Why is the oxygen content high in the coke oven off-gas? Help needed
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Why is the oxygen content high in the coke oven off-gas? Help needed
Check if there are any leaks in the tar box
How high is the oxygen content? High for a long time? Or occasionally high?
Air is leaking into the waste gas system; check whether the high-pressure ammonia solution has been running for too long, and also verify whether the gas collection duct is operating under negative pressure
Most of the time it is a problem with high-pressure ammonia water in the coke oven, but other possibilities cannot be ruled out. The original poster hasn’t explained things clearly – where exactly is the oxygen level too high? By how much is it over the limit? Is the blower’s suction power strong?
If high-pressure ammonia water is used for coal charging, it is mostly due to the excessive oxygen content in the gas caused by the coal charging operation. The scientific solution is to employ variable pressure control for high-pressure ammonia water – adjusting the pressure of this ammonia water automatically according to the coal loading process. At the beginning of coal loading, when the amount of flue gas is low, the pressure of the high-pressure ammonia water is set lower (to prevent too much air from being drawn in); as more coal is added and the amount of flue gas increases, the pressure of the high-pressure ammonia water is gradually increased. In this way, it is possible to balance both the oxygen content in the gas and the amount of smoke generated during coal loading.
The questions posed are too general and simplistic to allow for any analysis. Analysis of reasons for high oxygen content: 1. Whether the testing equipment and instruments are functioning properly. 2. Air being drawn in due to leaks in the negative pressure system. 3. Ammonia solution at high pressure being in use for too long, allowing air to be drawn in from the smoke exhaust vehicle. 4. Coal being loaded without first shutting down the relevant systems during coke oven operations. If there are other reasons, it will be necessary to analyze the specific manifestations of high oxygen content
If high-pressure ammonia water is used for coal charging, it is mostly due to the excessive oxygen content in the gas caused by the coal charging operation. The scientific solution is to employ variable pressure control for high-pressure ammonia water – adjusting the pressure of this ammonia water automatically according to the coal loading process. At the beginning of coal loading, when the amount of flue gas is low, the pressure of the high-pressure ammonia water is set lower (to prevent too much air from being drawn in); as more coal is added and the amount of flue gas increases, the pressure of the high-pressure ammonia water is gradually increased. In this way, it is possible to balance both the oxygen content in the gas and the amount of smoke generated during coal loading.