Method and system for using waste heat to supply hydrogen to hcng engine power system

Abstract

The invention belongs to the field of HCNG engine application, and particularly relates to a method and system capable of using waste heat for efficiently and precisely supplying hydrogen to an HCNG engine power system. The system comprises a medium-high temperature solid metal hydride hydrogen storage reactor, a low-temperature solid metal hydride hydrogen storage reactor, a fuel mixing cavity, and an SI engine. The medium-high temperature solid metal hydride hydrogen storage reactor and the low-temperature solid metal hydride hydrogen storage reactor can achieve efficient releasing of hydrogen through waste heat of the HCNG engine, meanwhile, a dual-hydrogen source can be precisely regulated to provide needed mixed hydrogen for a natural gas internal combustion engine, and stable hydrogen supply and mixed hydrogen combustion are achieved. According to the system, the waste heat of the HCNG engine is used for driving the solid-state dual-hydrogen source system to achieve efficient, precise and stable hydrogen supply, the comprehensive heat efficiency of the natural gas engine can be improved, the pollutant emission amount of the natural gas engine can be effectively reduced, and the clean and efficient use of the natural gas can be achieved.

Description

technical field [0001] The invention designs a method and system for supplying hydrogen to an HCNG engine power system by using waste heat, especially a hydrogen supply technology in which medium-high and low-temperature solid metal hydride hydrogen storage reactors are used as dual hydrogen sources, and belongs to the field of engine waste heat utilization. Background technique [0002] Compared with coal and oil, natural gas is regarded as a clean energy among traditional fossil fuels due to its higher hydrogen-to-carbon ratio, high combustion calorific value, cleanness and environmental protection, and cheap price. However, natural gas accounts for only 6.4% of my country's primary energy consumption, far below the world average of 23.7%. [0003] Lean-burn natural gas engines have good economy and low emissions, meeting the requirements of the current National IV regulations, but it is very difficult to further reduce NOx emissions and improve overall thermal efficiency....

AI Technical Summary

Problems solved by technology

At present, the hydrogen supply method of SI engine is mainly based on high-pressure hydrogen source. Although the operation is simple, its hydrogen storage volume density is small, resulting in the required hydrogen source system volume is too large, and the cost is high, and the safety performance cannot be guaranteed.

In addition, the waste heat of the engine is often discharged with the exhaust gas, resulting in energy waste

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