Comprehensive system and method for ship LNG power and cold energy preservation

Abstract

The invention relates to a comprehensive system and method for ship LNG power and cold energy preservation. The system comprises an LNG storage tank, a cold energy recovery heat exchanger, a natural gas heating heat exchanger and a buffer tank, wherein the buffer tank is connected with an engine through a pipeline, the cold energy recovery heat exchanger is connected with a cold storage tank and arefrigerant medium heat exchanger through a three-way adjusting valve and then connected with a circulating pump to return to the cold energy recovery heat exchanger to form a cold energy recovery circulating system, the cold storage tank, the driving pump, the refrigerant medium heat exchanger and multiple cold energy utilization pipelines connected in parallel are sequentially connected. Finally, the liquid returns to the cold storage tank to form a cold energy utilization circulating system, by means of adjustment of the three-way adjusting valve, the cold supply response speed of the system can be guaranteed, redundant cold energy can be stored in the cold storage tank, cold supply stability is effectively kept, the comprehensive utilization system is short in response time and low inimplementation cost, various emergencies can be effectively coped with by means of backup refrigeration measures, and the comprehensive utilization system has very wide applicability.

Description

technical field [0001] The invention relates to the technical field of LNG cold energy utilization of refrigerated ships, in particular to a comprehensive system and method for ship LNG power and cold energy preservation. Background technique [0002] At present, with the increasingly stringent global and domestic control of harmful gas emissions from ships, it has gradually become a trend for ships to use pure LNG power or LNG / fuel oil dual fuel power, but often LNG is converted into normal temperature natural gas that can be used for normal combustion of ship engines At this time, the released cold energy is wasted and not fully utilized. Although some methods of using LNG cold energy have been proposed, these methods often have the following problems: [0003] 1. More theoretical analysis, lack of practical application considerations, and even less consideration under the constraints of actual equipment boundary conditions, the possibility of practical application on shi...

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Problems solved by technology

[0003] 1. More theoretical analysis, lack of practical application considerations, and even less consideration under the constraints of actual equipment boundary conditions, the possibility of practical application on ships is not high

[0004] 2. These methods often cover a variety of possible ways to utilize LNG cold energy, greedy for everything

Although there are many methods, the effect and degree of each goal are often limited, and there is no in-depth design for a specific purpose, so as to well solve a certain special demand for ship applications

[0005] 3. Although the existing methods may meet the requirements of realization in principle, due to the lack of practical application considerations, even if they can be applied on actual ships, they still face high cost, complex structure, low efficiency, and limited space for ships. And many disadvantages such as heavy burden caused by weight

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