What are the current technologies for coal-to-natural gas production?

Traditional technologies are well-developed, and the Lurgi furnace is a suitable choice for use as a domestic fuel. City gas has a history of nearly a century; it is not suitable as a substitute for natural gas in industrial applications due to its long production process and low overall energy efficiency. For information on new technologies, please refer to http://bbs.hcbbs.com/viewthread.php?tid=259913&highlight=%C0%B6%C6%F8

Patented technologies for coal-to-natural gas include DAVY, TOPSOE, etc.

The key technologies for coal-to-natural gas production are gasification technology and the main processes for converting syngas into methane. Among the various gasification techniques used for gas production, the Lurgi furnace is a suitable choice as it operates steadily; as for the conversion of syngas into natural gas, technologies such as DAVY and TOPSOE are employed.

Thank you all for your guidance; it would be even better if it could be more detailed

It seems that Datang Fuxin plans to use the Lurgi process for coal-to-natural gas production, with over forty reactors involved

Coal-to-natural gas production generally refers to either the one-step method or the two-step method. The two-step method involves converting coal gas into syngas and then carrying out methanation; this process comprises four steps: coal gasification, shift reaction, purification, and methanation. The direct method, which is the one-step method, is the approach mentioned recently by Juedian Energy Company.

Coal-to-natural gas is a process in which coal is gasified to produce syngas, which is then subjected to methanation to create synthetic natural gas (SNG) with a calorific value of over 8000 kcal/m3. Datang International has investments in a number of projects. Experts in coal chemical industry believe that coal-to-natural gas has a clear competitive advantage over other coal-based energy products. Firstly, this is reflected in the simple process flow of coal-to-natural gas, as well as its mature and reliable technology ； Low consumption, low investment. Methane synthesis can be carried out at coal gasification pressures; compared to the production of methanol and dimethyl ether, it eliminates multiple steps, and compared to coal-based synthetic oils, it requires even fewer processing units. Secondly, it has a low investment cost per unit of heat value and the highest overall thermal efficiency. Third, coal-to-natural gas conversion features high conversion and selectivity, with the conversion rates of CO and H2 approaching 100%. Fourth, coal-to-natural gas has a high waste heat utilization rate; the superheated steam generated as a by-product of the synthesis of natural gas can be used in the turbine cycles and air compressors of this facility, resulting in good economic benefits. Furthermore, coal-to-natural gas is more environmentally friendly; its wastewater contains no harmful substances and is easy to use, allowing it to be used as boiler feed water or makeup water for circulating water without any treatment required. In contrast, coal-to-methanol and synthetic oils require advanced treatment of their wastewater.

Coal-to-natural gas is beneficial to both the country and its people at present.

Coal gasification – shift reaction – purification – methanation – natural gas. The Ruhr process is the most suitable for the gasification of coal to produce natural gas, as it results in the highest methane content in the syngas

There are currently two methods for producing natural gas from coal. 1. One-step method: This process involves four steps – coal gasification, shift reaction, purification, and methanation. It involves first converting coal into syngas and then carrying out methanation using iron-nickel catalysts, such as in the Topsol technology. The main problems with this approach are high energy consumption and the tendency of the catalysts to become poisoned； 2. Two-step method: Convert coal directly into methane, usually using water as the gasifying agent and employing catalytic gasification. Such as the project that American giant Enphase Energy is working on.

Who has any information on coal-to-natural gas? Please send it over for me to study; thanks

A more direct method is the direct gasification of coal to produce methane, using water as the gasifying agent. It undergoes further purification treatment. But coal-to-natural gas is not as good as developing and using new energy sources!

Hehe, do you guys think it’s feasible to directly gasify coal underground? New Energy is working on this, and I wonder if there are any technical problems that cannot be solved.