Working out of energy effective processes and the equipment for manufacture of different function polymeric pipes
Existing models and techniques of calculations of process of cooling of one- and multi-layered polymeric pipes of different function are analysed, the major factors influencing stability of process and quality of finished goods are considered. It is established that existing models and techniques concern only single-layered smooth pipes.
Physical and mathematical models, algorithm and the program of calculations one- and double-sided, process of cooling of the multilayered goffered polymeric pipes are developed. It is established that in the course of unilateral external cooling sites of an inside layer of the goffered pipe under goffers are cooled very slowly that is caused by considerable thermal resistance of air in goffers walls. During time of simultaneous external and internal cooling of a pipe cooling time is reduced several times.
It is improved physical and mathematical models, algorithm and the program of calculations of process of cooling of smooth polymeric pipes in which features of cooling of multilayered pipes and heat exchange on an internal surface of a pipe are considered. The developed algorithm and the program of calculations of process of cooling of smooth polymeric pipes allow to define rational parameters of systems of cooling.
Process of bilateral cooling of the two-layer goffered polymeric pipes is experimentally investigated. Adequacy of the developed mathematical models (the deviation of results of calcula-tions from experimental data for various conditions of process does not exceed 7…25 %) is con-firmed.
It is established that during cooling of the multilayered goffered polymeric pipes in case of use of air for internal cooling process time is reduced on 15…40 %, and in case of use of an aero-water mixture on 20…80 %.
The developed algorithm and the program of calculations of process of cooling of smooth polymeric pipes have allowed to define rational parameters of systems of cooling that has provided possibility to reduce time of cooling to 80 %, to reduce resource-demanding process of manufacturing of polymeric pipes on 10…15 % and power consumption to 30 %, and also to raise quality of received products.
It is established that application of bilateral cooling of polymeric pipes reduces influence of reference temperature of cooling water on duration of process. It allows to use cooling water with temperature 6…20 °С without change of parameters of work of a trumpet line and to avoid superfluous power expenses in a contour of system of cooling.
Possibility of rationalization of process of cooling of polymeric pipes is experimentally investigated by application of discrete system of cooling (alternation of sites of water and air cooling). It is established that application of such system allows to reduce the expense of cooling water almost to 50 % and to reduce length of a zone of cooling by 10 % in case of cooling of the goffered polymeric pipes, in case of smooth pipes on 47 % and 22 %, accordingly.
Recommendations about the organization of technological process of cooling of one- and multilayered smooth and goffered polymeric pipes of different function are made.