How to determine the requirements for the material of boiler accessories

The function difference of cast steel, malleable steel and gray iron in boiler parts:

1. Brightness: The cast steel boiler parts are shiny, the cast iron is dark and gray, the gray iron in the cast iron is different from the nodular cast iron, and the ductile iron is brighter than the gray iron.

2. Particles: The cast steel boiler fittings are very fine and dense, and particles are generally invisible to the naked eye. Both gray iron and ductile iron can see particles, and gray iron particles are larger.

3. Movement and static: The collision of steel castings is "just now", which is different from the movement of cast iron boiler fittings.

4. Gas cutting: The surface of the boiler fittings casting steel is rough. The area of ​​the riser and gate is large, so it is necessary to eradicate it by gas cutting. Nodular cast iron gas cutting is continuous.

5. Resistance: The cast steel resistance boiler fittings factory is close to the steel plate, and the ductile iron boiler fittings are less resistant. The thin-walled parts can be bent at 20-30 degrees, and the gray mouth is not resistant.

According to different situations, different methods can be used for boiler accessories. If the equipment does not leak, but the heat transfer system K has dropped, you can use a closed circuit system to inject the descaling liquid into the equipment without disassembling the heat exchanger. The internal circulation is enough for a few hours. There is no such condition on site, and when the equipment is disassembled or the scale is found to be less serious, you can directly flush with water without removing the plates, and just use a soft brush to flush.

In thermal power plants, the function of the boiler is to generate high-temperature and high-pressure steam using the heat energy released by the combustion of fuel. The planning and main components of the boiler body are all set up to fulfill its functions. The boiler body is planned with a furnace, a horizontal flue and a vertical flue (tail flue). The main components are set up according to the combustion system and the soda system, including air preheater, burner, economizer, steam drum, downcomer, Water wall, superheater, reheater, etc.