The tube sheet expansion L is ≤ 10mm, and the weld quality is better guaranteed.

[0057] 5. The heat-resistant tee pipe is rear-mounted with an end plate to facilitate RT flaw detection requirements for each annular seam of the heat-resistant tee pipe.

[0058] 6. The use of high temperature resistant ceramic fiber felt with matching performance is more conducive to assembly, avoiding the original ceramic fiber felt being easily damaged and unevenly filled during assembly.

[0059] 7. Heat treat some welds simultaneously to achieve better energy saving and efficiency improvement.

[0060] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It is obvious to those skilled in the art that the present invention is not limited to the details of the above exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic features of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present invention.

[0061] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A horizontal fire tube type waste heat boiler manufacturing optimization process, characterized in that: The following steps are involved: Right side pipe box manufacturing: S1. The cylinder diameter of the right side pipe box is rolled according to the standard of shell side cylinder diameter + 2mm; S2, when welding accessories on the cylinder of the right pipe box, do not weld the valve port pipe temporarily; Left side pipe box manufacturing: S3, opening a set hole on the rear ring plate of the left pipe box, wherein the diameter of the set hole is set according to the standard of the diameter of the shell side cylinder + 4mm; The shell side cylinder manufacturing: S4. Measure the outer diameter deviation of the heat exchange tube to determine the deviation of the tube hole opened on the tube sheet; S5. Measure the diameter of the center tube. The diameter of the center hole of the tube sheet is set according to the standard of the center tube diameter + 2mm; Overall assembly: S6, the right pipe box and the left pipe box are sequentially mounted on the shell-side cylinder; S7. The valve port connecting pipe is assembled with the branch pipe annular seam of the heat-resistant tee pipe.

2. The manufacturing optimization process of a horizontal fire tube waste heat boiler according to claim 1 is characterized in that: After the cylinder of the left pipe box is rolled, it is loaded into the anti-deformation support tooling, and then the hole opening operation and the welding accessories are carried out in sequence.

3. The manufacturing optimization process of a horizontal fire tube waste heat boiler according to claim 2 is characterized in that: When welding the Φ2100 pipe and the Φ1900 ​​pipe on the cylinder of the left side box body, a back pad is added.

4. The manufacturing optimization process of a horizontal fire tube waste heat boiler according to claim 3 is characterized in that: The flange of the Φ2100 connecting pipe is reserved with a secondary processing allowance, and the sealing surface is re-machined after the fillet weld is installed with the body of the Φ2100 connecting pipe.

5. The manufacturing optimization process of a horizontal fire tube waste heat boiler according to claim 1 is characterized in that: The heat exchange tubes are horizontally welded to the tube sheets, and mechanical tube expansion is used to meet structural design requirements.

6. The manufacturing optimization process of a horizontal fire tube type waste heat boiler according to claim 5 is characterized in that: The annular seam and fillet weld of the tube sheet are heat-treated simultaneously by pressing the furnace door.

7. The manufacturing optimization process of a horizontal fire tube waste heat boiler according to claim 1 is characterized in that: In step S7, the heat-resistant three-way pipe is then equipped with an end plate.

8. The manufacturing optimization process of a horizontal fire tube waste heat boiler according to claim 1 is characterized in that: The ceramic fiber felt of the left pipe box is made of high temperature resistant material in slices, and adjacent ceramic fiber felts are connected in a locking manner.

9. The manufacturing optimization process of a horizontal fire tube waste heat boiler according to claim 1, characterized in that: The inner wall of the right pipe box within a region 200 mm from the end thereof is rounded.

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