A Cascade Utilization System of Waste Heat of Internal Combustion Engine for Power Generation

Abstract

The invention discloses an afterheat cascaded utilization system of an electricity generating internal combustion engine. The afterheat cascaded utilization system comprises at least one electricity generating internal combustion engine, wherein smoke gas comes out from a piston cylinder of the internal combustion engine and is then exhausted through a turbocharger, the exhausted smoke gas sequentially passes through a first afterheat boiler, a smoke gas-coal drying heat exchange device and a second afterheat boiler, the smoke gas dries brown coal used for a coal-fired boiler in the smoke gas-coal drying heat exchange device, and water generated after the cooling of smoke gas passing through the second afterheat boiler is conveyed to a water storage device. Electricity generated by the electricity generating internal combustion engine through an electricity generator is accessed into an electric network or is used as a starting power supply of a coal-fired electric station black starting, steam generated by a coal-fired electric station boiler enters a steam turbine, the steam turbine is pushed to apply work, and corresponding generators are driven to generate electricity. The afterheat cascaded utilization system has the advantages that the cascaded utilization of discharged smoke afterheat of the internal combustion engine is realized, and the energy waste is reduced.

Description

technical field [0001] The invention relates to the technical field of energy and power, in particular to a cascade utilization system for waste heat of an internal combustion engine for power generation. Background technique [0002] The heat discharge of the existing power generation internal combustion engine has the following technical problems: [0003] 1. The exhaust gas temperature of the internal combustion engine for power generation is 300 to 500°C. The temperature is different under different models and different working conditions. The internal combustion engine for power generation directly discharges the flue gas to the atmosphere, causing serious energy waste. [0004] 2. High-moisture coal, such as lignite, generally has a moisture content greater than 20% or even higher. Excessive moisture content in coal will reduce the efficiency of coal combustion heat utilization. In the existing technology, the application number: 201120083406.2 discloses a system for...

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Problems solved by technology

Excessive moisture content in coal will reduce the efficiency of coal combustion heat utilization

In the existing technology, the application number: 201120083406.2 discloses a system for drying lignite by using boiler flue gas waste heat, and the application number: 201420180737.1 discloses a system for drying lignite by boiler flue gas waste heat in a thermal power plant, which adopts the furnace smoke drying of the boiler lignite technology, but the smoke extraction changes the flow field and the balance of the flue air system in the coal-fired boiler, making the design and operation control of the coal-fired boiler more complicated, and the smoke from the coal-fired boiler contains a large amount of Dust, the recirculation of the extracted fume will increase the dust concentration of the fume, which will increase the wear and tear of the coal-fired boiler

[0005] 3. High-moisture coal is directly fed into the furnace for combustion, which not only reduces the efficiency of coal combustion heat utilization, but also wastes the moisture in the coal

Start-up boilers generally have low power and low efficiency. Therefore, when large-scale coal-fired power plants are in normal operation, the start-up boilers are generally idle, resulting in a waste of resources

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