Converter vaporization cooling flue process flow

Release time:

Oct 24,2018

1. Manufacture of each water distribution tank in the flue: The tanks in each section of the flue are all simmered by an intermediate frequency simmering tube machine.Before the container tube is cut, magnetic particle flaw detection is performed on each container tube to ensure that the container tube is free of cracks, pores and other defects.After the intermediate frequency elbow is formed, the magnetic particle flaw detection is performed again to determine that there are no processing defects.The special tire gear on all simmered collection boxes is corrected twice, and the geometry is strictly guaranteed to meet the requirements of the drawings.After the pipe end is machined and beveled, the upper butt tire is butt welded, the butt gap is controlled at 2mm, argon arc welding is used as the base, and the 507 welding cover is used to ensure that there is no deformation of the container after welding.The welded junction of the container can enter the next process after passing the radiological flaw detection.

2. Due to the difficulty of opening the annular container, three rows of machined holes with different angles need to be processed in the surrounding direction.We make special tire tools according to the different diameters and angles of the annular container to ensure that each hole processed by the drilling machine is a radial hole, and each hole is reamed with a reamer to ensure the deviation and accuracy of the pipe hole.Strictly remove the inside of the collection box without leaving any debris.

3. When assembling the flue body, a large number of assembled tires are first made according to the design and process drawings, including the container positioning chassis, the fixing ring bracket, the connecting flange fixing bracket, and the heating surface tube positioning chuck.Strictly control the geometry of the assembled tire, and the accuracy of the tire is used to ensure the accuracy of the body assembly.The tire material invested here accounts for about one-quarter of the total weight of the body, and it is for one-time use.Although the investment is large and the labor is large, we think it is worth it to ensure the overall manufacturing quality.

4. When welding the pipe group on the heated surface of the body, the welding process parameters should be used rationally, the welding should be applied accurately, and the inspection should be strictly carried out.The welding of the heated surface pipe and the container adopts 507 welding. All pipe joints are machined and polished smoothly before welding, and polished after welding to detect defects.Argon arc welding is used for the butt of the heated surface pipe, and an electric beveling machine is used at the end of the pipe to open the beveling on site to ensure the welding butt gap.After positioning with a positioning card, welding is applied, and ultrasonic flaw detection is used after welding.The heating surface pipe is simmered according to the drawings, and the tire fittings are made and inspected after the samples are released to control the quality of the elbow.After the pipe is simmered and welded, a through-ball test is carried out to check the ovality of the pipe.After the pipe is qualified for flaw detection, the assembly and welding of the pipe and fins are carried out.Evaluate the welding process before welding, conduct cross-section inspection of the welding specimen, check the fusion and penetration of the weld, and adjust the welding parameters.The fin welding adopts carbon dioxide gas shielded welding, and the total length of the welds of each set of flue is tens of thousands of meters. The workload is large, the welding location is complex, and the difficulty is high.During construction, we overcome many unfavorable factors, strictly control the process parameters, ensure the height of the welding feet, use anti-splashing fluid, reduce splashes around the weld, and polish and inspect all welds after welding. Resolutely eliminate defects such as weld bite edges.

5. After all welding work is over, conduct a hydrostatic test.After the pressure test is qualified, heat treatment is carried out to eliminate the welding stress.According to the shape of the flue and the actual conditions of the heat treatment temperature requirements, we have specially designed a special heat treatment furnace for the flue.The volume of the furnace can be adjusted, from small pieces such as the cutting port inserter to large pieces such as the flue of the furnace mouth section, which overcomes the disadvantages of the general annealing furnace that the cost of processing small pieces is too large and the processing of large parts cannot be accommodated by the water distribution pipe.The heating of the workpiece and the temperature in the furnace are controlled by a computer to ensure the balance of the temperature gradient in the furnace, and the furnace temperature increase speed is stable.