Analysis of process abnormalities and nitrogen system faults in trolley annealing furnace

1, Process abnormality of trolley annealing furnace:
If several steps are missed during the setup process, process parameters can be changed in advance before the process reaches its stage. If it is already running, it cannot be stopped, but please re-enter a new process under the process. It is worth noting that some coil materials are not discharged from the furnace after insulation, but instead choose side cooling for cooling. At this point, it is necessary to check whether the side cooling method was added during the input process.
2, Fault of nitrogen system:
In order to keep the steel coils annealed in the trolley annealing furnace free of oil stains, it is necessary to remove the residual rolling oil or lotion in the coiler during the rolling stage before annealing. Of course, cleaning cannot maintain overall cleanliness, so it is necessary to fill with nitrogen gas with a purity greater than 99.9% to protect the coil. Its purpose is to prevent residual oil from burning, drying, oxidizing, and adhering to the surface of the coil at high temperatures, thereby affecting the appearance of the coil.
The larger oxygen content of the annealing furnace is ≤ 0.2%. If it exceeds this value, the following precautions should be taken:
(1) The nitrogen pressure of the nitrogen generator should be greater than 5 bar (0.5 MPa) to ensure that the manufactured nitrogen can be transported to the trolley annealing furnace.
(2) The nitrogen purity of the nitrogen generator should be greater than 99.9%, so the oxygen content obtained from the annealing furnace will be less than 0.1%.
(3) Three nitrogen generators and three air compressors should be started. The long-term operation of the air compressor can cause an increase in the temperature of the cooling water, generate scale, and affect the discharge of the air compressor. Poor drainage of the air compressor can also lead to impure nitrogen gas.
(4) The oxygen content analyzer needs to be calibrated regularly. The yellow hose in the analyzer is an important component for detecting oxygen content. It must be vertical and free from knots. If the yellow hose falls off, the oxygen content will not be detected.
(5) The equipment of the trolley annealing furnace should be checked regularly. The chimney cover on the top of the stove cannot be washed away. You can choose to use a 200g gasket to tighten it. There is a pipe on the top of the furnace that contains nitrogen gas. Check if the pipeline will not fall off.