Coal-to-natural gas

Main process: Coal preparation (5–50 mm) – coal gasification under pressure using the Lurgi process – cooling of the raw coal gas – purification through low-temperature methanol washing – absorption refrigeration – methanization – drying – production of the final product. There are also side processes for the recovery of phenol, ammonia, and sulfur, as well as treatment of wastewater and residues. The plant is located in Keshiketeng Banner; preliminary design work has already been carried out by the Second Chemical Engineering Institute. Some equipment procurement activities have taken place, but the specifics are not clear. The designed production capacity is 4 billion cubic meters per year; further details are limited

What else would you like to know? Let’s communicate as much as possible within the allowed limits, ha~:loveliness:

Abbreviation: SNG. In this regard, LURGI is currently the best at it, having extensive experience in various projects. Among them, the first SNG project is the one in the American Great Plains, which has a history of 25 years now. If BZ wants to learn more about this topic, they can leave me a message so we can work together to improve it. :handshake

Does the expert on the 2nd floor work at Great Tang? It seems like they know a lot about it

Could the expert on the 4th floor explain the detailed manufacturing process and principles?

The syngas is first preheated and passed through a sulfur protection reactor, which is used to remove any remaining trace amounts of sulfur from the feed gas. The sulfur component can poison the downstream methanation catalyst, so it must be removed to very low levels. After desulfurization, the raw gas is heated and mixed with the recycle gas coming from the first methanation reactor; after mixing, it passes through the first methanation reactor. In the methanation reaction, CO and CO2 react with H2 to form CH4, as shown in the following reactions: CO + 3 H2 = CH4 + H2O; CO2 + 4 H2 = CH4 + 2 H2O. These two reactions are highly exothermic. The outlet gas from the methanation reactor is cooled by the high-pressure superheated steam produced. To control the temperature rise in the first reactor, a portion of the cooled gas is recycled into the reaction. Before mixing with the feed gas, the recycle gas is further cooled by preheating it with boiler feedwater, and then compressed in a hot gas recirculation compressor. The methanation reaction uses a proprietary Topsoe nickel-based catalyst, model MCR-2R. This catalyst is characterized by maintaining high activity over a wide temperature range, which allows the circulation gas volume to be as low as possible, thereby resulting in a smaller size for the circulation compressor. Part of the partially methanated syngas passes through as many as three methanation reactors in sequence, to achieve almost complete conversion of CO into CH4. The product gas is primarily composed of CH4, with trace amounts of H2 and CO2, and possibly inert gases such as N2 and Ar. It is then cooled to ambient temperature and dried to meet the specifications required for natural gas pipelines. The vast majority of the reaction heat in the methanation reaction is recovered by generating high-pressure superheated steam through some heat exchangers, which can then be used as energy in steam turbines.

Is the process used in the Datang project that on the 7th floor?

I’m not from Great Tang The process at Great Tang differs from that described on the 4th floor for the Great Plains; the types of coal used in the initial design are different from those used in actual operations, which has led to many changes. The key issue now is the treatment of residual liquid waste. The original plan for the Great Plain was to use incineration, but that method has never been put into use; it seems there are problems again lately – entry is not allowed. The bidding process for gasification units must have already ended. Bringing in foreign expertise for methanization is too complicated… Everyone here is just working employees; if I go into too much detail, trouble will arise. There are also technicians from Datang among the staff at HaiChuan, and they will come after me for problems

I want to ask the original poster what their purpose for understanding this project is :lol

This topic is also called “pit gasification”.

Following closely~~~ It is said that something has happened on the Great Plains, but the details are unknown. .

The Great Plains stopped operating on December 19 last year; it was the first unplanned shutdown for this aircraft in over 20 years of service in the United States. The reason was a malfunction in the EXTRACTOR equipment, which was sent for repair. The manufacturer is taking this opportunity to carry out maintenance across the entire plant.