A low-quality waste heat recovery device for an engine

Abstract

The invention discloses a low-quality engine waste heat recovery device. The low-quality engine waste heat recovery device comprises an engine, an exhaust driven supercharger, a coolant, a heat exchanger, a blade-free turbine, a generator, a condenser, a water pump, a flow control valve, a coolant circulation line, a controller, a controllable fan, a compressor, a supercharger turbine, a control line and the like, wherein the blade-free turbine comprises a turbine disk, a turbine shaft, a volute, a gasket, a gland nut, a pedestal bearing and the like. The low-quality engine waste heat recovery device can realize joint recovery and use of coolant waste heat and exhaust waste heat, adopts the blade-free turbine to recover the coolant waste heat, can solve the problem that the exhaust cannot be expanded sufficiently due to the small expansion ratio of the turbine of the conventional waste heat recovery device and improves the engine waste heat recovery efficiency. Meanwhile, the blade-free turbine can realize energy recovery under the small-flow condition and is simple to manufacture, low in maintenance cost and high in reliability.

Description

technical field [0001] The invention relates to a low-quality engine waste heat recovery device, in particular to a bladeless turbine recovery engine waste heat device, which belongs to the technical field of engine waste heat recovery. Background technique [0002] About 30% of the fuel combustion heat of the engine is discharged into the atmosphere in the form of exhaust gas, 30% is lost in friction, cooling and heat dissipation, and only about 40% is output as effective work. It can be seen that the energy utilization rate of the engine is not high. Therefore, how to maximize the efficiency of engine energy utilization is the focus of power machinery and related disciplines. In recent years, engine waste heat recovery has become a research hotspot to improve energy utilization efficiency, and the content is extensive. In terms of waste heat recovery and utilization of waste gas, there are mainly thermoelectric power generation, heating, cooling, use of waste heat of was...

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Problems solved by technology

[0006] The technical problem to be solved by the present invention is to jointly recover the waste heat of the engine exhaust gas and the waste heat of the coolant, that is, to provide a low-quality waste heat recovery device for the engine, which can not only realize the joint recovery and utilization of the waste heat of the engine coolant and the waste heat of the exhaust gas, but also It can solve the problem that the exhaust gas cannot be fully expanded due to the small turbine expansion ratio in the existing waste heat recovery device, and the energy recovery rate is low

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