Increasing the efficiency of thermal energy use at the thermal technology section of ethylene production

RELEVANCE. The issues of efficient use of fuel and energy resources in the industrial sector of the Russian Federation have been topical for the last decades, which is confirmed by the issuance of various legislative acts and regulatory documents at the federal and regional levels. The structure of energy complexes of operating organic synthesis enterprises was formed in conditions of interconnection with external systems of energy resources supply in the period of their low internal prices. These factors have caused the low system energy efficiency of technological complexes at the present time and the need for a systematic approach to the prospective planning of energy development directions of operating enterprises. In accordance with the strategy of development and modernization of the fuel and energy complex of Russia, the directions of development of energy supply systems of organic synthesis enterprises are defined in the areas of resource conservation and creation of energy technological complexes based on efficient sources of electricity and heat supply under the conditions of improvement of the main technological processes. THE PURPOSE . The purpose of this work is to study the heat-consuming technological units of the ethylene production line for the efficient use of thermal energy. Determine the energy saving potential and develop measures to optimize heat consumption at the considered production site. METHODS. In this work we have studied the operation of feed water preparation unit, steam condensate pumping unit, pyrolysis gas (pyrogas) washing unit, dilution steam preparation unit of ethylene production pyrolysis section within the framework of energy inspection of the enterprise as a whole. As a result of the survey, heat losses in technological sections were assessed, material balance of technological flows was drawn up, and possible reserves of heat energy saving were determined. CONCLUSION. It is determined that the use of heat discharged to the feed water alkaline flushing unit for heating of partially clarified water supplied to the deaerator with the installation of an additional heat exchanger at the feed water preparation and condensate pumping section will save water steam with pressure of 3.5 kgf/cm 2 and recycled water. At the section of water washing of pyrolysis gas, heat energy saving can be achieved by increasing the heat exchange coefficient by removing hydrocarbons from the dilution steam condensate. For the dilution steam preparation section a scheme solution is proposed, aimed at using the energy potential of steam-condensate mixture of heating steam by introducing a steam ejector unit behind the heat exchanger. The offered scheme will allow to receive economic effect 6400 Gcal/year, that in monetary terms will make 5120 thousand rubles/year, and payback period 1,2 years.