What causes the overheating of the four tubes of boiler water wall?

First, in order to prevent the superheater tube from overheating, the boiler should be started and stopped in strict accordance with the operation regulations and the start-stop curve, and the boiler parameters and superheater tube wall temperature should be controlled within the allowable range; Closely monitor the main indicators such as boiler steam parameters, evaporation capacity and water level to prevent accidents such as over-temperature and over-pressure, full water and water shortage; Do a good job in boiler combustion adjustment, prevent flame deflection, pay attention to control the fineness of pulverized coal, use air reasonably, prevent coking, reduce thermal deviation and prevent boiler tail re-ignition; Strengthen the management of soot blowing and soot blower to prevent serious ash on the heated area; Ensure that the quality of boiler feed water is normal and the quality of soda water in operation is qualified.

Secondly, for the high temperature creep type, the medium flow distribution can be reasonable by improving the heating surface; Improve the combustion in the furnace and prevent the combustion center from being too high; Chemical cleaning, removal of foreign bodies, deposits and other methods to prevent. For the stress oxidation crack type, the damaged pipeline can be replaced because the service life of the pipeline is close to the design life. Oxidation thinning should improve the protective measures of superheater.

Third, in addition, reduce the frequency and speed of fly ash hitting the pipeline or increase the wear resistance of the pipeline to prevent fly ash wear, such as: changing the flow direction and velocity field through the wear-resistant deflector of the water wall; Set a dust removal device in the furnace to prevent local smoke velocity from being too high; Wear-resistant guide vanes are installed on the surface of easy-to-wear pipes, and the patented technology of wear-resistant CFB boiler water wall in Huang Lin is selected. It is also necessary to select the furnace type suitable for coal, improve the fineness of pulverized coal, adjust combustion and ensure complete combustion.

Fourth, pay attention to shutdown protection to prevent oxygen corrosion. When the new boiler is put into use, chemical cleaning should be carried out to remove rust and stolen goods, and a uniform protective film should be formed on the inner wall to make the water quality meet the standard during operation, and the PH value should be appropriately lowered or the content of chloride and sulfate in the boiler should be increased.

Five, to prevent stress corrosion cracks should pay attention to eliminate the residual stress of the pipeline; Strengthen protection during installation. Pay attention to anti-corrosion when stopping the furnace; Prevent the condenser from leaking and reduce the chlorine ion and oxygen content in the steam.

6. Pay attention to the anti-wear technology of water wall of abrasion-resistant CFB boiler in Huang Lin.