Zero-cold-source natural gas excess pressure recovery and efficient utilization system

Abstract

The invention discloses a zero-cold-source natural gas excess pressure recovery and efficient utilization system. An output shaft of an expansion machine (1) is connected with a gearbox (2), a transmission shaft of the gearbox (2) is connected with rotary mechanical equipment (3), the expansion machine (1) is connected with a heat exchanger A (4), the heat exchanger A (4) is connected with a cold storage tank (5), the cold storage tank (5) is connected with a variable frequency pump (6), the variable frequency pump (6) is connected with a heat exchanger B (9), and the heat exchanger B (9) is connected with the heat exchanger A (4). The heat exchanger B (9) is connected with a system lubricating oil station (11), the heat exchanger B (9) is sequentially connected with the rotary mechanical equipment (3), the gearbox (2) and the expansion machine (1), and the expansion machine (1), the gearbox (2) and the rotary mechanical equipment (3) are sequentially connected and then connected with the system lubricating oil station (11). Pressure energy of natural gas can be converted into mechanical energy, cold energy of the natural gas can be recycled, and meanwhile limitation of geographic positions is avoided.

Description

technical field [0001] The invention belongs to the technical field of mechanical equipment, and specifically relates to a zero-cold source natural gas residual pressure recovery and high-efficiency utilization system. Background technique [0002] Natural gas is a relatively clean energy. After natural gas is exploited, it is transported through pipelines in high-pressure form, and then adjusted step by step through various pressure regulating stations, and finally supplied to users. During the pressure regulating process of the pressure regulating station, the natural gas pressure can be directly lost and wasted through the pressure regulating station. By replacing the pressure regulating station with an expander, the pressure energy of natural gas can drive the rotation of mechanical equipment and convert it into mechanical energy, and the mechanical energy can be further converted into other forms of energy, such as electrical energy, heat energy, etc. When using an e...

AI Technical Summary

Problems solved by technology

When using an expander instead of a pressure regulating station to decompress, it is necessary to configure a lubricating oil station for the expander, gear box, mechanical rotating device, etc., and a corresponding lubricating oil cooling system needs to be configured to prevent the temperature of the lubricating oil from being too high. High, to configure the cooling system separately, it is necessary to configure the cooling source for the cooling system, which will not only increase the manufacturing cost of the system, but also be limited by the geographical environment

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