When should the small metal plate of the exhaust air damper be replaced?
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To ensure complete combustion of gas, we generally adjust it by regulating the suction force in the flue. Under what circumstances is it appropriate to adjust the size of the air valves?
The adjustment vents should be adjusted at least twice a year, in accordance with the ambient temperature. As for the adjustment of the suction flap and the intake vents, it is necessary to ensure that the flap is at an opening degree of 40–60; otherwise, the intake vents need to be adjusted either upward or downward to provide the flap with sufficient adjustment range
Of course, it is adjusted when the gas is not burning properly.
The large-scale adjustments are carried out twice a year: the air vents are opened in spring and closed in winter. The main reason for this is that temperatures are low in winter, resulting in greater air buoyancy, which makes it easier for air to enter the coke ovens； In spring, the temperature rises and the buoyancy of the air decreases, resulting in a reduced amount of air entering the coke oven; therefore, it is necessary to open the large air doors. During normal times, make minor adjustments based on the actual burning conditions.
When the gas flow rate changes slightly, adjust the suction force. When the amount of gas varies significantly and simple suction is not sufficient for complete combustion, both the air inlet and the suction force need to be increased.
In addition to controlling the air volume, the adjustment of the inlet valve can also regulate the amount of exhaust gas circulation and control the flue temperature. The opening degree must not exceed 2/3 of the entire air inlet at any time.
The key is to control the pressure at the fire viewing port to maintain a slight positive pressure. Adjusting only the suction force will cause significant changes in the pressure at the sight glass.
The key is to control the pressure at the fire viewing port to maintain a slight positive pressure. When the gas volume changes significantly and suction alone is not sufficient for complete combustion.
If the coking time changes significantly, and the gas supply amount changes, the air volume must be adjusted accordingly. It is unreasonable to rely solely on adjusting the flue suction; it is necessary to adjust the inlet opening as well in order to stabilize the system pressure at this level. Increase air volume: Raise the opening degree of the air inlets and increase the suction force in the flue to maintain stability in both upward and downward air currents. The operation to reduce the air volume is the opposite.
May I ask if the following two structural solutions for the exhaust gas disc can be used as alternatives to it? It’s similar to the structure of a three-way valve, as shown in the figure below. If it doesn’t work, why? Are there any defects or issues related to the manufacturing process and usage? Please, experts, share your thoughts. Among them, port 1 indicates the intake of air ； Exit No. 2 is connected to the coke oven ； Exit No. 3 is for the exhaust gases; the key issue is that it’s still not clear how the exhaust gas plate works exactly