Gate valve must be added at the entrance of slag cooler. First, the internal maintenance of slag cooler must be isolated, and it can't be achieved without valves. Second, sometimes the refractory near the slag outlet of the air distribution plate falls off and blocks the slag outlet, or the slag outlet is blocked due to improper operation and local coking, which is very suitable for spraying slag in the slag pipe during dredging, resulting in safety problems.
As said on the second floor, with only one manual gate valve, the electric failure rate will be very high.