Another important component is the slag cooler, which is primarily composed of a double-layer sealing sleeve that is welded with a fixed spiral blade inside the internal cylinder, along with an inlet and outlet slag device, inlet and outlet water device, transmission device, and base system. When the slag cooler rotates slowly, driven by the transmission, high-temperature slag from the boiler is guided forward in the internal cylinder of the sleeve. The cooling water flows in reverse in the jacket between the internal and external cylinder, gradually cooling down the hot slag.
The air cooler in the generator is used to cool down the stator, rotor windings, and stator core. There are typically two cooling modes: open-circuit ventilation and closed cycle. In open-circuit ventilation, the air around the generator is directly used as a cooling medium and comprises an air suction inlet, filter, inlet, outlet muffler, and outlet air channel. The air is suctioned by the fan and sent to the generator’s heating parts for cooling before being exhausted through the outlet muffler and air channel. This mode costs less, but it’s only applicable in clean ambient air conditions with no salt spray and relatively low temperatures.
Otherwise, it may lead to blockages in the channel or corrosion of the metal parts, which can affect safe operation. In contrast, the cooling air of a closed-cycle generator runs in a closed cycle in the cooling system, necessitating the installation of an air-water cooler to take away the heat in the air.
Fans with hydraulic coupling and pumps, such as feed pumps, blowers, and draught fans, are typically supplied with the main equipment. There are numerous applications of coolers in power plants, including furnace sampling, cooling of the wind machine and motor bearing, and oil-cooling mode for equipment like blowers, draught fans, water pumps, and air compressors. Additionally, the oil station generally adopts water-cooling mode, and there are over 20 kinds of central air-conditioning systems.