Main features of Shell gasification
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The main features of Shell gasification are as follows: 1. It can use various types of coal such as lignite, bituminous coal, and tar sand, with a carbon conversion rate of over 90%. Differences in sulfur, oxygen, ash content, and caking property in coal have no significant effect on the process. 2. The CO+H2 content in the product gas exceeds 90%, making it suitable as syngas; in particular, since there is very little CO2 in the gas, this **reduces the costs associated with treating acidic gases, and the gasification products contain no tar or similar substances. 3. Due to the use of dry feeding, oxygen consumption is reduced and the efficiency of cold gas is increased; dry feeding results in a pressure that is about 2 percentage points higher than that of wet feeding. However, the increase in gasification pressure achievable with dry feeding is limited, whereas slurry feeding allows the operating pressure to be increased as needed. 4. The production capacity per furnace is high; the overall processing capacity of the facility can reach 3,000 tons per day. 5. It meets environmental requirements – sulfur and ammonia in the raw gas can be easily removed, and most of the ash in the coal turns into glass-like solids that can be used as building materials.
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“Most of the ash in coal turns into a glass-like solid that can be used as building material. I would like to ask whether this material, when used as building material, contains any radioactive elements
The fly ash gasification process technology developed by Shell belongs to the second generation of coal gasification technologies and features the following: 1. The gasifier is equipped with a modular water wall, enabling it to withstand gasification temperatures as high as 1700°C. There are fewer restrictions on the ash melting point of the raw coal, allowing for the gasification of coal with high ash melting points. 2 Since dry powder is used as the feed, the concentration of active gases (CO+H2) in the crude syngas is as high as 98%, with a low CO2 content. 3 High gasification efficiency, low consumption of raw coal and oxygen; carbon conversion rate ≥99%, with high utilization rate of raw materials. 4 The single furnace has a large production capacity and a long operating cycle, eliminating the need for a backup furnace. 5 Water wall and waste boiler are employed to generate medium-high pressure steam as a by-product, enabling comprehensive utilization of energy. With more than 6 sets of burner configurations for the martyrs’ burners, it is possible to adjust the output volume of syngas by shutting down one or several sets of burners, providing considerable operational flexibility. 7 After passing through high-pressure and high-temperature filters as well as water washing for dust removal, the dust content in the crude syngas can be reduced to below 1 mg/NM3, thereby protecting the catalysts in the subsequent shift units. 8 The process technology is advanced and reliable; a gasification unit capable of processing 2,000 tons of coal per day in a single furnace has been successfully installed in Demkolec, the Netherlands, for use in combined cycle power generation. In China, the factories that are currently introducing this technology include Dongting Fertilizer Plant, Liuzhou, Shuanghuan and other companies, with a total of 13 units in operation. The main drawbacks of the SHELL process are as follows: 1. The gasifier and waste heat boiler have complex structures, making them difficult to manufacture; currently, their internal components and key equipment still need to be imported ； For the same production scale, the investment is relatively high. 2 The equipment is large, which poses certain difficulties for transportation; on-site assembly would further increase costs. 3 Since there is no backup furnace, the factory must have excellent management capabilities ； The continuous operation of the factory is difficult to ensure. 4. At present, there is no long-term operation experience in the country, and successful operational management and experience are lacking.
Few sets can fully appreciate the features of SHELL
Shell’s stoves have a good market