What is the working principle of natural water circulation in circulating fluidized bed boilers? Why do water-cooled wall anti-wear treatment

　　We have said many times in previous articles what circulating fluidized bed boilers do, what are the advantages, and what industries they are mainly used in! Today we are talking about, circulating fluidized bed boiler is a kind of boiler, the main advantages of high efficiency, environmental protection, clean, energy saving, currently in China is mainly used in thermal power industry more widely, and gradually in the thermal power industry to replace the traditional pulverized coal furnace status. Today we continue to talk to you about circulating fluidized bed boiler natural water circulation working principle is what? And circulating fluidized bed boiler why do water-cooled wall anti-wear treatment it!

　　Circulating fluidized bed boiler water circulation system consists of steam ladle, descending tube, lower joint box and ascending tube (i.e. water-cooled wall tube set), upper joint box to form a circulation loop. As the rising tube in the furnace internal heat absorption, part of the water into steam, steam mixture density is small, while the falling tube outside the furnace is not heated, the tube is water, high density of the mass, the difference in density between the two form a driving force, so that the mixture of steam and water along the rising tube upward flow through the upper box into the steam ladle, the water in the steam ladle through the falling tube into the lower box into the water-cooled wall, thus forming the natural circulation of water flow. This is the explanation of the working principle of circulating fluidized bed boiler natural water circulation from Mr. Huang Zhong's "1000 Questions on Circulating Fluidized Bed Boiler".

　　It can be seen that the circulating fluidized bed boiler water circulation is inseparable from the water cooling wall. However, due to the internal structure of the boiler and the actual operation of the coal used, we find that most of the circulating fluidized bed boilers in power plants will have water-cooled wall wear problems. Whether it is normal wear and tear or abnormal wear and tear, the water-cooled wall will be worn and thinned. Normal wear and tear is a natural loss, the wear and tear thinning can be negligible. But abnormal wear thinning will seriously affect the safety and reliability of the boiler, once the burst tube leakage loss will be huge. Here will not make more than a statement, should be the vast majority of power plants using circulating fluidized bed boilers have experienced the pain of water-cooled wall burst.

　　Therefore, the water-cooled wall for power plants to prevent wear is of great significance. That power plant how to completely solve and prevent the water-cooled wall wear problem it! With the introduction of water-cooled wall grille anti-wear technology, the water-cooled wall wear problem is no longer a problem that cannot be completely cured. Through the practice of multiple circulating fluidized boilers, we have verified that the grille anti-wear can completely solve the water-cooled wall wear problem, and well prevent the water-cooled wall abnormal loss of thinning. At present, after the promotion and application of this technology, the grid anti-wear technology has been recognized by major power plants, completely cure the water-cooled wall wear problem.