Heat transfer plate packs and baskets, and their utilization in heat recovery devices

Claim 1

In a pack of heat transfer plates for regenerative heat exchangers, which pack is operationally adapted to absorb heat from a flue gas flowing in one axial direction along the main flow axis and release such heat to a combustion air flowing in another axial direction, including: first and second mutually identical profiled plates which are arranged in mutually contiguous relationship and which form a first channel for passage of a heat exchange media, said first channel extending between adjacent opposing surfaces of the first and second plates, in which each of said plates are provided thereon mutually parallel sets of straight continuous double ridges which project symmetrically from both opposite sides of each of said plates; said plates being oriented such that the double ridges of the first plate intersect the double ridges of the second plate, and said first and second plates being in contact with one another solely at points of intersection of said intersecting double ridges; said double ridges of the first and second plates extending symmetrically and obliquely in mutually opposite directions relative to the main flow axis of the heat exchange media flowing through said pack, in a manner that a substantially unobstructed flow of media in an axial direction may be established in said first channel, the improvement comprising: such pack including a third plate having provided thereon continuous extending parallel channel forming means with one side thereof being in contiguous relationship with said second plate; and said channel forming means of said third plate forming a second channel between the adjacent surfaces of said second and third plates in a manner that a substantially unobstructed flow of media, in both axial directions, may be established in said second channel.