Pure countercurrent modular combined heat exchanger

Abstract

The invention discloses a pure countercurrent modular combined heat exchanger. The heat exchanger is arranged by adopting a vertical or horizontal square flue pipe and comprises a steam inlet main pipe, an inlet large header, an outlet large header, an inlet small header, an outlet small header, a plurality of heat exchange pipe sets arranged in a combined mode, a steam outlet main pipe, a contraction inlet section cylinder body, an expansion outlet section cylinder body and a steady flow straight section cylinder body. Each heat exchange pipe set is composed of a plurality of heat exchange pipes with high specific surface areas. The contraction inlet section cylinder body and the expansion outlet section cylinder body are respectively arranged at two ends of the steady flow straight section cylinder body; the inlet small header is located in the expansion outlet section cylinder body, and the outlet small header is located in the contraction inlet section cylinder body; the steam inlet main pipe is connected with the inlet large header, and the steam outlet main pipe is connected with the outlet large header. The heat exchanger is small in size and lower in operation resistance; when vertical arrangement is adopted, the phenomenon of smoke dust blockage can be completely avoided; a plurality of groups are respectively controlled in parallel to realize flexible load adjustment.

Description

technical field [0001] The invention relates to the technical field of energy saving and environmental protection, in particular to a pure countercurrent modular combined heat exchanger. Background technique [0002] Flue gas waste heat recovery heat exchange equipment has been widely used in our country. Most of the traditional flue-type waste heat boilers or heat exchange equipment adopt serpentine tube heat exchanger structure, and the flue gas washes the heat exchange tubes horizontally. The heat field adopts the finned tube structure. However, limited by the requirement of flue gas side resistance drop and wear of heat exchange tubes, the flue gas flow rate of the horizontal flushing tube is generally controlled within 10m / s; The attenuation of the heat exchange performance of the device is relatively large; even in some occasions with high dust content, only light tubes with poor heat exchange performance can be used for heat exchange, so the equipment becomes huge a...

AI Technical Summary

Problems solved by technology

However, limited by the requirement of flue gas side resistance drop and wear of heat exchange tubes, the flue gas flow rate of the horizontal flushing tube is generally controlled within 10m / s; The attenuation of the heat exchange performance of the device is relatively large; even in some occasions with high dust content, only light tubes with poor heat exchange performance can be used for heat exchange, so the equipment becomes huge and the metal consumption is high; the above limitations greatly reduce The cost performance of flue heat exchanger affects the application of waste heat recovery technology

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