Are there any other fertilizer companies that use Lurgi pressure gasification?
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In China, apart from fertilizer companies that use Lurgi gasifiers, are there any other fertilizer enterprises that employ Lurgi pressure gasification? If so, what is the coal feeding rate, and in which year were these facilities put into operation?
The most typical enterprise in China that uses LURGI gasifiers is Shanxi Tianji Chemical Group Company (formerly Shanxi Fertilizer Factory). In the 1980s, 4 LURGI gasifiers of the Mark-IV type were introduced (with an inner diameter of 38 m, a height of 127 m, and a gas production capacity of 36,000 m3 per unit per hour). They came online in 1987, and another one was added later; currently, there are 5 such gasifiers in total. In addition to fertilizer manufacturers, there are two other companies in China that primarily produce gas and use this technology: 1. Yima Gasification Plant of Henan Gas Group (5 units, 3 in Phase I + 2 in Phase II); 2. Harbin Gasification Plant (5 units). This post was last edited by zjyang168168 on 2007-11-26 at 14:47
Fertilizer plants use Lurgi pressure swing gasification – so how is the methane in that crude syngas utilized?
Shanxi Lu’an Coal-based Synthetic Oil Co., Ltd. is installing 6 Lurgi Mark IV units, with the first unit expected to arrive in December.
When producing syngas using a Lurgi gasifier, the gas composition contains a high level of methane (8%-10%); therefore, a methane separation unit is required after the gasifier. Liquid nitrogen washing is generally used to remove methane in order to meet the requirements for the composition of the feed gas in ammonia synthesis. The gasification pressure in the Lurgi pressurized gasification process is generally 3.0 MPa, with a gasification temperature of 900–1050°C. The raw coal used in this process has a particle size of 8–50 mm, and it is required to use bituminous coal or lignite that is highly reactive and does not stick together. It operates in a solid slag discharge mode. The coal feeding rate per furnace is 1,000 t/d. The gas production rate of a single DN3800 Lurgi furnace (under standard conditions) is 35,000–55,000 m3/h. The volume fraction of (CO+H2) in the raw gas reaches 65%, the volume fraction of CH4 is 9%, and it also contains C2 compounds and coal tar. The source of raw materials is limited ； The content of useful gases in the gas is low ； Environmental treatment is difficult ； Therefore, it lacks a technical advantage when compared to TEXACO or SHELL, which is the main reason why it is difficult to achieve large-scale adoption in the ammonia synthesis industry. This post was last edited by zjyang168168 on 2007-11-26 18:09.]
Due to the low gasification temperature in Ruqi gasifiers, the syngas produced contains a high level of methane; therefore, it is generally used as city gas. Companies such as Shanxi Lu’an Coal-based Synthetic Oil Co., Ltd. need to install methane conversion units, which carry out the reverse reaction of the shift reaction to convert methane into useful components；
Hello zjyang168168, what is liquid nitrogen nail cleaning? Could you be more detailed? Thank you!
In the gas produced from coal in Ruchi furnaces, methane is primarily recovered through deep cooling (at temperatures of around -170 to -180 degrees Celsius). Liquid nitrogen washing is used mainly to remove trace amounts of CO and other gases. The exhaust gas generated is used as fuel. The two-washing process employed by Tianji Group (Shanxi Fertilizer Plant) is not significantly different from that used in other ammonia synthesis plants that utilize coal for gas production; the difference lies in the fact that the low-temperature methanol washing process includes an additional step for extracting light oil, while the liquid nitrogen washing process includes an additional step for intermediate cooling separation, aimed at recovering methane. The recovered methane is then used in two-stage methanation processes as well as in high- and low-pressure shift reactions to produce hydrogen for ammonia synthesis.
What are the ways these plants utilize the by-products of gasification, such as coke, phenol, and things like that? How effective is it? Could you introduce it?