Heat store component and heat exchangers fitted therewith, in particular for flue gas cleaning systems of power plants

Abstract

A heat store component for passage of a gas flow, in particular, in heat exchangers of flue gas cleaning systems, is provided, including: a mounting forming an inlet and an outlet side of the heat store component for the gas flow fed therethrough; and a first and a second heat storage medium arranged one behind the other in the gas flow direction and each including a plurality of substantially parallel flow channels. The second heat storage medium is formed from one or more honeycomb blocks, which include a body made in one-piece manner of a plastics material and incorporating a plurality of parallel flow channels separated by channel walls, wherein the plastics material includes a plastic containing virgin polytetrafluoroethylene (PTFE) as a fraction of ca. 80% by weight or more and optionally a high performance polymer differing from the PTFE as a fraction of ca. 20% by weight or less.

1 . A heat store component for the passage of a flow of gas therethrough, in particular in heat exchangers of flue gas cleaning systems, comprising a mounting, a first heat storage medium and a second heat storage medium, wherein the mounting forms an inlet side and an outlet side of the heat store component for the flow of gas that is to be fed therethrough, wherein the first and second heat storage media are arranged one behind the other in the direction of flow of the gas between the inlet side and the outlet side of the mounting and each comprises a plurality of substantially parallel flow channels, wherein the second heat storage medium is formed of one or more honeycomb blocks, wherein the honeycomb block or the honeycomb blocks comprise a body that is produced in one-piece manner from a plastics material and incorporate a plurality of flow channels which are arranged in parallel with one another and are separated from each other by channel walls, wherein the plastics material comprises a plastics which contains virgin polytetrafluoroethylene (PTFE) as a fraction of ca. 80% by weight or more and optionally a high performance polymer differing from the PTFE as a fraction of ca. 20% by weight or less. 
     
     
         2 . The heat store component in accordance with  claim 1 , wherein the second heat storage medium extends over ca. 10% to ca. 60% of the flow path from the inlet side to the outlet side of the heat store component. 
     
     
         3 . The heat store component in accordance with  claim 1 , wherein the first heat storage medium is of identical construction to the second heat storage medium, wherein the first and the second heat storage medium are optionally connected to form a unit. 
     
     
         4 . The heat store component in accordance with  claim 1 , wherein the first heat storage medium is formed of steel, stainless steel, Cortén, enamel coated steel, steel coated with an epoxy resin corrosion protector or highly corrosion resistant nickel-chromium-molybdenum alloys. 
     
     
         5 . The heat store component in accordance with  claim 1 , wherein the mounting is built up of two parts, wherein a first part of the mounting comprises the inlet side and a second part comprises the outlet side of the heat store component and wherein the first part is connectable to the second part, preferably directly, for forming the mounting. 
     
     
         6 . The heat store component in accordance with  claim 1 , wherein the mounting is in the form of a basket structure, wherein a bottom side and an upper side preferably comprise mutually spaced struts and preferably form the inlet and outlet sides of the heat store component at the same time. 
     
     
         7 . The heat store component in accordance with  claim 6 , wherein each of the struts extends substantially entirely over the surface of the bottom side and the upper side of the heat store component at which the flow channels of the heat storage media end. 
     
     
         8 . The heat store component in accordance with  claim 1 , wherein the mounting comprises four side walls, of which two or more side walls and in particular mutually oppositely located side walls are in the form of closed surfaces. 
     
     
         9 . The heat store component in accordance with  claim 1 , wherein all of the side walls are open and bounded only by bars. 
     
     
         10 . The heat store component in accordance with  claim 8 , wherein the heat store component has a substantially block-like shape, optionally with a trapezoidal bottom side and upper side. 
     
     
         11 . The heat store component in accordance with  claim 8 , wherein two of the side walls have bars connected to form a framework, wherein the frameworks are connected to two or more struts in the region of the bottom side and the upper side, wherein the mounting optionally consists of the two frameworks and the struts connecting them. 
     
     
         12 . The heat store component in accordance with  claim 1 , wherein the mounting is produced from structural steel, stainless steel, Cortén, enameled steel, steel covered with epoxy resin corrosion protector or special materials made from highly corrosion resistant nickel-chromium-molybdenum alloys. 
     
     
         13 . The heat store component in accordance with  claim 1 , wherein the virgin PTFE comprises a co-monomer fraction of ca. 1% or less by weight, preferably ca. 0.1% by weight or less, wherein optionally, the virgin PTFE and optionally the high performance polymer differing from the PTFE have a mean primary particle size D 50  of ca. 10 μm to ca. 200 μm, preferably of ca. 10 μm to ca. 100 μm. 
     
     
         14 . The heat store component in accordance with  claim 1 , wherein the plastics material that has been processed into the form of a honeycomb block exhibits a tear resistance, which, measured in accord with ISO 12086-2 on the basis of a strip-like test piece having a cross section of 1×5 mm 2 , amounts to ca. 10 N/mm 2  or more, in particular ca. 15 N/mm 2  or more, preferably ca. 20 N/mm 2  or more and even more preferably ca. 25 N/mm 2  or more, but preferably however ca. 35 N/mm 2  or less, and/or that the elongation at break of the plastics material of the honeycomb block, measured in accord with ISO 12086-2 on the basis of a strip-like test piece having a cross section of 1×5 mm 2 , amounts to ca. 80% or more and in particular to ca. 100% or more, preferably to ca. 150% or more, and more preferably to ca. 200% or more. 
     
     
         15 . The heat store component in accordance with  claim 1 , wherein the average roughness value Ra of the surfaces of the honeycomb block as measured in the longitudinal direction of the honeycomb block channels amounts to ca. 10 μm or less, and in particular ca. 5 μm or less, and/or in that the surface roughness Rz of the surfaces of the honeycomb block as measured in the longitudinal direction of the flow channels of the honeycomb block amounts to ca. 50 μm or less, in particular ca. 40 μm or less, preferably ca. 30 μm or less, and more preferably ca. 20 μm or less. 
     
     
         16 . The heat store component in accordance with  claim 1 , wherein the plastics material of the honeycomb block comprises a non-metallic filler and/or a metallic filler, wherein the particle size D 50  of the respective filler amounts to preferably ca. 100 μm or less. 
     
     
         17 . The heat store component in accordance with  claim 16 , wherein the non-metallic filler is contained in the plastics material as a fraction of ca. 80% or less by weight, preferably ca. 40% or less by weight and more preferably ca. 35% or less by weight, and/or in that the metallic filler is contained in the plastics material as a fraction of ca. 90% or less by weight, preferably ca. 60% or less by weight. 
     
     
         18 . The heat store component in accordance with  claim 16 , wherein the entire volumetric fraction of the non-metallic and metallic fillers in the plastics material amounts to ca. 90% or less by volume, preferably ca. 50% or less by volume and more preferably ca. 40% or less by volume. 
     
     
         19 . The heat store component in accordance with  claim 1 , wherein the plastics material of the honeycomb block has a thermal conductivity of ca. 0.3 W/(m·K) or more and/or honeycomb block has a thermal capacity of ca. 0.9 J/(g·K) or more. 
     
     
         20 . The heat store component in accordance with  claim 1 , wherein the channel walls of the flow channels of the honeycomb block have a thickness of ca. 0.8 mm to ca. 2 mm, preferably of ca. 0.8 mm to ca. 1.6 mm. 
     
     
         21 . A heat exchanger manufactured using a plurality of heat store components in accordance with  claim 1 . 
     
     
         22 . The heat exchanger in accordance with  claim 21 , wherein the heat store components are placed in the heat exchanger such as to be exchangeable. 
     
     
         23 . The heat exchanger in accordance with  claim 21 , wherein the heat exchanger is in the form of a rotor and optionally comprises chambers for accommodating the heat store components.