The pressure-bearing body of the corner tube boiler is composed of a stable structure. The downpipe, header and water-cooling wall are welded together to form a closed shell. The mixing pipe, steam return pipe, overflow pipe, unheated dewatering pipe and return pipe are uniquely arranged so that steam can be pre-separated before being circulated to the drum. When adjusting the load, the pressure changes are small and the steam purity is high. The boiler has a self-supporting function. The downwater pipes located at the four corners bear the weight of the entire boiler and have good earthquake resistance.
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