What are the causes of high oxygen content in gas and how to prevent it?

The reasons are roughly: 1. The blower valve and the down valve are opened at the same time, and the air directly enters the gas main pipe through the down valve. 2. The blow valve and down valve are not closed properly, causing air to leak into the system. 3. The carbon layer is low or the blowing intensity is strong, causing the carbon layer to blow over or form a wind tunnel. The air entering the furnace is not completely burned and enters the gas system during the recovery stage. 4. The furnace temperature is low and the air is not completely burned in the carbon layer. 5. The nitrogen adding valve is not closed tightly, causing air to leak into the gas system. The main preventive measures are: 1. Set the blower valve and the down valve to interlock on the oil line to prevent the two valves from opening at the same time. 2. Set up valve position detection and realize interlocking on the microcomputer. When the key valve is not closed in place, the program automatically enters a safe parking state. 3. Strengthen valve maintenance to reduce the number of failures. 4. Strengthen the monitoring of furnace temperature and carbon layer to prevent the carbon layer from being too low or the furnace temperature from being too low. 5. Keep abreast of changes in furnace conditions and promptly discover wind tunnels or air deviations.

2# * aoye613 gave a very comprehensive answer

There are two main reasons for the high oxygen content of coal gas, one is the process and the other is the equipment.； The equipment reason is internal leakage of the pier valve, the process is low furnace temperature or there is a wind tunnel in the gas generator. The preventive measure is to regularly check and repair the pier valve to prevent internal leakage of the pier valve. Strict process operation, control the temperature above and below the furnace, increase and decrease the load of the gas generator slowly, and control the wind pressure.