High - Strength Membrane Water Wall Tube Industrail Boiler Spare Parts

 
High - Strength Membrane Water Wall Tube Industrail Boiler Spare Parts
 
Description

Membrane walls were originally used in land power plants and are increasingly used in Marine boilers.Initially, experience acquired in making the lower part of the furnace compact enough to contain liquid ash was demonstrated by welding steel between floor pipes.

In both of these methods, longitudinal welding is done by automated processes, and panels of required size are set up ready to be welded directly to the manifold or, in some cases, to the stubs on the barrel.

 
Manufacture

Manufacturing process: water wall tube blasting or polishing and cutting tube to slitting, cutting straight the extension - cut 100% RT - cutting and grinding weld cutting fabrication and flat steel pipe fillet weld to cut 100% of the visual inspection, line cutting and cutting rows bend to cut holes, cutting and bent pipe fabrication pore cutting 100% RT to fabrication seal plate cutting, cutting the correct line - cutting edge grinding fin and allowance - cutting and chamfering cutting water pressure to cut through the ball, coating, packing.

Material preparation for pipe and flat steel

As the main manufacturing technology of membrane wall pipe screen is the welding technology of light pipe and flat steel, the surface quality of pipe and flat steel is very important. Before entering the welding machine, the pipe must be cleaned by straight pipe polishing (polishing) machine to ensure the welding quality.

Tube is composed of many pipes and flat bars, from steel mills to buy pipes and flat bars are manufacturing tolerance, in order to eliminate the manufacturing tolerance, that after the combination of the cumulative tolerance not super bad, final appearance size, precise control of tube must be to finish of the width of the flat steel, flat steel surface at the same time, meet the requirements of welding.Flat steel processing generally adopts high strength flat steel finishing and cleaning machine, which is equipped with special finishing wheel and straightening wheel to make the width and size of flat steel precise, flat steel flat straight without distortion and convenient for welding.

The weld of the pipe screen fillet

The welding process of diaphragm wall light pipe and flat steel structure is mainly as follows:

1. Automatic fusion active gas protection welding

The mixture group of its protective gas is divided into (Ar)85% ~ 90%+(CO2)15% ~ 10%. In the equipment, pipes and flat steel are compressed by upper and lower rollers and transported forward, which can be welded simultaneously under multiple welding guns.

2. Wire submerged arc welding

This equipment belongs to the fixed frame welding workstation. The machine tool has the functions of positioning, clamping, feeding, welding and automatic recovery of welding agent for steel pipe and flat steel.This technology is simple to operate and requires less on the pipe and flat steel surface, but can only be welded on one side of the horizontal position, which cannot be welded on the upper and lower sides at the same time.

3. Semi-automatic fusion electrode gas protection welding

When welding with this method, the pipe screen should be fixed by positioning welding, and then manual welding by welding torch.This welding method can neither weld on the bottom at the same time, nor achieve continuous and even welding of multiple welding guns, so it is difficult to control welding deformation.When using semi-automatic fusion electrode gas protection welding for pipe screen welding, we must pay attention to selecting welding sequence and minimize welding distortion.The fillet welds of the flat steel at the partial opening of the tube plate and the fillet welds of the special tube plate such as the cold ash bucket and burner nozzle are usually welded by semi-automatic fusing gas shielded welding.

The automatic welding production line for melting polar active gas protection of membrane wall pipe plate is the most advanced manufacturing technology and equipment in the world at present. Automatic control can be realized from pipe feeding, flat steel uncoiling, finishing, leveling and welding.The upper and lower welding gun can be welded at the same time, the welding deformation is small, there is almost no need to correct after welding, so that the geometric size of pipe screen is accurate, the quality of fillet weld is good, the appearance is beautiful, the welding speed is fast, and the production efficiency is high.
 
Features

1. Sturdy construction
2. High strength
3. Accurate dimensions
4. Corrosion resistant finish
 
 Advantages

1. To guarantee the leakproofness of furnace wall and reduce the air leak of combustion chamber.
2. To achieve the full water cooling of combustion chamber, and the boiler accessories membrane water wall is benefit to prevent coking under the condition of supplemental firing.
3. The thermal storage capacity is small, the warming of combustion chamber is fast and the cooling is also fast, which could shorten the cooling time of boiler’s start and furnace shut down.
4. It is good to adopt top supported water cooled wall and it could reduce the load of boiler framework, which is benefit to overhang.
5. Compared with the bare tubes, the membrane water wall improves the heat absorption capacity of tubes.
6. The factory direct boiler membrane water wall could improve the Preliminary combination degree of boiler parts and reduce the installation workload.
 
 
Quality Control

1. Fabrication area of 200,000 square meters
2. 80 Engineers
3. 200 Coded welders
4. 30 Licensed Inspectors(NDT Level-III instructors)
5. Class-A Licenses for Design and Manufacture Boiler
6. ISO 9001:2015 Quality System
7. ASME Certificate of Power Boilers
8. ASME 'S','U' and NB stamp authorization