Three-layer coupling power generation method by using LNG cold energy and temperature difference double loops and fuel gas

Abstract

The invention discloses a three-layer coupling power generation method by using LNG cold energy and temperature difference double loops and fuel gas. Conventional cold energy power generation utilizescryogenic liquefied gas to exchange heat with normal-temperature seawater, a large amount of low-temperature gas is generated in a short time, a turbine of a steam turbine is directly blown through amain gas pipeline to enable the turbine to rotate to generate power, and a large amount of cold energy is wasted. The method involves an LNG cryogenic liquid tank (1), the LNG cryogenic liquid tank is connected with a cryogenic liquid CH4 pipeline (2), the cryogenic liquid CH4 pipeline is connected with a high-pressure low-temperature CH4 buffer tank (5), the high-pressure low-temperature CH4 buffer tank is connected with a normal-pressure low-temperature CH4 buffer tank (8) and a compressed CNG tank (7) through a low-temperature methane steam engine (6), the normal-pressure low-temperature CH4 buffer tank is connected with a low-temperature negative electrode thermoelectric power generation piece A (9) and a normal-pressure high-temperature CH4 buffer tank (13), and the normal-pressure high-temperature CH4 buffer tank and a normal-pressure high-temperature O2 buffer tank (14) are connected with a gas furnace (10) through gas nozzles. The method is used for three-layer coupling powergeneration by using the LNG cold energy and temperature difference double loops and the fuel gas.

Description

Technical field: [0001] The invention relates to a power generation method using LNG cold energy, temperature difference double circuits and gas three-layer coupling. Background technique: [0002] The conventional way of LNG cold energy power generation is to use the cryogenic liquefied gas at -161.5°C to exchange heat with seawater at normal temperature. The turbine spins to generate electricity, but this method wastes a lot of cold energy. The waste of cold energy is mainly divided into two steps. The first is the heat exchange process with seawater. The cold seawater after heat exchange is directly discharged into the sea, resulting in waste of cold energy. In the second step, the low-temperature natural gas is directly used as a combustible material after rotating the turbine to generate electricity, resulting in "low-temperature cold energy for high-temperature use". Fuel is wasted, and there is no low-temperature additional product generated in the intermediate proc...

AI Technical Summary

Problems solved by technology

[0002] The conventional way of LNG cold energy power generation is to use the cryogenic liquefied gas at -161.5°C to exchange heat with seawater at normal temperature. The turbine rotates to generate electricity, but this method wastes a lot of cold energy

The waste of cold energy is mainly divided into two steps. The first is the heat exchange process with seawater. The cold seawater after heat exchange is directly discharged into the sea, resulting in waste of cold energy.

In the second step, the low-temperature natural gas is directly used as combustibles after the turbine is rotated to generate electricity, resulting in "low-temperature cold energy for high-temperature use". Fuel is wasted, and there is no low-temperature additional product generated in the intermediate process; at the same time, the conventional thermoelectric power generation form is a single-loop thermoelectric power generation mode with a high-temperature positive electrode and a low-temperature negative electrode. This mode makes the single-loop current smaller and the power generation efficiency is lower.

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