A system and method for comprehensive utilization of lng

Abstract

The invention discloses an LNG comprehensive utilization system, which comprises an LNG storage tank, a first heat exchanger, a second heat exchanger, an air-conditioning pipeline, an air supply pipeline and a coolant pipeline; a method for comprehensive utilization of LNG, which comprises The system is controlled separately according to the four situations of no cooling and no heating, cooling and no heating, extreme cooling, and heating and no cooling in the air-conditioning room. The LNG comprehensive utilization system and method proposed by the present invention can make full use of the cold energy of LNG, replace the refrigeration structure of the traditional gas compression air conditioner, and have simple structure, low equipment cost, and easy industrialized manufacturing, which realizes the reduction of production cost and Dual purpose of energy saving and emission reduction.

Description

technical field [0001] The invention relates to the field of natural gas energy saving, in particular to an LNG comprehensive utilization system and method. Background technique [0002] At present, the utilization of LNG by LNG vehicles is still only at the level of utilizing its bioenergy, but before the natural gas enters the engine for combustion, the LNG at minus 160 °C in the storage tank needs to be gasified into normal temperature natural gas (NG), which produces about 830kJ / kg of cold capacity. This part of the cooling capacity is often wasted directly during driving. [0003] In recent years, some devices or equipment for utilizing LNG cold energy have appeared one after another. The invention patent application with the application number "201310713374.3" discloses a cold recovery system for LNG buses. The recovery system includes a single-chip microcomputer, a temperature sensor, and a mode selection circuit, heat exchanger, intake valve, exhaust valve, outlet...

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Problems solved by technology

The device / system has made full use of the cold energy and bioenergy of LNG and has high utilization efficiency, which has certain technological progress; however, the device / system has a complex structure, involves a large number of devices or equipment, and is expensive to assemble to the vehicle. It also needs to occupy a large space; the device / system uses a large number of booster pumps / delivery pumps, heat exchangers and other equipment. The cold energy of LNG is seriously lost in the heat exchanger, and the energy provided for the pump is large. The energy of the used LNG is equal to the energy consumed by each equipment, or even less than that; although the cold energy of LNG is fully utilized, it is not cost-effective in terms of actual benefits and does not have the prospect of practical application

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