Semi-closed type timing constant-volume thermodynamic circulation method and system of prime motor

Abstract

Provided is a method and system for a semi-closed timing constant volume thermodynamic cycle in a prime motor. The cycle thereof comprises 6 processes: a multi-stage compression interstage cooling process, a counter-flow heat exchange process, a timing constant volume combustion process, an adiabatic expansion process, a post-cooling process and a process of removing carbon dioxide and water, and is a thermodynamic cycle of heat-work conversion. The compression power consumption is reduced through the multi-stage compression interstage cooling process; the enthalpy of a working medium after the expansion is recovered through the counter-flow heat exchange process and participates in the thermodynamic cycle; the production of harmful pollutants of HC, CO, PM, NOx etc. is effectively inhibited through the timing constant volume combustion process; a sufficient expansion working is achieved through the adiabatic expansion process; the working medium is further cooled to environment temperature through the post-cooling process such that the expansion ratio of the adiabatic expansion process is improved; and carbon dioxide and water produced in the timing constant volume combustion process are removed through the process of removing carbon dioxide and water, wherein the remaining working medium continues to participate in the next thermodynamic cycle. A direction for designing a prime motor which is efficient and has a low pollutant discharge and a high performance for the future is provided.

Description

technical field [0001] The invention relates to a prime mover, in particular to a semi-closed timing and constant volume thermodynamic cycle method and system for the prime mover. Background technique [0002] Improving the efficiency of internal combustion engines and reducing emissions have an important positive effect on saving resources and protecting the environment. Through the improved cycle process and combustion organization, the efficiency of the prime mover can be improved and the emission of harmful pollutants can be reduced. At present, the thermodynamic cycles used in internal combustion engines mainly include the Diesel cycle (P-V diagram as shown in figure 1 shown), Otto cycle (P-V diagram as shown in figure 2 shown), Atkinson cycle (P-V diagram as image 3 shown), Miller cycle, Brayton cycle, etc. Among them, Diesel cycle, Otto cycle, Atkinson cycle, Miller cycle should be mainly used in traditional reciprocating piston internal combustion engines, while...

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Problems solved by technology

[0020] In order to solve the deficiencies in the thermodynamic cycle of common internal combustion engines, enable thermodynamic machinery to achieve clean and efficient constant volume combustion, improve thermal efficiency, and solve the problems of inconvenient work under water, etc., the invention provides a semi-closed timing constant The capacity thermodynamic cycle method and system, the cycle process includes six processes inherent in the process, respectively, multi-stage compression interstage cooling process, countercurrent heat exchange process, timing and constant volume combustion process, adiabatic expansion process, post-cooling process and carbon dioxide and Water removal process, some embodiments also include auxiliary processes, such as pressure regulation process and oxidant and fuel mixing process

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