Improvement measures to prevent High temperature corrosion of Water Wall of Industrial Boiler in Chemical Plant
The main working principle of preventing high temperature corrosion of water wall of industrial boiler in chemical plant is to form a rotating direction opposite to the original jet motion by shifting the injection angle of the primary air flow nozzle. For the tangential circle with a small diameter, because the initial direction of motion after reverse wind cutting is opposite to the running direction of the main air flow in the furnace, the pulverized coal ejected is hindered by the main air flow and the upstream high temperature air flow. The speed of pulverized coal injection decreases rapidly, which enhances the stagnation time of pulverized coal in high temperature region and improves the combustion effect of pulverized coal. High altitude can be effectively prevented by using one reverse wind cutting. At the same time, the combustion stability in the furnace can be improved and the coking situation of the boiler can be reduced.
The side air technology is mainly adopted by installing the nozzle on the water wall of the high temperature corrosion zone or upstream of the high temperature corrosion area, and injecting air into the furnace of the boiler. The side wind technology can mainly control the reducing gas in the high temperature corrosion area and enhance the oxygen content in the local range.
3. To improve the operation control, the operation control measures such as increasing the excess air coefficient, several raw coal grinders are not put into operation at the same time, the particle size of pulverized coal is reduced, the leakage blocking equipment of air preheater is increased, and the high temperature of ash blocking system is prevented. To put an end to high temperature corrosion.
