Method for preparing natural gas from converter tail gas and production device using the method

Abstract

The invention relates to a method for preparing a natural gas from a tail gas of a converter and a production device employing the method. The method comprises the following steps: firstly, storing the tail gas of the converter in a gas storage container of the tail gas of the converter by taking the tail gas of the converter and a coal gas of a coking furnace as raw material gases; carrying out a methanation reaction by depending on hydrogen, carbon monoxide and carbon dioxide in the raw material gases so as to convert the carbon monoxide and the carbon dioxide into methane; and separating the hydrogen from the gas after the methanation reaction so as to form the natural gas formed by the methane, wherein the volume ratio of the tail gas of the converter to the coal gas of the coking furnace is 1 to (9-12). The production device comprises a methanation device and a hydrogen separation device which are connected with each other, wherein the methanation device is connected with the gas storage container of the tail gas of the converter through a gas supplying pipe of the tail gas of the converter. The method is reasonable in process design and low in cost, and realizes the resource utilization of the tail gas of the converter, thereby avoiding resource waste and environmental pollution and improving economic benefits.

Description

Technical field [0001] The invention relates to a method for preparing natural gas from converter tail gas and a production device using this method to produce natural gas. Background technique [0002] The converter tail gas is produced during the converter steelmaking process. The carbon in the molten iron reacts with the blown oxygen at high temperature to produce a mixed gas mainly containing carbon monoxide, carbon dioxide and nitrogen. The proportion of carbon monoxide is usually nearly 50%. It is reported that top blown oxygen The content of carbon monoxide in the converter tail gas can be as high as 60-80%. Because the amount of converter tail gas is not balanced during the smelting process, the composition also changes, and the composition of the converter tail gas varies greatly under different processes and operation modes. Since the converter tail gas contains a large amount of combustible material, carbon monoxide, which is a combustible gas with medium calorific val...

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Problems solved by technology

Since the converter tail gas contains a large amount of combustible carbon monoxide, which is a combustible gas with a medium calorific value, a common way of utilization is as a fuel for industrial kilns, but this way of utilization is limited by gas equipment, and its application range is not large. Therefore, it is urgent to find a more widely used method to avoid having to empty or light sky lights because of finding no suitable way out, so as to make full use of these wasted material resources and eliminate the impact on the environment caused by emissions. pollution caused

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