Ruchi process

The Ruhr process is a continuous gasification method that uses oxygen and steam as gasifying agents. The feedstock can be coking coal or lignite in the form of briquettes or shaped coal with a size of 5–50 mm. The operating pressure ranges from 2 to 10 Mpa. In the Ruhr pressurized gasifier, oxygen and water vapor pass through the coal layer from bottom to top; the coal layer is divided from top to bottom into a drying zone, a carbonization zone, a gasification zone, and a combustion zone. In the combustion zone, the main reaction is the combustion of carbon, while in the gasification zone, it is primarily the reaction between carbon and water vapor. The Luchi furnace has the following structural features: 1. The coal tank feeds raw materials into the furnace through an automatic control mechanism, and a rotating coal distributor is used to ensure even distribution of the fuel within the furnace. Due to the rotation of the distributor, it also serves to prevent the adhesive coal particles from sticking together. 2. A rotary grate is used, and the gasifying agent is fed into the grate through a hollow shaft. 3. The automatic control device continuously discharges the ash into an ash box, where it can be removed using hydraulic or mechanical methods. 4. The furnace wall is equipped with a jacketed boiler to generate medium-pressure steam. 5. The gas is cooled and washed with water in a scrubber before being sent to the purification system. The composition of the gas at the outlet of the Luchi furnace is: H2 37%~39%, CO 22%~24%, CH4 8%~12%. Since the reaction for producing methane is exothermic, less oxygen is required; generally, the ratio of oxygen to steam is 0.13~0.14 m3 of oxygen per kg of steam. The Lurgi furnace has a high steam consumption, which is intended to prevent excessive local temperatures in the bed caused by pure oxygen combustion. The Luchi furnace has now evolved to the Mark-V version; it has a diameter of 5 meters, and each unit can produce up to 100,000 m3/h of gas, which is then processed for use as city gas. If used as a feed gas for synthetic ammonia production, an installation capable of producing 1,000 tons of ammonia per day requires four ∮3800mm vaporization furnaces under normal conditions, with three in operation and one as a spare. The advantages of Lurgi gasification are: operation under pressure, a carbon conversion rate of around 90%, a high calorific value of the resulting gas, and high gasification efficiency. Its disadvantage is that it still requires high standards for the raw coal; coals or briquettes with strong cohesion, poor thermal stability, and low ash melting points cannot be used ； The high methane content in the gas, along with large amounts of tar and cyanide-containing wastewater, complicates the ammonia synthesis process.

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In other words, is it gasification? Is it similar to the source of coke oven gas, with only differences in the gas composition?