Method and device for making ice by using liquefied natural gas cold energy

A technology for liquefied natural gas and cold energy, applied in ice making, ice making, application, etc., can solve the problems of insufficient utilization of LNG cold energy, low energy utilization efficiency, complex equipment and process, etc., to achieve easy operation and maintenance, high efficiency The effect of energy saving and cooling energy utilization rate and convenient operation

Inactive Publication Date: 2012-01-25
SOUTH CHINA UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the utilization of LNG cold energy is insufficient, and there is a lot of waste of low-temperature nitrogen
From the above analysis, it can be seen that the cold energy of LNG is used in the air separation process, the equipment and process are complicated, and the energy utilization efficiency is low
[0005] The use of LNG cold energy to generate electricity is rare in the world, and because the temperature of LNG is -162°C, the quality of cold energy is high, and it is directly used to drive power generation devices such as turbines, and its efficiency is low, and its energy utilization efficiency is only about 10%

Method used

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  • Method and device for making ice by using liquefied natural gas cold energy

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Embodiment 1

[0027] A method for using liquefied natural gas cold energy to make ice, comprising the following steps:

[0028] (1) After heat exchange between liquefied natural gas at 0.3-0.5MPa, -162°C and ethylene glycol aqueous solution with a concentration of 50%wt at 1°C, the temperature is 15°C, the pressure is 0.3-0.5MPa, and then gasified to 0.3-0.5 Natural gas at MPa and 25°C enters the natural gas pipeline network;

[0029] (2) After heat exchange, the temperature of the ethylene glycol aqueous solution drops to -35°C, pressurize to 0.3-0.5MPa, exchange heat with water, the water condenses into ice, and scrape off the ice;

[0030] (3) The ethylene glycol aqueous solution after heat exchange with water is returned to the ethylene glycol normal temperature storage tank, and the ethylene glycol aqueous solution in the normal temperature storage tank is raised to 1°C for recycling.

[0031] The LNG storage tank 1 is connected to the cold flow inlet of the LNG vaporizer 4 through an...

Embodiment 2

[0045] The low-temperature and low-pressure LNG coming out from the LNG storage tank 1 is pressurized to 0.3-0.5MPa through the first centrifugal pump 3, and the LNG after pressurization flows into the LNG vaporizer 4, and the ethyl alcohol after the pressurization from the normal temperature storage tank 10 of ethylene glycol aqueous solution The aqueous glycol solution exchanges heat in the vaporizer 4 . Referring to the pressure sensor 15 and temperature sensor 14 of the LNG pipeline, adjust the flow rate of LNG to ensure that the flow rate is 0.15kg / s, the flow rate of ethylene glycol solution is 1kg / s, the LNG outlet temperature is 17°C, and the pressure is 0.3-0.5MPa , regasified into natural gas at 0.3-0.5MPa and 25°C and enters the natural gas pipeline network, the cooled ethylene glycol aqueous solution flows into the ethylene glycol aqueous solution cold storage tank 5, and passes through the second centrifugal pump 7 with a flow rate of 1kg / s. The pressure rises to ...

Embodiment 3

[0047] The low-temperature and low-pressure LNG coming out from the LNG storage tank 1 is pressurized to 0.3-0.4MPa through the first centrifugal pump 3, and the LNG after pressurization flows into the LNG vaporizer 4, and the ethylene glycol after the normal temperature storage tank 10 pressurization from the aqueous solution of ethylene glycol. The aqueous glycol solution exchanges heat in the vaporizer 4 . Referring to the pressure sensor 15 and temperature sensor 14 of the LNG pipeline, adjust the LNG flow rate to ensure that the flow rate is 0.1kg / s, the flow rate of the ethylene glycol aqueous solution is 0.7 kg / s, the LNG outlet temperature is 20°C, and the pressure is 0.3-0.5MPa , regasified into natural gas at 0.3-0.5MPa and 25°C and then enters the natural gas pipeline network, the cooled ethylene glycol aqueous solution flows into the cold storage tank 5, passes through the second centrifugal pump 7, the flow rate is 0.7Kg / s, and the pressure rises To 0.3-0.5MPa, en...

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Abstract

The invention discloses a method and device for making ice by using liquefied natural gas cold energy. The method comprises the following steps that: (1) the liquefied natural gas with pressure of 0.3-0.5 MPa and temperature of -162 DEG C is kept at a temperature of 15-20 DEG C and a pressure of 0.3-0.5 MPa after exchanging heat with glycol aqueous solution, and then is gasified into the natural gas with pressure of 0.3-0.5 MPa and temperature of 25 DEG C; and the natural gas with pressure of 0.3-0.5 MPa and temperature of 25 DEG C enters a natural gas pipe network; (2) the glycol aqueous solution after heat exchange is cooled to -34 to -36 DEG C and supercharged to 0.3-0.5 MPa; and then the glycol aqueous solution exchanges heat with water; the water is condensed into ice; and the ice is scraped off; and (3) the glycol aqueous solution after exchanging heat with water returns to a room temperature glycol storage tank; the glycol aqueous solution in the room temperature storage tank is heated to 1-2 DEG C to be recycled. The method for making the ice by using the liquefied natural gas cold energy, disclosed by the invention, has the advantages of high LNG (Liquefied Natural Gas) cold energy utilization rate, no need of additional refrigeration power source during making ice and energy consumption conservation.

Description

technical field [0001] The invention discloses a method and a device for using LNG cold energy to make ice. Background technique [0002] LNG (liquid natural gas) is a low-temperature liquid mixture formed by natural gas deacidification, dehydration, and freezing and liquefaction in a low-temperature process. The production process consumes a lot of energy. The vaporization of 1 kg of LNG at the LNG receiving station needs to provide about 830 kJ of energy, that is, about 230 kWh per ton. [0003] If the LNG cold energy can be effectively recovered and utilized, it can save energy, reduce the pollution of the LNG vaporization process, reduce the price of gas supply in the downstream market, and improve the economic benefits of natural gas. Japan, the United States, Canada and other countries have long begun to study the utilization of LNG cold energy, such as seawater desalination, air separation, low-temperature crushing, ice making, power generation, etc. [0004] Judgin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F25C1/14
Inventor 徐文东柳珉敏陈善铃冯俊杰
Owner SOUTH CHINA UNIV OF TECH
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