Argon Arc Welding High Pressure Power Plant Heating Surface Boiler Membrane Wall

Membrane Water Wall Description

Membrane water wall is an air-tight structure consisting of pipes and fins.The advantages are less air leakage in furnace; can use pipe-laying wall, less load on steel structure and lower cost of boiler; easy to use suspension structure and improve thermal expansion system, suitable for large-scale mechanized production, high assembly rate, low heat storage capacity and shorten star-up and shutdown time. The disadvantage is that the manufacturing process is complex. Membrane water wall is often used in large capacity, high temperature and high pressure boilers.

According to the different manufacturing process, the membrane water wall can be divided into three types(see Fig. 1):1.rolled fin tubes are welded in rows, with less welding workload, but the fin tubes are expensive. 2.bare tube and fin(flat steel) are welded in rows, which has low material cost and can easily meet the requirements of various pitches, but flat steel requires high precision and finishing equipment.3.Bare tube fusion welding,the fins between tubes are formed by filling the welding wire, mostly used for the small pitch between the tubes. The pitch between tubes of membrane water wall is related to factors such as boiler pressure and furnace heat load, usually s/d is 1.2-1.5.

The heating surface arranged on the inner wall of the furnace is mainly cooled by water, which is called the water wall. It is the main evaporation heating surface of power station boiler. The main functions of the water wall are :

(1) absorbing the radiant heat in the furnace, heating the water into saturated steam;

(2) protect the furnace wall, simplify the structure of the furnace wall, reduce the weight of the furnace wall, which is mainly due to the absorption of radiant heat in the furnace wall water wall, so that the temperature of the furnace wall is reduced;

(3) the absorption of heat in the furnace, the flue gas cooled to the temperature allowed by the furnace exit, which is beneficial to reduce the slagging in the furnace and prevent the slagging in the furnace exit;

(4) The water wall absorbs radiant heat at high temperature in the furnace and has good heat transfer effect, so it can reduce the boiler steel consumption and boiler cost.

Advantages

1.ensure sealing of furnace wall and reduce air leakage in combustion chamber.

2.realize full water cooling of the combustion chamber, which is helpful to prevent coke formation in the case of intensified combustion.

3.small capacity of heat storage, fast heating of combustion chamber and rapid cooling, can shorten the cooling time of boiler start and stop.

4.it is appropriate to use pipe furnace wall, which greatly reduces the load of boiler frame and is convenient for suspension.

5.compared with the optical tube, the heat absorption capacity of the tube is improved.

6.the pre-combination degree of boiler components is improved, which is convenient and reduces the installation workload.

Specification of Membrane Water Wall

Note

Quality Control

1. Fabrication area of 200,000 square meters

2. 150 Engineers

3. 400 Coded welders

4. 60 Licensed Inspectors(NDT Level-III instructors)

5. Class-A Licenses for Design and Manufacture Boiler

6. ISO 9001:2008 Quality System

7. ASME Certificate of Power Boilers

8. ASME 'S','U' and NB stamp authorization

Company Introduction

Established in 1985,Zhangjiagang Hua Dong Boiler Co.,Ltd.(trading as HD Boiler),produces power plant; industrial; waste heat; waste incineration; biomass; organic heat carrier and electric steam boilers. Coupled with a comprehensive range of heating surfaces, HD Boiler brings to the market a unique service including boiler design , fabrication, installation, maintenance and replacement of boiler pressure parts.