zozen boiler
Home Service FAQs FAQ of circulating fluidized bed boilers Why is the water wall tube damaged when the circulating fluidized bed boiler operates?

Why is the water wall tube damaged when the circulating fluidized bed boiler operates?

12 Jul 2018

(Question Details) Specific Performance:

(1) There are blasting sounds in the furnace, and the furnace chamber is under positive pressure. There is smoke emitted from the combustion chamber in a leakage. In severe cases, the explosion-proof door of the boiler body opens.

(2) Drum water level drops rapidly and the feedwater flow rate is not abnormally larger than steam flow. MFT acts when the water level is below -280mm.

(3) Drum pressure, steam flow rate, exhaust temperature decrease, smoke temperature difference increases on both sides.

(4) The negative pressure at the inlet of the flue and suction fan becomes smaller and the temperature difference between the two sides increased.

(5) Smoke temperature decreases at the inlet and outlet of the cyclone separator, and the temperature of the material returned is low.

(6) Bed pressure increases, bed materials clean, fluidization poof, bed temperature distributes unevenly and bottom slag discharge difficultly.

 

Answer:cause of failure:

(1) Fly ash wear thins the pipe wall.

(2) Defective membrane water wall.

 

Troubleshooting:

(1) If the water wall tube is not badly damaged and can maintain the normal position and the failure will not be expanded, the load can be appropriately reduced and the maintenance time can be shortened to run until the standby furnace is put into operation. If the standby furnace can’t be put into operation for a long time and the damage of the malfunctioning furnace is intensified, the furnace should be stopped immediately.

(2) If the normal water level cannot be maintained, stop the furnace immediately, stop the bottom material and circulating ash, keep the induced draft fan running, and stop the induced draft fan after the steam leakage is eliminated.

We are strictly in accordance with the provisions of the use of advanced automatic robot and welding machine to complete the manufacture of elbows and the welding between the elbow and flat steel, fully automated to ensure the accuracy of the distance between the two.


Related FAQs View More
Related news View More
  • ZOZEN Boiler in Shandong: Innovative Boiler Models Empower Diverse Production
    On the thriving industrial land of Shandong, the continuous demand for thermal energy supply from enterprises drives the transformation of the boiler industry. With profound technical expertise and ongoing innovation, ZOZEN Boiler remains at the forefront of providing high-quality, adaptable boiler models for various industries.   ZOZEN Boiler Provides Tailored Boiler Solutions for Shandong Industries   Looking back, the cooperation projects with Shandong Luhua Group and Shandong...
    29 Jul 2025
  • ZOZEN Gas Water Tube Boilers Make a Strong Entrance on Cable Industry
    In the industrial zone of Wen’an County, Xinghua Cable Co., Ltd. is making steady progress on its project with an annual production capacity of 11 million meters of wires, cables, and accessories, backed by an investment of RMB 520 million. Upon completion, the project is expected to create over 150 jobs and generate annual sales revenue of RMB 800 million, demonstrating promising prospects. As a key supplier of thermal energy equipment, ZOZEN Boiler is quietly supporting the development o...
    22 Jul 2025
  • ZOZEN Boiler Facilitates Power Plant “Oil-to-Gas” Upgrade
    On March 20, 2025, the Guizhou Jinyuan Zhijin “Replacing Small Units with Large Ones” Relocation Project (2×660 MW), under State Power Investment Corporation, successfully achieved the first ignition of its boiler. This project replaced traditional oil-fired ignition fuel with liquefied natural gas (LNG), setting a new precedent for employing clean energy in 660 MW ultra-supercritical “W” flame boilers. As a key equipment supplier for this project, ZOZEN Boiler prov...
    15 Jul 2025

Find the Right Boiler For You

Name *

Email *

WhatsApp/WeChat

Products

Power/Capacity