Method for preparing natural gas from yellow phosphorus tail gas and production device using method

Abstract

The invention relates to a method for preparing natural gas from yellow phosphorus tail gas and a production device using the method. The method comprises the following step: by using yellow phosphorus tail gas and coke oven gas as raw gases, carrying out methanation reaction in a methanation device by using hydrogen in the raw gases and carbon monoxide and carbon dioxide in the raw gases, wherein the ratio of the yellow phosphorus tail gas to the coke oven gas is controlled to control the ratio of the hydrogen to the carbon monoxide and carbon dioxide in the reaction system, so that the contents of the hydrogen, carbon monoxide and carbon dioxide in the gas after reaction respectively conform to the requirements for natural gas, and the volume ratio of the yellow phosphorus tail gas to the coke oven gas is 1:(9-12). The production device comprises the methanation device, a raw gas purification device before the methanation device, and a natural gas purification device after the methanation device, wherein the methanation device is a three-stage or four-stage methanation facility. The method has the advantages of reasonable technological design and low cost, recycles the yellow phosphorus tail gas, avoids waste of resources and environmental pollution, and enhances the economic benefit.

Description

technical field [0001] The invention relates to a method for preparing natural gas from yellow phosphorus tail gas and a production device for producing natural gas by using the method. Background technique [0002] my country has abundant reserves of phosphate rock resources. It is reported that the current annual output of yellow phosphorus is 80-100 tons, accounting for more than 80% of the world's total yellow phosphorus production. 3 (Standard state) yellow phosphorus tail gas, yellow phosphorus tail gas mainly contains carbon monoxide, hydrogen, methane, carbon dioxide and other components, and also contains a variety of organic and inorganic pollutants containing sulfur and phosphorus. Usually, the content of carbon monoxide is 90% About, total sulfur 0.8-8.0g / m 3 , total phosphorus 0.5-1.5g / m 3 , calorific value is about 10.5-10MJ / m 3 , due to its relatively high calorific value, the current relatively more utilization methods are as fuel and reuse in the yellow p...

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Problems solved by technology

[0002] my country has abundant reserves of phosphate rock resources. It is reported that the current annual output of yellow phosphorus is 80-100 tons, accounting for more than 80% of the world's total yellow phosphorus production. 3 (Standard state) yellow phosphorus tail gas, yellow phosphorus tail gas mainly contains carbon monoxide, hydrogen, methane, carbon dioxide and other components, and also contains a variety of organic and inorganic pollutants containing sulfur and phosphorus. Normally, the content of carbon monoxide is 90% About, total sulfur 0.8-8.0g / m 3 , total phosphorus 0.5-1.5g / m 3 , calorific value is about 10.5-10MJ / m 3 , due to its relatively high calorific value, the current relatively more utilization methods are as fuel and reuse in the yellow phosphorus production process, but due to the relatively small amount of use in this way, and direct use as fuel requires a dedicated industrial kiln Furnaces or boilers, and the pollutants in it not only have a strong corrosive effect, but also burn the flue gas to pollute the atmosphere. Therefore, how to make full use of the useful substances such as carbon monoxide contained in it, and find a way to use it for the yellow phosphorus tail gas Extensive and high-value utilization methods have become an important issue before people.

[0003] On the other hand, with the improvement of environmental protection requirements and the development of economic technology, natural gas (methane), as a clean energy, is more and more widely used in my country, and the demand is increasing. People continue to develop and prepare artificial natural gas (methane) One of the important preparation methods is to prepare coke oven gas into methane through methanation. Due to the high hydrogen content in coke oven gas, it is necessary to extract / Separated to meet the standards of natural gas, but the extraction / separation of hydrogen is not only difficult and costly, but also relatively poor in market sales, which affects economic benefits

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