Technology for converting coke oven gas into natural gas

Zhong Zhimin, general manager of Qu Ran Company, briefed reporters on the project of converting coke oven gas into LNG. The factory building under construction. L-CNG hub station. Yunnan Net News (Reporters: Yang Chunping, Cao Yi) By the end of this year, 5,000 households in Qujing City will have access to safe and clean natural gas; this figure is expected to rise to 15,000 households by the end of next year, with full coverage of Qujing’s urban areas achieved by 2015. This is a transformative measure taken by YunTou Group to uphold the scientific development concept and strategically adjust the energy structure of our province. On the afternoon of August 23, a group of journalists visited Qujing Gas Co., Ltd. (hereinafter referred to as “Qujing Gas Company”) to inspect the natural gas production facility in Qujing on site. It was the first in the country to achieve industrialization in the field of coal-to-natural gas production. According to Su Shaoliang, the chairman of QuRan Company, this company is a subsidiary controlled by Yuntou Group; it was registered and established in June 2008. It was founded through joint investment by Yuntou Group, Beijing Zhongran Weiyee Gas Co., Ltd., and Qujing City Development and Investment Co., Ltd. It is the only company in Qujing that has been granted a franchise by the local authorities to invest in and build urban pipeline gas systems, as well as to produce and supply natural gas. Since its establishment, the company has made gas technology innovation a top priority for enhancing its core competitive advantages and ensuring long-term sustainable development. It adopted a development strategy that emphasizes technology as the driving force. The company set up specialized R&D centers and urban gas planning firms, and hired experienced experts in the gas industry as consultants. In collaboration with Shanghai Huaxi Technology, it developed the \"Qujing City 8500 Nm3/h Coke Oven Gas to LNG Project\" and the \"Fuyuan County Annual Production of 9.6 million Nm3 of Low-Concentration Coalbed Methane to CNG Project\", thereby becoming the first in the country to achieve industrial production in the fields of coal-based gas production and low-concentration coalbed methane conversion into natural gas. Developing pipeline gas is an inevitable trend, said Zhong Zhimin, general manager of Qu Ruan Company. At present, most residents in Qujing use bottled liquefied petroleum gas (LPG). Apart from its relatively high price, burning LPG produces carbon monoxide, which can lead to gas poisoning. Natural gas, on the other hand, offers advantages such as safety, cleanliness, efficiency, and low cost. For example, each 13-kilogram bottle of LPG costs around 110 yuan on the market, which is equivalent to 7.11 yuan per cubic meter in terms of natural gas prices; currently, the price of natural gas is 5.25 yuan per cubic meter. It takes 10 minutes to heat water using LPG, while it only takes 3 minutes with natural gas. In comparison, using natural gas is much more convenient and cost-effective. Moreover, as the company’s natural gas projects come online, the price of natural gas will be even lower. Zhong Zhimin said that the coke oven gas conversion project uses the excess gas generated during ironmaking and coking at the Yuegang Group as raw material. By employing domestically advanced technologies for deep purification, synthesis, and separation of refrigerant mixtures, and through processes such as desulfurization, compression, purification, methanation, and cryogenic separation, liquefied natural gas that meets **natural gas standards is produced. The first phase of this project began construction in February this year, with completion and operation planned for the end of the year; at that time, it will be able to produce around 80,000 cubic meters of natural gas per day and 27 million cubic meters per year. Once the second phase is completed, the production capacity will rise to 240,000 cubic meters of natural gas per day and 100 million cubic meters per year. This project not only allows for the reuse of large amounts of excess gas from ironmaking and coking but also generates natural gas, thereby achieving energy savings and emission reductions while also reflecting an integrated use of energy and resources. “The project in Fuyuan County to produce 9.6 million Nm3 of compressed natural gas (CNG) annually from low-concentration coalbed methane is another technological project of the company, said Zhong Zhimin. Yunnan is one of China’s key coal production areas, and Fuyuan County is one of the coal-producing regions there. Qu Ran Company uses the low-concentration coalbed methane extracted from the Jike Coal Mine in Fuyuan County – a clean energy source with high calorific value and no pollution – as the feedstock to build a facility that, through concentration and purification processes, produces 9.6 million Nm3 of CNG per year, along with the necessary supporting systems. This project is Yunnan Province’s first coalbed methane natural gas production facility, and it is at the forefront nationwide. Once it is built and put into operation, it will not only enable the effective utilization of low-concentration coalbed methane resources, turning what is currently mostly released directly into the atmosphere into a valuable resource, but it will also help reduce the greenhouse gas methane by using it to produce clean energy in the form of natural gas. This brings significant social benefits in terms of economic development and environmental protection, and it also holds great strategic importance for ensuring a stable supply of pipeline natural gas in the cities of Yunnan Province. It is reported that Qu Ran Company will also build a large-scale energy strategic reserve facility covering an area of 2,000 mu.

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