Boiler Membrane Wall For Improved Combustion Chamber Efficiency With ASME Standard

Boiler Membrane Wall for Improved Combustion Chamber Efficiency with ASME standard

Product Introduce: Boiler Membrane Wall 

       The membrane water wall is an airtight structure made of pipes and fins welded. The advantages are less air leakage in the furnace, and the pipe laying furnace wall can be used to reduce the load of the steel structure and reduce the boiler cost; Facilitate the use of suspension structures and improve the thermal expansion system; It is suitable for large-scale mechanized production and has a high assembly rate; The heat storage capacity is small, and the start-up and shutdown time is shortened. The disadvantage is that the manufacturing process is complex. Large-capacity, high-temperature and high-pressure boilers mostly use membrane water walls.

Classification

According to the different manufacturing processes, there are three types of membrane water cooling walls:

(1) The first one is welded in rows with rolled fin tubes, and the welding workload is small, but the fin tubes are expensive.

(2) The plain tube and fin (flat steel) are welded in rows, the material cost is low, and it is easy to meet the requirements of a variety of pitches, but the flat steel has high precision requirements and requires finishing equipment.

(3) Plain tube sintering welding, the inter-pipe fin is formed by the welding wire melting and filling, which is mostly used for the pipe screen with a small inter-pipe pitch. The inter-tube pitch of the membrane water wall is related to the boiler pressure, furnace heat load and other factors, and the general s/d is 1.2~1.5.

Advantages

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.