Plate-and-shell type coal economizer

Through the design of the corrugated plate heat exchange core and tubular circulation channel of the plate and shell economizer, the problem of low heat exchange efficiency caused by the density difference between flue gas and water is solved, efficient and compact flue gas water heat exchange is achieved, and the cost is reduced Production costs and risk of dust accumulation.

CN104033881AInactive Publication Date: 2014-09-10TONGJI UNIV
7 Cites 6 Cited by

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
TONGJI UNIV
Filing Date
2013-03-04
Publication Date
2014-09-10
Estimated Expiration
Not applicable · inactive patent

AI Technical Summary

Technical Problem

Due to the large gap between flue gas and water densities and heat transfer coefficients in existing power station boiler economizers, the water side temperature rise is not obvious, and the heat exchange area or water channel length needs to be increased, resulting in low compactness of the equipment, large area, high cost and Easy to accumulate dust.

Method used

Adopting a plate and shell economizer structure, using corrugated plate heat exchange core and tubular circulation channel design, the flue gas and water cross-flow and countercurrent exchange heat, increasing the flue gas fluid turbulence, combined with laser welding sealing technology, forming a compact and efficient Heat exchange system.

Benefits of technology

It improves heat exchange efficiency, reduces the risk of equipment dust accumulation, reduces production costs, and achieves efficient water side heating and low pressure loss.

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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.
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Citation Information

Patent Citations

  • Plate heat exchanger

    CN1343300A

  • Plate type economizer for power station boiler

    CN202253576U

  • Primary surface heat exchanger for flue gas waste heat recovery

    CN202267394U

  • Plate-type heat exchanger

    CN202734627U

  • Plate-shell-type coal economizer

    CN203115974U

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