Apparatus and method for preparing ordinary ice and ozone ice by using lng cold energy using two-stage heat exchange

Abstract

The invention relates to a device and method for making common ice and ozone ice through LNG cold energy in a two-stage heat exchange manner. The device and method for making the ozone ice aim at achieving the purposes of the low cost and high ice making efficiency. The device comprises an ozone ice making machine and a common ice making machine. The device is characterized in that the device further comprises an LNG storage tank, an LNG gasification heat exchanger and a NG temperature rising heat exchanger; the LNG storage tank is connected with a cold segment inlet of the LNG gasification heat exchanger, an outlet of the LNG gasification heat exchanger is connected with the NG temperature rising heat exchanger, and an outlet of the NG temperature rising heat exchanger is connected to a natural gas pipeline network; the LNG gasification heat exchanger and the ozone ice making machine are connected through a first-stage circulation loop; and the NG temperature rising heat exchanger and the common ice making machine are connected through a second-stage circulation loop. The method includes the following steps that refrigerants in the first-stage circulation loop absorbs LNG cold energy in the LNG gasification heat exchanger for liquidation, and the cold energy is released for making ozone ice. The device and method are low in cost and high in ice making efficiency.

Description

technical field [0001] The invention relates to a device and method for preparing ozone ice, in particular to a device and method for preparing common ice and ozone ice by using LNG cold energy using two-stage heat exchange. Background technique [0002] The vaporization temperature of LNG (Liquefied Natural Gas) under normal pressure is -162°C. During the gasification process, it absorbs 502.1kJ / kg of latent heat of vaporization, and then changes from -162°C to zero under normal pressure. ℃ will also absorb 334.7kJ / kg of heat. Because LNG can release a large amount of cold energy and has an extremely low temperature of -162°C, LNG is a very high-quality low-temperature cold source. [0003] Ozone (O 3 ) is a strong oxidant that can disinfect, sterilize and deodorize, and does not produce harmful residues except for some oxygen. It has great prospects in the field of food processing, storage and transportation, especially in the field of seafood preservation. However, the...

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Problems solved by technology

[0005] In summary, there is no ozone ice preparation device and method with reasonable structural design, simple process, low cost, and high ice-making efficiency at present.

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