Waste heat comprehensive energy recovery device for diesel engine

Abstract

The invention provides a waste heat comprehensive energy recovery device for a diesel engine, and belongs to the technical field of energy recovery. When the waste heat comprehensive energy recovery device is used, water firstly absorbs heat through a pressurized air heat exchanger and then enters a flue gas heat exchanger to further absorb flue gas heat, generated steam or a generated steam-watermixture is atomized through a spray head, and then enters an evaporator to be mixed with high-temperature flue gas from a smoke exhaust main pipe of the diesel engine to be quickly vaporized into water vapor, on one hand, a mixture of the flue gas and the water vapor drives a waste gas turbocharger to provide supercharged air for the diesel engine, and on the other hand, the mixture drives a power turbine is driven to work; and energy recovered by the power turbine is finally fed back to an output shaft of the diesel engine through a gear transmission device, so that the energy is effectivelyutilized. The system can recycle supercharged air, lubricating oil and exhausted flue gas waste heat energy of the diesel engine to the maximum extent, the exhausted flue gas temperature of the diesel engine is effectively reduced, the proper environment temperature is provided for tail gas desulfurization of the diesel engine, the external output power of the diesel engine is increased, and thefuel consumption rate of the diesel engine is reduced.

Description

technical field [0001] The invention belongs to the technical field of energy recovery and utilization, and in particular relates to a waste heat comprehensive energy recovery device for diesel engines. Background technique [0002] The thermal efficiency of a diesel engine is generally less than 50%, and most of the remaining energy is discharged into the natural environment in the form of heat. The waste heat resources are abundant, especially for large and medium-sized diesel engines, whose stand-alone waste heat power is at the megawatt level, and the maximum stand-alone power can reach 80-100 MW. Generally, multiple large diesel engines are operated in parallel, such as land diesel engine power station system, marine diesel engine power system and power station system, offshore platform power station system, etc., as few as 2-3 units are operated in parallel, and as many as dozens of units are connected in parallel Running, the residual heat energy is very large. Ther...

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Problems solved by technology

[0004] However, the above four waste heat energy recovery methods each have their own disadvantages.

The first type needs to invest in waste heat boilers. Waste heat boilers are generally large in size and are used for heating, cooling and seawater desalination. Their economic efficiency is limited by factors such as seasons and fresh water demand, and they often cannot make full use of waste heat resources.

The cycle power generation efficiency of the second organic Rankine cycle system is generally less than 10%. After taking into account the power consumption of its cooling water pump and auxiliary electrical equipment, its power generation efficiency is greatly reduced; in addition, the system is complex and requires the use of high-speed motors 1. Select special power transformation equipment and system control devices, and the organic working medium is expensive, so the investment is high, the operation and maintenance costs are high, and there are still many technical bottlenecks in the sealing and control of the system that need to be broken through; third, turbocharging Although the system is simple, all the energy recovered by the former is used by the diesel engine and has been included in the working efficiency of the diesel engine, so no further comments on this equipment

If the generated electric energy needs to be connected to the grid, the power transformation system is complex and the investment is high

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