What to do if the temperature in the gas collection pipe exceeds 150°C after stopping the ammonia supply?
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Ammonia shutdown is divided into planned ammonia shutdown and sudden (unplanned) ammonia shutdown. Planned ammonia shutdowns are easier to handle, but what should be done in the case of an unplanned ammonia shutdown when the temperature in the gas collection duct exceeds 150°C?
The accident water isolation valve can be opened gradually. Also, pay attention to changes in the temperature of the gas collection pipes to prevent sudden cooling or heating from causing cracks or deformation at the welds of these pipes or at the water seal valves. Furthermore, if it is permissible to do so, open the rising pipe for the newly added coal batch and stop the coal extraction process. This is just my personal opinion for reference only
How many manufacturers install accident water shut-off valves? Where is it?
Emergency water valves are generally available on both sides of the gas collection duct.
Our company adds water to the circulating ammonia water pipeline directly from the water supply pipe of the primary cooler’s circulating cooling water. The flow rate of the circulating cooling water is above 4200, and the designed capacity for circulating ammonia water is 1500 cubic meters, which is sufficient to meet the needs in emergency situations. Moreover, we have modified the circuit of the circulating ammonia water pump to maximize the reliability factor. .
Under normal circumstances, when the temperature of the gas collection pipe is below 200 degrees Celsius, there is no need to open the emergency water valve. When the temperature exceeds 200 degrees Celsius, the emergency water valve can be opened intermittently, slowly, with a dedicated person monitoring the situation and keeping in contact with the staff working on the rising pipe. If the temperature starts to drop rapidly, operation must be stopped immediately to maintain a temperature of 150 degrees Celsius. If the ammonia solution is stopped, the furnace should be stopped immediately.
At this point, the flap of the carbonization chamber at the late stage of coking should be closed first to prevent the temperature of the gas collection pipe from rising. Monitor the temperature of the gas collection tube at all times; add clean water to it once it exceeds 200 degrees.
On both sides of the coke oven gas collector, clean water is generally supplied – that is, the emergency water mentioned earlier – to replace ammonia water. But the effect is generally not very good; it’s the best option we have. With this method, we have managed to hold on for up to 8 hours at most.
Gradually turn on the industrial water supply; if that doesn’t work, turn on a few more furnaces that have just been fed with coal, or release pressure. .
Still, make every effort to ensure that the circulating ammonia solution does not stop; a generator can be installed, along with additional backup equipment