What is eagle iron in a boiler?
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While organizing the operating procedures for the organic heat carrier furnace recently, I couldn’t find out where the eagle iron is located inside the boiler. Could you please advise me? Specifically, the matching of the blower and exhaust fan in coal-fired boilers should be appropriate, and the negative pressure in the furnace should be maintained between 2–3 millimeters of water column. The combustion section of the coal-fired chain grate should be uniform, with a flat fire bed; the flames should be dense and even, appearing bright yellow, without any holes or cold air inlets as well as coke lumps. The grate operating speed should be matched to the load; the ignition point should be 20–40 centimeters away from the coal gate, and combustion should be completed 50 centimeters in front of the slag outlet or the eagle iron. Slag discharge is smooth without any accumulation; the slag discharge port is well sealed. The exhaust smoke is light yellow in color, and the exhaust temperature is within the specified range.
The eagle irons in the boiler are located on both sides at the rear of the combustion zone of the grate. Its function is to allow the burned slag to fall smoothly into the slag hopper. Ensure that coal slag does not clog the grate.
The eagle irons are arranged in rows at the rear of the grate combustion zone； Its function is to allow the slag to fall smoothly into the slag hopper, preventing it from getting stuck on the grate; it is now rarely used.
Eagle Iron is located at the end of the chain grate, just before it turns; it has a shape similar to an eagle’s beak, and is made of cast iron, which is why it gets its name. It is designed to prevent slag from falling between the open grates at the rear axis and to extend the time that the slag remains on the grate, thereby facilitating its complete combustion; in other words, it serves to retain the slag. However, it cannot prevent air leakage at the rear, which results in poor thermal efficiency. Due to its simple structure, ease of manufacture, and low failure rate, it has been widely used.