GAS EXHAUST BORE OF SMOKE STACK MADE FROM COMPOSITE MATERIALS, METHOD OF MANUFACTURE AND ASSEMBLY OF SUCH BORE (VERSIONS) Russian patent published in 2003 - IPC

FIELD: construction engineering; mechanical engineering; protection of gas exhaust bores against flue gases. SUBSTANCE: sections of gas exhaust bore are multi-layer (5 to 50 layers for cylindrical parts of sections and to 200 layers for their bearing coupling belts). Each layer consists of two systems of interwoven filaments : warp filaments have circular or spiral direction and weft filaments have axial or spiral direction at volume ratio of wrap and weft filaments from 1:1 to 5:1; composite material of each layer of sections is made at volume ratio of interwoven glass filaments and polymer binder from 1:0.2 to 1:0.8; polymer binder contains composition of epoxytriphenol binder (60-80%) and phenol formaldehyde binder (20-40%); circular clearances between sections and/or several coupled units of sections are formed by their engageable edge circular belts of stepped form(from1 to 3 steps) and sealing circular members located in them; upper belts of lower steps have longitudinal slots and/or notches strengthened on the outside with local circular multilayer cover plates and/or elastic-flexible belt spiral made from composite materials; its turns are fastened by hardened adhesive and/or screws, pins or bushes. Each engageable section of exhaust gas bore or each member of sections is separately suspended from load-bearing framework by means of brackets and/or circular belts and frames. Sections of gas exhaust bore have through holes oriented radially or at angle relative to longitudinal axis which are used for delivery of cooling agent, atmospheric air for example to inner cavity. Lower section of exhaust gas bore secured on load-bearing floor or foundation has several through holes which receive smoke stacks with sealing units. Mounted on inner surface of through holes of lower section is smoke flow splitter made in form of metal plates rigidly secured together. Method of manufacture of exhaust gas bore includes winding reinforcing prepreg glass fabric filler on mandrel at penetration of polymer binder on bearing heating shafts at rate of motion of reinforcing filler from 0.007 to 0.03 m/s, tension from 10 to 80 kgf/cm at overlapping of layers by 5 to 30 mm, temperature of heating on shafts from 80 to 320 C and angles of embracing heating shafts from 90 to 150 deg.; ratio of prepreg glass fabric warp filaments and weft filaments from 1:1 to 5: 1; used as polymer binder is composition of epoxytriphenol binder (60-80%) and resol phenol formaldehyde binder or mixture (20-40%) formed from aniline phenol formaldehyde and resol phenol formaldehyde binders at ratio of components of 1:1 to 1:0.1 or mixture (20-40%) formed from aniline formaldehyde and epoxyaliphatic binders at ratio of components of 1:1 to 1:0.1 at volume ratio of glass filaments and polymer binder from 1:0.2 to 1:0.8; hardening of composite material is performed in thermal chamber on mandrel together with separating layers. EFFECT: enhanced operational reliability; improved quality. 14 cl, 57 dwg, 3 tbl