Internal combustion engine smoke exhaust precooling and waste heat utilization integrated system

Abstract

The invention provides an internal combustion engine smoke exhaust precooling and waste heat utilization integrated system. The system comprises an internal combustion engine, a flue gas pre-cooling device, a waste heat recovery unit, a heat exchange unit and a hot water utilization unit. According to the system, the flue gas pre-cooling device is constructed, and is used for precooling on the flue gas temperature of an outlet of the internal combustion engine, so that a pipeline, a pipe fitting, a valve, a waste heat boiler and the like in the flue gas flow are made of ordinary materials, therequirements can be met, the engineering construction cost is reduced, and the arrangement difficulty of the flue gas pipeline is also simplified. Meanwhile, internal combustion engine cylinder sleeve water outlet water is adopted as a cooling medium for exhausting smoke of the internal combustion engine, the water after heat exchange and heating is supplied to a heat consumer, and is cooled after being used by the hot user and returned to an internal combustion engine cylinder sleeve water inlet to re-used for cooling of an internal combustion engine cylinder sleeve, so that utilization of flue gas heat is ensured while the smoke exhaust pre-cooling of the internal combustion engine is realized, and a large amount of energy loss is avoided.

Description

technical field [0001] The invention relates to the technical field of flue gas treatment of internal combustion engines, in particular to an integrated system for exhaust gas precooling and waste heat utilization of internal combustion engines. Background technique [0002] The internal combustion engine is a heat engine that directly converts the heat energy released into power by burning fuel inside the machine. As a power device, the internal combustion engine is widely used in industry, agriculture, ships and other fields. [0003] Due to the high temperature of the flue gas exhausted by the internal combustion engine, generally between 400°C and 500°C, and up to 600°C to 650°C, the exhaust temperature of the internal combustion engine is related to fuel characteristics (composition, calorific value, etc.), internal combustion engine performance, and operation ( The control of air-fuel ratio) is related, even if the design exhaust gas temperature is a certain value of ...

AI Technical Summary

Problems solved by technology

For internal combustion engines with high exhaust gas temperature, the material grades of the flue gas pipes and pipe accessories, flue gas valves, compensators and waste heat boilers must be improved, especially for the case where the flue gas temperature reaches 500°C or even higher, ordinary carbon Structural steel, steel plates for boilers and pressure vessels can no longer meet the flue gas temperature requirements, and only high-temperature resistant alloy steel can be used, and the use of alloy steel will inevitably lead to a significant increase in cost

In addition, the higher the flue gas temperature, the more difficult the layout and thermal compensation of the entire flue gas pipeline, especially for space-constrained situations

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