Maatouk A. Regenerative heat exchange in the fractionation and compression of the gas of chemical production

The research object is the process of regenerative heat exchange in the fractionation and compression of gas units and their complexes. The purpose of the work is to increase the level of heat energy power recovery in the fractionation and compression of gas units and their complexes in the gas-chemical production by studying and analyzing the existing system of regenerative heat transfer, and scientific substantiation of methods for increasing of the heat recovery power, creating a method for calculating the theoretically substantiated and technically permissible capacity increase of the regenerative heat exchange, and the introduction of achievements in scientific-and-technical developments and training process. Methods of research: the fundamental methods of thermodynamics and heat transfer was used to determine the consumption of external energy in the chemical-technological processes and the amount of energy recovery; the grid diagrams method was used to create a project for the reconstruction of the heat exchanger system; the Microsoft Excel and MathCAD software and math packages was used to make calculations and create a calculation method; the "CAS-200" program was used to calculate the technological parameters of the heat-exchange equipment; the "HILECT" and "Pinch 2.02" software was used to calculate the potential value of heat recovery capacity and to construct energy and economic curve dependencies; the package of three-dimensional solid-state modeling AutoCAD was used for drawing the individual units of devices; production modeling was carried out using of specialized software "UniSim Design". Theoretical and practical results: the technological schemes with increased regenerative heat exchange capacity for the rectification of a wide fraction of light hydrocarbons with the production of propane-pentane, propane-hexane, butane and isobutane fractions are developed; the technological schemes with increased regenerative heat exchange capacity for the territorial complex of wide fraction of light hydrocarbons division units is made; the technological schemes with increased regenerative heat exchange capacity the with the integration of the heat pump for the independent processes of the wide fraction of light hydrocarbons division and the territorial complex of units for wide fraction of light hydrocarbons division are proposed; the method of engineering calculations of the power increasing of the process heat energy recovery in the current two-flow heat exchange system is developed. Scientific novelty: the dependencies of utility values consumed by the process and the required heat transfer surface area vs. the value of the minimum heat transfer motive power ΔTmin in the recuperative process system were determined for the first time by constructing the component curves of the wide fraction of light hydrocarbons rectifying process to produce propane-pentane, propane-hexane, butane and isobutane fractions; the optimum value of the minimum heat transfer motive power ΔTmin was discovered for the first time in the recuperative system of the process for which the optimal values of the external utilities were determined, and the simulation mathematical model of the heat energy recovery system was constructed; a method for determining and increasing the specific power of the process heat recovery at the wide fraction of light hydrocarbons rectification units with the production of propane-pentane, propane-hexane, butane and isobutane fractions by integration of the heat pump is proposed and developed; the problem of economically expedient increase of the power heat energy recovery in a two-flow heat transfer system with utility paths and three active heat exchangers and for any of their quantities was solved for the first time; the dependences of heat carrier temperatures and heat load on existing and additional heat exchangers, both on its heat transfer surface area, and on the heat transfer intensity, were determined for the first time; dependencies of discounted value and a simple payback period for the reconstruction of a two-flow heat transfer system from both the additional area of the heat transfer surface and the heat transfer intensity were determined for the first time; a method for calculating an economically feasible additional heat transfer surface in an operating two-flow system of heat exchange with utility paths in the form of a mathematical model was created for the first time. The degree of implementation: the results of the work were introduced into the educational process of the Department of Integrated Technologies, Processes and Apparatuses of the National Technical University "Kharkiv Polytechnic Institute", into the research work of the North Kazakhstan State University named after M. O. Auezov and at the design works of PEF "Optimenergo". Scope of application: chemical, petrochemical, gas refining, oil refining, energy and related industries.