UDC 697.921.452
DOI 10.35776/VST.2026.08.07

Gataullina Alina, Sigaeva Vera

Improving the energy efficiency of the blowing ventilation system by utilizing the heat of the compressor station of a hydro cracker

Summary

Hydrocracker compressor equipment generates up to 35–40% of the low-grade heat consumed; however, irretrievably lost through the cooling systems. The objective of this study was to analyze the efficiency of utilizing this heat for the needs of the blowing ventilation system of an oil refinery production building. The heat balance was calculated for the compressor station, and the available thermal capacity (560 kW) was determined based on the equipment specifications. A hydraulic circuit with an intermediate coolant (water, 70/50°C temperature chart) was proposed. For a facility (in the climatic conditions of the central region of Russia) with three compressors (one for the circulating gas, two for the makeup, and one for the backup) and a 60,000 m3/h air handling unit, the recovery was found to cover 63.3% of the heat load during extreme cold periods and completely replace the external heat source at temperatures above –3.1°C. The system operates only during the heating season (5,136 hours/year). The annual thermal energy savings amount to 1,872 Gcal, resulting in savings of over 5.05 million rubles with a capital investment payback period of approximately 2.5 years. The proposed solution is economically feasible and can be recommended for the application at oil refining facilities.

Key words

energy efficiency , air-blowing (compressor) station , pay-back period , heat recovery , hydrocracker , blowing ventilation , heat balance , low-potential heat , cooling system , intermediate coolant

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UDC 628.24

Zhmakov G. N.

Designing pressure and vacuum public sewers

Summary

In Russia until recently only gravity sewers have been used for public sewers. With advent of sparsely populated territories of low-rise development the gravity sewers become unreliable and require high operational expenditures; therefore, pressure and vacuum public sewers are used with increasing frequencies. Because of the high flow rate and turbulence the threat of blockage of these pipelines is low. In vacuum sewers wastewater is aerated; therefore no corrosion occurs. Comparing to the expenditures for a free slope sewer the construction the costs saving in case of a vacuum sewer amounts up to 50%. Pressure sewer includes receiving tanks, mini sewage pumping stations, air-blowing (compressor) stations, pressure pipelines with valves and fittings. Vacuum sewer includes curtilage chambers, collecting pipelines and a vacuum station combined with a sewage pumping station. The formulas for pump capacity calculations are presented. The examples of lay out solutions are given.

Key words

treatment facilities , pumping station , sewerage system , vacuum station , air-blowing (compressor) station , suction valve , water seal