Discussion on potential issues with pressurizing the raw gas at the gasification outlet
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As the title suggests, in order to meet the requirements of dual-nozzle gasification, the dust-removed raw gas (at 200 degrees Celsius, 3.9 MPa pressure, and containing saturated steam) from a single gasification outlet is directly pressurized and mixed with high-pressure raw gas. What potential problems might arise from this? There are rewards for participation!
Previously, the pressures at the coal end and the natural gas end were not consistent; we added up the pressures from the natural gas end and used them, but it is stated that the actual content there is practically none
What is the pressure to be applied, and what should the temperature be after applying the pressure? Under pressure, some of the water vapor in the gas, as well as certain hydrocarbons and other organic compounds present in the gas, will condense into a liquid form, which must be removed during the pressurization process
Today, while thinking about it, I came up with another question: what should be used to apply direct pressure – a compressor? Can the equipment handle it?
The fresh gas compressor for syngas works in a similar way; it mainly depends on the mixing method, and adding a mixing buffer tank can help reduce fluctuations
The requirements for compressors are quite high. Raw gas is saturated; during compression liquid condensate is formed, which exerts impact on the impellers. Meanwhile, dust present in the gas can block the flow channels of the compressor. Gases such as hydrogen sulfide and carbon dioxide place high demands on the material used for impellers. High gas temperature, dirt, strong corrosiveness, and the presence of liquid create too stringent requirements for compressor selection; even dry gas seals are difficult to choose in such conditions. I don’t know if there are any compressor manufacturers in China with similar performance records. It is better to compress after transformation, as this reduces the stress on the compressor.