Membrane wall, also known as membrane water-cooled wall, uses tubes and flat steel welded to form a tube screen, and then multiple groups of tube screens are combined together to form a membrane wall structure.
What are the advantages of membrane wall structure?
The membrane water-cooled wall ensures good tightness of the furnace. For negative pressure boilers, it can significantly reduce the air leakage coefficient of the furnace, improve the combustion conditions in the furnace, and increase the effective radiation heating area, thus saving steel consumption. Membrane walls are mostly used in membrane wall steam generators. They have the advantages of simple structure, saving steel, better insulation and air tightness.
The membrane wall tube screen melting extremely active gas shielded automatic welding production line is the world’s most advanced membrane wall tube screen manufacturing technology and equipment, from tube loading, flat steel uncoiling, finishing, leveling, to welding, etc. Realize automatic control. The upper and lower welding guns can be welded at the same time, the welding deformation is small, and there is almost no need for correction after welding, so that the geometric dimensions of the tube panel are accurate, the fillet weld quality is excellent, the shape is beautiful, the welding speed is fast, and the production efficiency is high.
Nobeth steam generator has an advanced membrane wall production line, and the furnace adopts membrane water-cooled wall sealing technology. In the process of membrane wall processing, double-sided simultaneous welding is used, so that the workpiece is heated more evenly and the tube panel is less deformed; it also eliminates the need to turn over for welding, reducing the workload of deformation correction after welding of the product, and greatly improving production efficiency. Therefore, most membrane wall steam generators are shipped fully assembled from the factory, making transportation and installation very easy, and the amount of on-site installation required by the user is greatly reduced.
(1) The membrane water-cooled wall has the most complete protection effect on the furnace wall. Therefore, the furnace wall only needs insulation materials instead of refractory materials, which greatly reduces the thickness and weight of the furnace wall, simplifies the furnace wall structure, and reduces the cost of the furnace wall. Total boiler weight.
(2) The membrane water-cooled wall also has good air tightness, can adapt to the requirements of positive pressure combustion on the boiler, is not prone to slagging, has less air leakage, reduces exhaust heat loss, and improves the thermal efficiency of the boiler.
(3) The components can be welded by the manufacturer before leaving the factory, and the installation is quick and convenient.
(4) Boilers using membrane wall structures are easy and simple to maintain, and the service life of the boiler can be greatly improved.
Welding of pipe panel fillet welds
Tube screen welding method of membrane wall light pipe and flat steel structure. The welding process used in membrane wall light pipe and flat steel structure mainly includes the following:
1. Automatic melting extremely active gas shielded welding
The mixed composition of the protective gas is (Ar) 85% ~ 90% + (CO2) 15% ~ 10%. In the equipment, the pipe and flat steel are pressed by upper and lower rollers and transported forward. Multiple welding guns can be used to move up and down. Welding is performed simultaneously.
2. Fine wire submerged arc welding
This equipment is a fixed frame welding workstation. The machine tool has the functions of steel pipe and flat steel positioning, clamping, feeding, welding and automatic flux recovery. It is generally equipped with 4 or 8 welding guns to complete 4 or 8 horizontal positions at the same time. Welding of fillet welds. This technology is simple to operate and does not have high requirements on the surface of the pipe and flat steel. However, it can only be welded on one side in a horizontal position and cannot achieve simultaneous welding of the top and bottom.
3. Semi-automatic gas metal arc welding
When welding by this method, the tube panel should be tack-welded and fixed first, and then welded by manually operating the welding gun. This welding method cannot weld the upper and lower parts at the same time, and it is difficult to achieve continuous and uniform welding of multiple welding guns, so it is difficult to control the welding deformation. When semi-automatic gas metal arc welding is used for pipe panel welding, attention must be paid to the reasonable selection of the welding sequence to minimize welding deformation. The fillet welds for sealing flat steel at local openings on the tube panels, as well as the fillet welds for special-shaped tube panels such as cold ash hoppers and burner nozzles, are often welded by semi-automatic gas metal arc welding.
The membrane wall tube screen melting extremely active gas shielded automatic welding production line is the world’s most advanced membrane wall tube screen manufacturing technology and equipment, from tube loading, flat steel uncoiling, finishing, leveling, to welding, etc. Realize automatic control. The upper and lower welding guns can be welded at the same time, the welding deformation is small, and there is almost no need for correction after welding, so that the geometric dimensions of the tube panel are accurate, the fillet weld quality is excellent, the shape is beautiful, the welding speed is fast, and the production efficiency is high.
Post time: Oct-30-2023
