Difference between single-stage gas generator and two-stage gas generator
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Advantages and disadvantages of one-stage gas generators in hot gas plants used for gasifying bituminous coal: (1) Lower construction costs: This is reflected in the lower investment required for the equipment of one-stage gas generators as well as for civil engineering works. (2) Shorter construction period: The construction time for hot gas plants using one-stage gas generators is significantly shorter compared to those using the other two types of generators, whether it comes to equipment manufacturing, installation and commissioning, or the construction of the plant infrastructure. Disadvantages: (1) Excessive ash carried by the gas: During operation of one-stage gas generators, the air layer is high and the material layer is thin; adding coal, inserting rods, and the thermal decomposition of coal result in a large amount of coal dust, which is carried away by the gas. This leads to waste of resources and blockages in the gas pipelines. (2) Poor quality of the tar produced: One-stage gas generators produce high-temperature pyrolysis tar with high viscosity and poor fluidity. Such tar is difficult to handle and utilize, and it tends to stick together with the coal dust carried by the gas, thereby causing blockages in the gas pipelines. (3) Short gas transmission distance: Tar and coal dust present in the gas accumulate within the gas pipelines, often causing blockages that increase the resistance to gas transmission and limit the distance over which gas can be transported. II. Advantages and disadvantages of two-stage gas generators used in thermal gas plants for coking coal gasification: The two-stage gas generator features a carbonization section with an appropriate height and structure, which allows the coal to be heated gradually in this section, enabling low-temperature carbonization. As a result, the tar produced does not undergo cracking, and it has low viscosity as well as good fluidity. When hot gas is transported over long distances, the pipes are less likely to get clogged
The two-stage gas generator, thanks to the addition of a carbonization section with an appropriate height and structure, allows the coal to be slowly heated in this section, enabling low-temperature carbonization. As a result, the tar produced does not undergo cracking, and it has a low viscosity as well as good fluidity. When hot gas is transported over long distances, the pipes are less likely to get clogged
The two-stage gas generator, thanks to the addition of a carbonization section with an appropriate height and structure, allows the coal to be slowly heated in this section, enabling low-temperature carbonization. As a result, the tar produced does not undergo cracking, and it has a low viscosity as well as good fluidity. When hot gas is transported over long distances, the pipes are less likely to get clogged
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