Metal hydrides plate-fin heat exchanger

Abstract

Disclosed is a metal hydride plate-fin heat exchanger, which belongs to the industrial heat exchange and energy saving technique field. The invention comprises: an upper cover plate, a fluid path flat tine fin, a spacer plate, reaction bed units, a fluid path tail sealing tape, a lower cover plate, a bolt component, a through hole flanged disc, a blind plate flanged disc, a fluid path head sealing tape, a hydrogen pipe, a fluorine rubber flange gasket, a rear enclosing cover, a front enclosing cover, a liquid inlet, a liquid outlet, a filter sheet gasket and a millipore filter sheet. Each reaction bed unit includes an upper cover plate, a unit tail sealing tape, a unit lateral sealing tape, a lower cover plate and a unit serrate fin. Each reaction bed unit has an open end and is welded with a serrate fin in the inside, thereby the heat exchange area and the effective thermal conductivity are greatly increased, and the intensity of a heat exchange unit can also be ensured under the condition of increasing the heat capacity of the heat exchange unit indistinctively. In addition, filtration and sealing difficulties of metal hydrides are greatly reduced by adopting the structure that all the reaction bed units are connected and fixed on the through hole flanged disc in parallel, meanwhile, the mass transfer capability of hydrogen will not be reduced.

Description

technical field [0001] The invention relates to a plate-fin heat exchanger, in particular to a metal hydride plate-fin heat exchanger, which belongs to the technical field of industrial heat exchange and energy saving. Background technique [0002] Due to the huge advantages of metal hydride alloys in hydrogen storage and energy utilization, the development and application of metal hydride alloys are currently in the ascendant. However, due to the low effective thermal conductivity of hydrogen storage alloys, they have good heat and mass transfer capabilities. Research on metal hydride heat exchangers has become a very urgent problem. [0003] After searching the existing technology, the structure of metal hydride heat exchangers at home and abroad is generally limited to the use of tube heat exchangers; that is, the alloy is inside the tube, and the heat medium fluid is cooled or heated outside the tube, see patent 200420047872.5, Alternatively, the heat medium fluid flows...

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Problems solved by technology

But it also has the following disadvantages: First, because the cross-section of the tubular heat exchange unit is a circle, as we all know, for the plane geometry of the same area, the circumference of the circle is the shortest, that is to say, for the same internal volume, the same length For a regular heat exchange unit, when the cross section of the heat exchange unit is circular, the side area of ​​the heat exchange unit is the smallest, that is, the heat exchange area that the same volume of alloy can contact is the least; secondly, due to the small heat exchange area, the tube type The average thickness of the alloy layer inside the heat exchange unit is relatively large. On the one hand, the effective thermal conductivity of the pulverized alloy is very low; on the other hand, the settlement effect of the alloy is relatively large, and local stress is prone to occur when the alloy absorbs hydrogen and expands. Concentration, the strength requirements for the heat exchange unit are relatively large, and relatively thick tube walls are required, which will lead to a large heat capacity of the heat exchange unit bed

[0004] One of the methods to increase the heat transfer area and effective thermal conductivity is to use a flat heat transfer unit with a square cross section, but the plate heat exchangers or plate-fin heat exchangers currently used in the entire heat transfer field are not suitable for Heat transfer requirements between metal hydride alloy solids and heat medium fluids, hydrogen mass transfer requirements between metal hydride alloys and hydrogen sources, and strength requirements for reaction bed expansion by hydrogen absorption and expansion of alloys

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