Plate-and-shell type coal economizer

Abstract

The invention belongs to the technical field of power station boiler waste heat recycling energy-saving equipment and relates to a plate-and-shell type coal economizer. The plate-and-shell type coal economizer comprises a corrugated plate heat exchange core body (1), a heat exchanger shell (2), a first and a second water inlet / outlet water tank (3, 3') and a first and a second exhaust gas inlet / outlet pipeline (4, 4'), wherein the corrugated plate heat exchange core body (1) is mounted in the heat exchanger shell (2), the first and second water inlet / outlet water tanks (3, 3') are respectively arranged at the upper and lower ends of the front side of the corrugated plate heat exchange core body (1), and the first and second exhaust gas inlet / outlet pipelines (4, 4') are respectively arranged at the upper and lower sides of the corrugated plate heat exchange core body (1). The plate-and-shell type coal economizer solves the problem that the length of a water passage needs to be increased to solve the problem of unapparent water heating due to the great difference between an exhaust gas density and a water density, and meanwhile, a corrugated passage at the exhaust gas side enables the exhaust gas flow turbulivity to be increased and the heat transfer efficiency to be improved; the blockage due to ash accumulation happens rarely, even if the ash is accumulated, the cleaning is easy to finish.

Description

technical field [0001] The invention belongs to the technical field of waste heat recovery and energy-saving equipment for power plant boilers, and relates to a plate and shell economizer. Background technique [0002] At present, the economizers used in power plant boilers are mainly tube type and finned tube type. The condensed water goes in the pipe, and the flue gas passes through the fan to blow the pipe to realize heat exchange. The cross-flow heat exchange is adopted between the flue gas and the condensed water. However, this kind of economizer has low compactness, consumes a large amount of pipes, and occupies a large area. Moreover, because the flue gas is in vertical contact with the heat exchange tubes, the flow resistance increases, dust is easy to accumulate, and the wear of the heat exchange tubes increases. The lifespan of the economizer. [0003] In the prior art, the utility model patent whose patent publication number is CN202253576U provides a plate-type...

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