Boiler Membrane Wall For High-Temperature Flame Absorption And Protection

Boiler Membrane Wall for High-Temperature Flame Absorption and Protection

Product Introduce: Boiler Membrane Wall 

         The water wall is the main heating part of the boiler, which consists of several rows of steel tubes, which are distributed around the furnace chamber of the boiler. Its interior is flowing water or steam, and the outside receives heat from the flame in the furnace chamber of the boiler. It mainly absorbs the radiant heat of the high-temperature combustion products in the furnace, in which the working fluid moves upwards and evaporates by heat.

        The water wall was originally designed not to be heated, but to cool the furnace from high temperatures. Later, due to its good heat exchange function, it gradually replaced the steam drum as the main heating part of the boiler. The evaporation heating surface is laid on the inner wall of the boiler furnace and consists of many parallel tubes. The function of the water wall is to absorb the radiant heat of the high-temperature flame or flue gas in the furnace, generate steam or hot water in the tube, and reduce the temperature of the furnace wall to protect the furnace wall. In a large-capacity boiler, the flame temperature inside the furnace is very high, and the intensity of thermal radiation is great. 40~50% or even more of the heat in the boiler is absorbed by the water wall. Except for a few small-capacity boilers, modern water-tube boilers use the water wall as the main evaporation heating surface in the boiler.

Advantages

        According to the structural type, there are three main types: plain tube type, membrane type and squeaked tube type. The plain tube water wall is composed of a whole row of seamless steel pipes, and their structure is the simplest;The membrane water wall weld many rolled water-cooled fin tubes together with spot welding, so that they become a sealed combined heating surface, which can not only improve the air tightness of the furnace, reduce air leakage, but also better protect the furnace wall, reduce the weight of the furnace wall, simplify the structure;The water wall of the spur tube is to weld many pins with a length of 20~25mm and a diameter of 6~12mm on the water-cooled wall tube, and then apply chrome ore refractory plastic in order to reduce the heat absorption of this part of the water wall and increase the temperature of the combustion zone, it is suitable for occasions where fuel ignition is particularly difficult or some liquid slag discharge furnaces.

        According to the layout part, there are two kinds of attached wall type and partition wall type (i.e., double-sided heating) water cooling wall. The former is mostly partially embedded in the inner wall of the furnace wall and absorbs heat on one side, while the latter is mostly installed in the middle of the furnace chamber of a large boiler, separating the whole furnace into two independent parts that are heated on both sides.

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.

Features

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

Description

        Water wall panels are used in Waste Heat recovery boilers. We manufacture Water wall panels. These are fabricated out of carbon steel tubes to customers' drawings and specifications. Special care is taken for ovality and thinning at the bent portion, during fabrication.

We are manufacturing and supplying a comprehensive range of Waterwall Panels. The tubes offered by us are known to withstand a great internal pressure as a continual strip of fin material is wound spirally on the tube. These tubes are known to provide heat uniformly that result in an increased heat output.

        The main function of water wall panels in boiler is to absorb the heat generated by high temperature flame or flue and to generate steam or hot water in tubes, hence to reduce the temperature in the chamber.

Construction Details

The combination characteristics of membrane water cooling wall are as follows:
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.

About us

        Hua Dong Boiler Co., Ltd. is a high-tech enterprise specialized in manufacturing boilers. Established in early 1985s, has two manufacturing bases, this company covers 400,000 ㎡ with fixed assets amounting to USD 110,000,000. There are 1100 employees including 150 technicians and 600 coded welders. Hua Dong holds the manufacturing licenses for Grade A boilers and Grade A1&A2 pressure vessels issued by Chinese General Administration of Quality Supervision, Inspection and Quarantine; also it holds the "S" and "U" "NB" stamps issued by American Society of Mechanical Engineers; meanwhile, this Company has passed the certification of ISO9001, SO3834, EN12952 Quality Management System.