Novel plate type economizer

Abstract

The invention belongs to the technical field of power station boiler afterheat recycling energy-saving devices and relates to a plate type economizer. The plate type economizer comprises a corrugated plate heat exchange core (1), a heat exchanger housing (2), smoke inlet-outlet pipelines (3, 3') and water inlet-outlet water tanks (4, 4'), wherein the front side and the back side of the heat exchanger housing (2) are respectively connected with the smoke inlet-outlet pipelines (3, 3'); the left side and the right side of the heat exchanger housing (2) are respectively connected with the water inlet-outlet water tanks (4, 4'); and clapboards (19, 19') are arranged inside the water inlet-outlet water tanks (4, 4'). With the adoption of the plate type economizer, the problem that the flow differences of water and smoke are large is solved, the turbulence intensity of smoke flow is increased, and the heat transfer efficiency is improved; and a smoke flow channel has the function of self-cleaning dusts, so dust accumulation to block does not easily happen.

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-type 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. Cross-flow heat exchange is adopted between flue gas and condensed water. However, this kind of economizer has poor heat transfer capacity, consumes a lot of pipes, occupies a large area, and 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. Affect the life of the economizer. [0003] In the prior art, there are few reports on plate-type economizers, and the utility model patent with the patent publication number o...

AI Technical Summary

Problems solved by technology

In this patent, the distance between the flue gas inlet and outlet plates is only half of the corrugation height, which affects the flue gas inlet and outlet flow and increases the flue gas resistance

At the same time, the corrugated plates of the plate economizer are smooth and straight through. Although the flue gas resistance can be reduced, there are no enhanced heat transfer measures on the flue gas side, which will inevitably result in a low heat transfer coefficient on the flue gas side, which will inevitably lead to overall energy saving. The result of poor heat transfer effect of the coal burner

In addition, due to the large difference in density and heat transfer coefficient between flue gas and water, if the water side series connection is not considered, it can only be compensated by increasing the heat transfer area, which will inevitably increase the volume and cost of the economizer

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