Instrument air
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Is the pressure level of the gasification furnace related to the instrument air? Please specify the pressures for gasification furnaces at 4.0 MPA, 6.5 MPA, 8.7 MPA, and 3.0 MPA. Additionally, what type of coal grinder is suitable for use in gasification currently, and how should such a grinder be started and stopped?
The pressure level in the gasification furnace seems to have little to do with instrument air; it is more likely related to the scale of operation, that is, to the amount of material that the instruments are meant to measure, or perhaps to the range of those instruments! I don’t know if it makes sense! ? The selection of a mill should be determined based on the series parameters of the coal type being used. There is a dedicated post on the forum regarding the start-up and shutdown of mills; reading it will provide a lot of useful information! This post was last edited by GSP on 2008-1-8 15:00]
1. The pressures you mentioned are all pressures within the process system, while the instrument air pressure is unrelated to these pressures; it is simply used in the Ruqi furnace during startup to heat the furnace using high-pressure air. 2. The mill should be selected based on the type of coal and the requirements for coal grinding; as for starting the mill, it can be optimized by following the startup procedures provided by the manufacturer. :) This post was last edited by zdkzhy on 2008-1-8 14:45 ]
Instrument air and the pressure in the gasification furnace are two completely different concepts; there is no connection between them at all. Instrument air serves as the power source for control valves and falls under the category of instrumentation devices, while the pressure in the gasification furnace relates to process parameters – the two are not necessarily linked.
Brief answer: 1. The pressure of instrument air and that of the gasification furnace belong to entirely different categories; the only requirements are regarding dryness, cleanliness, and pressure (0.5–0.7 MPa). Specific details can be found in the relevant design specifications. 2. Different gasification processes have varying requirements for the coal fed into the furnace, and accordingly different types of coal mills are needed; the specific choice depends on the gasification process. Currently, rod mills are widely used in the gasification processes of TEXACO or SHELL. 3. The manufacturer provides detailed instructions regarding the startup, shutdown requirements, and maintenance of different coal grinding mills; there are also relevant posts on forums that the original poster can refer to.
I think what the original poster is referring to might be the purge gas for certain instruments, such as those used to measure pressure differences or pressures. In that case, the pressure of the gas used for these instruments must be higher than the operating pressure of the vaporization furnace; however, the amount of gas required for this purpose is quite small. What are the other people’s opinions?