Method and equipment for realizing low-temperature thermal power generation by cryogenic technology

Abstract

Low-temperature thermal power generation is realized in a new circulating mode. Natural substances such as liquid air, liquid nitrogen, liquid argon (1) and the like which exist in the atmosphere are taken as refrigeration working substances; the liquid nitrogen and the liquid argon are taken as assistant cold sources (13); the working substances are conveyed by a low-temperature liquid pump (2) in a pressure boosting mode; the working substances are cooled and cold is recovered by a low-temperature heat exchanging device (7); an intermediately-cold working substance performs heat exchange (15 and 14) with a low-grade heat source to generate intermediate-and-high pressure gas; one part of gas working substance of which the enthalpy value is increased is inflated to do work to generate electricity (17); and electric energy is merged into a local power grid (18). The other part of working substance is inflated in the pressure boosting mode (19) to generate the cold; the working substance is cooled, condensed, mixed and recovered by a low-temperature heat exchanging device (9) and an ejector (8); the working substance is supercooled in a liquefying mode (5) and recycled; and parameter detection, control and the like are realized by a computer control system (21).

Description

a technical field [0001] This technology involves technical fields such as power generation, refrigeration, thermal power, environmental protection, machinery manufacturing and automation. Two background technology [0002] Low-temperature heat energy (low-grade heat energy, low-quality heat energy) refers to low-level heat energy with a temperature below 120°C, including solar energy, geothermal energy, surface hydrothermal energy, surface and building radiant heat energy, and industrial waste heat energy. The total amount is huge and renewable. sex. Taking industrial waste heat as an example, about 50% of the heat energy is discharged in the form of low-grade waste heat, especially in the form of low-temperature hot water (more than one-third of the thermal efficiency of thermal power plants is lost in the condenser and taken away by circulating cooling water, When the gas is isothermally compressed, the heat energy taken away by the cooling water is equivalent to the wor...

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Problems solved by technology

Utilizing solar pools, solar hot water boilers and heat pump technologies to improve the grade of low-temperature thermal energy, thereby increasing power generation efficiency, is also a new development direction for low-temperature thermal energy power generation, but it is limited by the stability of heat sources and the selection of refrigerants.

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