Vertical type condensing heat exchanger and heat exchange method thereof

Abstract

The invention provides a vertical type condensing heat exchanger and a heat exchange method thereof. The vertical type condensing heat exchanger comprises a condenser body, an in-tube cooling liquid heat exchange unit and an out-tube steam condensing heat exchange unit. The condenser body comprises a cylinder unit, a heat exchange tube bundle is arranged in the cylinder body, a first head and a second head are arranged on two sides of the cylinder unit respectively, a condensate collector is arranged between the cylinder unit and the second head, an in-tube cooling liquid cooling unit is arranged in the cylinder unit, and the out-tube steam condensing heat exchange unit is arranged on the cylinder unit. Cooling liquid is partitioned by a partition plate in the upper head to flow in two directions, namely from top to bottom and from bottom to top, and absorbs out-tube steam condensing released heat in in-tube travel, high-pressure steam returns to flow in a shell pass to wash a cooling tube transversely to achieve out-tube condensing, and condensate collected by each baffle board is subcooled in the second head, so that reliability of a heat exchange system is guaranteed.

Description

technical field [0001] The invention relates to thermal equipment in the technical field of energy efficient utilization, in particular to a vertical condensation heat exchanger and a heat exchange method thereof. Background technique [0002] The vertical condensing heat exchanger usually adopts a shell-and-tube structure in which "the coolant sweeps across the heat exchange tube and flows from top to bottom, and condenses in the high-pressure steam tube". After the superheated steam enters the condenser, it goes through three processes of cooling, saturated condensation and subcooling, and achieves the purpose of heat exchange by releasing sensible heat and latent heat. [0003] However, as the amount of condensation continues to increase in the current shell and tube structure, it is easy to cause the accumulation of condensed liquid film, and the formed thick liquid film covers the heat exchange surface; at the same time, the cooling of the steam in the tube requires a l...

AI Technical Summary

Problems solved by technology

[0003] However, as the amount of condensation continues to increase in the current shell and tube structure, it is easy to cause the accumulation of condensed liquid film, and the formed thick liquid film covers the heat exchange surface; at the same time, the cooling of the steam in the tube requires a large amount of cooling liquid to wash the heat exchange tube. Due to the small temperature rise of the coolant, a coolant with a higher mass flow rate is required; the steam condenses in the heat exchange tube, and the flow pattern changes continuously, gradually changing from an annular flow to a plug flow, and the bottom of the heat exchange tube may be filled with condensate , resulting in no steam condensation in some pipe sections, and it becomes a single-phase heat exchange

For vertical condensing heat exchangers, there are few designs that use condensation outside the steam tube, mainly because the length of the vertical heat exchange tube is relatively long, and the condensation outside the tube causes the liquid film to grow along the outer wall of the tube, and the thickness of the liquid film continues to increase, resulting in Deterioration of heat transfer effect

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