ts rear part is arranged with a dense convection pipe bundle between the upper and lower boiler cylinders; The high temperature smog after combustion shall stand twice before being flushing transversely to the heat accepting surfaces, and shall introduced to the coal saver and singly arranged, and allowed to flow into duster and exhausted from the chimney in the end. 3945105508525939223-blid-1751829430784655388

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