SA192 Boiler Membrane Wall High Sealing Performance For Power Station

High Heat Absorption Efficiency Boiler Membrane Wall Tube SA192/SA36 ASME Standard

Boiler Membrane Wall Introduce

Boiler water walls are membrane walls that are made of tubes welded together with or without a strip of metal in between. These walls form the enclosure of the coal combustion chamber. Water wall tubes are also referred to as the evaporator section; they contain water mostly in liquid form which gradually evaporates as it rises in the boiler.

1.Membrane walls are widely used in boilers for utility/power stations as a heat exchange part.

2.Membrane water wall panels were combined with steel tubes and flats to ensure good sealing and significant reduce the air leakage factor of negative preasure boiler,improve combustion condition in furnace.

3.Membrane water wall panels increase radiation heat surface and save steel consumption.

Manufacture

HD Boiler use submerged-arc welding technology to produce water walls as Eco-friendly requirement.

It also can guarantee a good sturdy construction and sealing.

HDB provides replacement boiler water walls, burner openings, inspection ports and doors for utility and industrial boilers. Recently completed projects include rear and sidewall replacement as part of a complete reheater replacement and the studded burner throat with bifurcated tubes pictured to the right. Inspection ports, camera ports, and access doors of any brand are also available.

Constructure Features

1. Check and adjust the width, length, flatness and diagonal of the pipe row when the segmented pipe row is hoisted onto the combination frame.If the width of the tube row is greater than or less than the specified size, the fin can be cut to an appropriate length, adjusted to the specified size and then re-welded.When the diagonal difference of pipe row exceeds lOmm, fins between some pipes with larger size can be cut to reduce the distance between pipes to eliminate the diagonal difference, and then the fins can be welded.When the unevenness of the pipe row exceeds the allowable range, gantry frame can be used to correct the top pressure of the jack.

2. The butt joint of pipe row is different from that of a single pipe.The welding joint of a single pipe shrinks by about 1-2mm after welding, which has no effect on other pipes.But the pipe row is not the same, two sections of pipe row butt welding, if from one side to the other side of the sequence of welding, welding to the end of the pipe caused by the deformation is very large.Therefore, before the butt welding, the butt clearance of this welding joint should be comprehensively measured, and according to the butt clearance is too small, moderate, too large classification, if the butt clearance is too large or too small, must take the method of cutting the pipe, replaced with a moderate short pipe.At this time, due to the shrinkage of welding, the pipe with a larger gap will become solderable. In order to reduce the shrinkage deformation of pipe welding, the method of symmetry and cross welding should be adopted.

3. The lower part of the front and rear water cooling wall has furnace bottom (cold ash bucket), and the upper part of the rear water cooling wall has flame Angle, so the size of the component is larger and the shape is more special, so it is difficult to combine.

4. The single pass ball of the rear water wall pipe is different from other heating surface pipes.Because the rear water wall in the upper header box has a flameproof Angle, the number of flameproof Angle bending pipe is the same as that of the rear water wall, in order to increase the rigidity of the flameproof Angle, there is also a considerable number of spacing straight pipe (most furnace type).At the intersection of flame Angle and straight pipe, equidiameter special-shaped cast steel tee (three-branch pipe) is installed.In the straight tube and the junction between the top allied tank is equipped with orifice Φ 5 mm or Φ restrictor of 10 mm.In this way, most of the working medium bent pipe is conducive to the cooling of the flame Angle, and a small part of the working medium bent pipe ensures that the straight pipe and the curved pipe have the corresponding amount of expansion, so as to reduce the internal stress, so the difficulty of passing through the ball increases.

Advantages

Workshop