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A method for capturing carbon dioxide in ore smelting waste gas using lng cold energy

A carbon dioxide and ore technology, applied in the field of carbon dioxide capture, can solve the problems of energy consumption, waste, and failure to recycle LNG cold energy resources, and achieve the effect of reducing carbon emissions and increasing cold energy power generation links

Active Publication Date: 2017-02-01
NORTHEASTERN UNIV +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the current gasification method of natural gas has low initial construction cost, it consumes energy during operation and does not recycle LNG cold energy resources, resulting in great waste

Method used

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  • A method for capturing carbon dioxide in ore smelting waste gas using lng cold energy

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Embodiment Construction

[0030] The invention discloses a method for capturing carbon dioxide in ore smelting exhaust gas utilizing LNG cold energy, which is characterized in that: utilizing LNG cold energy and waste heat of exhaust gas in ore smelting, adopting Rankine cycle cold energy to generate electricity, and simultaneously producing liquid carbon dioxide and Dry ice, which vaporizes natural gas. When the temperature of natural gas rises from -162°C to 20°C, the pressure during the liquefaction of carbon dioxide can be greatly reduced (about 0.15MPa), and at the same time, electricity can be output externally.

[0031] The liquefied natural gas is pumped out from the storage tank and enters the power generation cycle in the Rankine cycle power generation system to provide cooling capacity for the condenser. After the circulating working medium in the power generation system is condensed from gas to supercooled liquid, the temperature of the liquefied natural gas rises. into the front-end heat e...

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Abstract

The present invention is a method for capturing carbon dioxide in the waste gas of ore smelting using LNG cold energy. It belongs to the field of environmental protection and specifically relates to a method of capturing carbon dioxide in the waste gas generated by ore smelting using the cold energy of liquefied natural gas. It is characterized in that it uses LNG cold energy and waste heat of waste gas in ore smelting, uses Rankine cycle cold energy to generate electricity, gasifies natural gas, and produces liquid carbon dioxide and dry ice at the same time. The invention can centrally capture all unorganized carbon dioxide emissions and greatly reduce carbon emissions during the magnesite smelting process. It combines two-stage Rankine cycle power generation to achieve temperature matching and cascade utilization. There is no need to compress carbon dioxide to pressurize it. It only needs an induced draft fan to draw out the carbon dioxide gas. This can greatly reduce the power consumption of carbon dioxide capture and save more than 70% of energy compared with the existing low-pressure method (2.0MPa).

Description

[0001] Technical field: [0002] The invention belongs to the field of environmental protection, and in particular relates to a method for capturing carbon dioxide in waste gas produced by ore smelting by utilizing the cold energy of liquefied natural gas. [0003] Background technique: [0004] my country's magnesite resources are abundant and widely distributed. Among them, Liaoning has the most abundant reserves, and the reserves and output of Liaoning magnesite ore, as well as the production and export volume of magnesite refractories rank first in the world. Total proven reserves of magnesite 30.06×10 9 t, reserved reserves 29.19×10 9 t, accounting for 82.2% of the province. According to the main reaction formula in the magnesite smelting process, it can be estimated that for every 1 ton of magnesium oxide finished product, 1.1 ton of carbon dioxide gas will be produced. In 2013, the production of magnesium oxide products in Liaoning Province was 7.837×10 6 t, calcula...

Claims

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Application Information

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IPC IPC(8): F01K27/00F01K25/10F25J1/00C01B31/20F17C7/04C01B32/50
CPCY02P20/129Y02P20/10F25J2210/62F25J2210/70F25J2235/60F25J1/0222F25J1/0027F25J2210/06F25J1/0264F25J1/0221
Inventor 董辉赵亮张利慧
Owner NORTHEASTERN UNIV
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