Jet type LNG vaporization system utilizing geothermal energy

Abstract

The invention relates to a jet type LNG vaporization system utilizing geothermal energy. The jet type LNG vaporization system comprises a vaporizer and a ground heat exchanger. A vaporization tank is a main body of the vaporizer and is divided into a heat exchange chamber and a non-heat-exchange chamber. The non-heat-exchange chamber is divided into a liquid chamber and a steam chamber. The liquid chamber is provided with an LNG inlet, and the steam chamber is provided with an NG outlet. A plurality of heat exchange pipes are arranged in the heat exchange chamber. The inlet end of each heat exchange pipe communicates with the liquid chamber, and the outlet end of each heat exchange pipe communicates with the steam chamber. The ground heat exchanger is buried underground, an inlet of the ground heat exchanger communicates with the bottom of the heat exchange chamber through a pipeline, and an outlet of the ground heat exchanger is sequentially connected with a compressor, a temporary storage box and a steam nozzle through pipelines. The outlet end of the steam nozzle is arranged at the top in the heat exchange chamber and points at the heat exchange pipes, and the ground heat exchanger is filled with heat exchange media. According to the system, geothermal energy and electric energy are combined, energy saving and environment friendliness are achieved, heat transfer is achieved through phase changes of the heat exchange media, and the heat transfer efficiency is high.

Description

technical field [0001] The invention belongs to the field of LNG vaporization, and in particular relates to a jet-type LNG vaporization system utilizing geothermal energy. Background technique [0002] With the development of the global economy, the shortage of global oil resources and the increasingly serious environmental pollution problems have led to a sharp increase in the consumption of natural gas with good combustibility and low pollution. Natural gas is a gas at room temperature, which is not convenient for storage and long-distance transportation. Generally, it is first converted into -163°C cryogenic liquid LNG (liquefied natural gas, liquefied natural gas), and then stored and transported over long distances. But before using LNG, it is necessary to use a vaporization system to increase the temperature of LNG at about -163°C to NG (natural gas, natural gas) at about 5°C. [0003] At present, the vaporizers used for LNG vaporization mainly include the following t...

AI Technical Summary

Problems solved by technology

[0004] (1) Open-frame vaporizer, that is, LNG flows in the heat transfer tube of the device, and there is a seawater spraying device outside the tube to spray seawater on the heat transfer tube to realize the heat exchange between seawater and LNG; the device has a simple structure and a large heat transfer volume Large, direct use of seawater and LNG for heat exchange, but because LNG has a large temperature difference in sensible heat exchange during the heat exchange process, and releases a large amount of cooling, it is easy to cause seawater to freeze, so the stability of the vaporization efficiency of this device cannot be guaranteed

[0005] (2) A vaporizer with an intermediate heat transfer medium, that is, LNG exchanges heat with the intermediate heat transfer medium, and the intermediate heat transfer medium exchanges heat with seawater (or other heat sources). Since the intermediate heat transfer medium uses a medium with a low freezing point, it ensures The stable operation of the system; but there are two deficiencies as follows: First, because the intermediate heat transfer medium is vaporized, it is a natural rising process, and the rising process is slow, which reduces the heat exchange efficiency; second, because the condensate fails to fall in time, it hinders Direct heat transfer between gas and heat exchange tubes

[0006] (3) Shell-and-tube vaporizer. Although the vaporizer has a compact structure, due to the low heat exchange efficiency of the shell-and-tube type and the large flow rate of the heat source, it cannot guarantee the stable vaporization of LNG.

Images