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Method and device for cooling air-conditioning circulating water by using cold energy of liquefied natural gas

A liquefied natural gas and air-conditioning cycle technology, applied in household refrigeration devices, air-conditioning systems, applications, etc., can solve the problem of wasting LNG cooling capacity and other problems, and achieve the effects of high cooling energy utilization, high stability and convenient operation.

Active Publication Date: 2012-07-18
SOUTH CHINA UNIV OF TECH +1
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Problems solved by technology

[0006] The purpose of the present invention is to overcome the shortcomings of the prior art, and solve the current problem of direct gasification of LNG for gas supply and waste of LNG cooling capacity

Method used

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  • Method and device for cooling air-conditioning circulating water by using cold energy of liquefied natural gas

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Embodiment approach

[0035] There are two ways to implement the cooling capacity source of the ice storage pool in the present invention. One is that when the LNG volume is sufficient, the cooling volume of the ice storage pool is provided by the cooling volume of the LNG; the other is that when the LNG volume is insufficient, the electricity The compression refrigeration device is jointly provided by LNG cold energy and electric energy.

[0036] The working process of the device of the present invention: adjust the first regulating valve 2, adjust the flow of LNG entering the LNG heat exchanger to be 3000kg / h; adjust the second regulating valve 8, adjust the flow of ethanol solution entering the LNG heat exchanger to be 21.5t / h After the LNG exchanges heat with ethanol in the LNG heat exchanger 4, it enters the LNG air vaporizer 5, enters the urban pipe network after gasification, and the refrigerant exchanges heat with the water in the ice storage tank, and the water condenses into ice; The etha...

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Abstract

The invention discloses a method and a device for cooling air-conditioning circulating water by using cold energy of liquefied natural gas. The method includes the steps: (1) exchanging heat of the liquefied natural gas with coolants, and then vaporizing the liquefied natural gas into 0.3-0.5MPa natural gas at the temperature ranging from 14 DEG C to 16 DEG C to enter a natural gas pipe network; (2) exchanging heat of the coolants after heat exchange with water in an ice storage tank, condensing the water in the ice storage tank into ice, increasing the temperature of the coolants, and returning the coolants to a coolant storage tank for recycle; and (3) leading the air-conditioning circulating water to enter an air conditioner after cooling the air-conditioning circulating water with the ice in the ice storage tank. The method is used for recycling the cold energy of 3000kg / h LNG (liquefied natural gas) at the temperature of -162 DEG C, 4.5t / h water can be condensed into ice, the ice provides about 700kW cold energy for the air conditioner with cold water per hour, and the economic benefit of about 2.45 million Yuan can be obtained every year. The method is simple in process, convenient in control, high in operational flexibility, high in cold energy utilization efficiency and low in energy consumption, and has wide industrial popularization and application prospect.

Description

technical field [0001] The invention discloses a method and a device for cooling circulating water of an air conditioner by utilizing cold energy of liquefied natural gas. Background technique [0002] The rapid development of my country's LNG industry and the relative backwardness of natural gas pipeline network infrastructure have made LNG satellite gasification stations bloom everywhere. The LNG satellite station is a small LNG receiving and gasification station. Through secondary transportation, LNG is imported to towns or satellite cities far away from LNG factories in central cities, and after odorization, it is directly sent to the urban pipeline network for civil, commercial and industrial use. It is the secondary gas source of natural gas. origin site. It has the characteristics of high storage efficiency, small land occupation, low investment, short construction period, flexible construction mode, and multi-source gas supply. It has a wide range of applications a...

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Application Information

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IPC IPC(8): F25D3/10F24F5/00F24F11/02
Inventor 徐文东陈敏刘建辉柳珉敏陈秋雄陈运文陆涵杜琳琳
Owner SOUTH CHINA UNIV OF TECH
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