Gimazetdinov R.R., Malozemov A.A., Kukis V.S. Diesel-generator plant with the recovery of waste heat of the piston engine

Abstract

The subject of the investigation was the waste heat recovery system of a small-scale heat electropower station that can be used as stationary and primary, reserve or additional source of electrical and thermal energy. The object of the investigation was the waste heat recovery system of the diesel engine D 180 and the small-scale heat electropower station on the basis of the diesel generator plant DGU-100C produced by JSC «ChTZ». The aim of the investigation was an experimental estimation of the efficient use of the diesel engine’s waste heat recovery system. The recovery system was consisted of an original heat exchanger for the recovery of the waste heat of the diesel engine’s cooling system, the waste heat of the lubricating system, the centers of which is made in a common housing, and the heat exchanger for the recovery of the exhaust gases waste heat from the diesel engine (pre-heater boiler PZD-600). The article presents the small-scale heat electropower station’s arrangement with the waste heat recovery system, the original heat exchanger arrangement and a scheme of the small-scale heat electropower station with the waste heat recovery system. The principle of operation of the proposed system is described. In comparison with the known constructions, in the proposed cogeneration power plant there is no need to separately regulate the temperature of the cooling liquid and the lubricating oil at the inlet to the piston internal combustion engine and the necessity to use an additional liquid-oil heat exchanger or oil cooler in the operation of the cogeneration plant without thermal load. Collectively, it was ensured a reduction of the complexity, material consumption and overall dimensions of the recovery system and the cogeneration power plant in general. The absolute economic effect from the using of the waste heat recovery system is 240…300 thousand rubles for the engine life, specific - 22…28 rubles/h. The payback period of the waste heat recovery system is less than a year. The obtained results convincingly indicate the economic feasibility of implementing the proposed system of waste heat recovery of the diesel engine D 180 of a small-scale heat electropower station based on the DGU-100S.