Pump-free self-compression organic Rankine cycle engine

Abstract

The invention discloses a pump-free self-compression organic Rankine cycle engine, and belongs to the field of medium-low-grade energy utilization. A main piston and an auxiliary piston are installedin a non-isodiametric cylindrical air cylinder. The main piston reciprocates between a first upper dead center and a first lower dead center, and an exhaust leading-out point is arranged in the middle; the auxiliary piston is of a non-isodiametric T-shaped structure; the small-diameter part of the auxiliary piston is matched with the small-diameter part of the bottom of the air cylinder; the auxiliary piston reciprocates between a second upper dead center and a second lower dead center, and a heater is installed at the second upper dead center and the second lower dead center. The main pistonis connected with a connecting rod and a crankshaft to convert reciprocating motion into rotating motion. The lower end surface of the auxiliary piston is connected with the bottom of the air cylinderthrough a spring; a through hole is formed in a center shaft of the auxiliary piston; compression, heat absorption and expansion acting of a working medium in the air cylinder are achieved through the main piston, the auxiliary piston and movement, and exhaust gas enters a condenser to be condensed and recirculated.

Description

technical field [0001] The invention relates to a pumpless self-compressing organic Rankine cycle engine, which belongs to the field of medium and low-grade energy utilization. Background technique [0002] The Organic Rankine cycle system has significant advantages in recycling various low-grade heat energy such as industrial waste heat and solar energy. The existing research mainly focuses on using the energy generated by the system for power generation. In the organic Rankine cycle system, the expander is the power output part, and the working medium pump will consume part of the shaft work of the expander. Since the critical temperature of the organic working medium is much lower than that of water, compared with the traditional steam power cycle, The theoretical pumping work of the organic Rankine cycle is much larger, but in the actual organic Rankine cycle system, the energy consumed by the working fluid pump is greater than the theoretical pumping work, so the pumpin...

AI Technical Summary

Problems solved by technology

In the organic Rankine cycle system, the expander is the power output part, and the working medium pump will consume part of the shaft work of the expander. Since the critical temperature of the organic working medium is much lower than that of water, compared with the traditional steam power cycle, The theoretical pumping work of the organic Rankine cycle is much larger, but in the actual organic Rankine cycle system, the energy consumed by the working fluid pump is greater than the theoretical pumping work, so the pumping work of the organic Rankine cycle cannot be ignored, in some may also have an important impact on the organic Rankine cycle

Due to the high pressure of the working fluid pump, the efficiency of the working fluid pump is too low, especially in the small-scale organic Rankine cycle, there is a large irreversible loss in the working fluid pump, and the power consumption is large, which affects the organic Rankine cycle. Performance improvements for loops

In the current literature, the pumpless organic Rankine cycle either uses a large height difference to provide cycle power, or cannot work continuously

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