Ефективність використання зануреного теплообмінника в сірчанокислотному хімічному реакторі з нерухомим шаром каталізатора

Abstract

The question of expediency of replacement of the heat-exchanging equipment in the sulphuric acid chemical reactor with a motionless layer of the catalyst is considered. The scheme of installation of the heat exchanger which is essentially differing from traditional is offered: unlike the used portable heat exchangers, heat-removing surfaces are established directly in a catalyst layer. On the basis of mathematical models of heattransfer in the motionless blown layer with the shipped surfaces in the presence of internal sources of warmth calculations of temperature fields in a layer are executed, the necessary area of the cooling surface and the law of its change is determined by layer height. As initial regime parameters at which the industrial sulphuric acid reactor works with a motionless layer and cooling of the reacting mix in portable heat exchangers are accepted. It is received that change of the specific area of a heat-removing surface corresponds to change of extent of transformation and heat release. The distance from an entrance to the reactor at which there is no need for the heat sink is defined. It is noted that increase in diameter of pipes leads to the insignificant growth of specific and total area of a surface of a bunch in connection with reduction of coefficients of a thermolysis of components of a layer. On the basis of the analysis of design data the conclusion according to which use of the shipped heat exchanger allows to carry out reaction of oxidation of SO2 in one step is drawn and at the same time to reduce dimensions of the reactor and metalexpense.