Texaco gasification – some questions for clarification
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This post was last edited by jensse on 2015-9-15 10:42. 1. What pressure difference between coal slurry and oxygen is required to stop the gasification furnace? 2. What is the proportion of syngas? 3. How to feed the gasifier continuously? Is there a version that allows continuous operation under pressure? 4. What should be done if the gasification furnace is often filled with water? The high-pressure ash water pump (deaeration water pump) has failed, and the standby pump will not start – what should be done?
Follow the installation procedures; safety interlocks must be implemented, depending on your design specifications and process requirements. . . . . . . . . . . . .
Follow the procedures, and you’ll understand. It’s better to do it yourself once than to be told a thousand times.
Question 1: The pressure difference between the coal slurry pipeline and the gasifier is around 0.3~0.7 MPa, while the pressure difference between the oxygen pipeline and the gasifier is around 1.0~1.5 MPa. Generally, as operating time increases, burner wear leads to a gradual decrease in the pressure difference between the slurry pipeline and the gasifier; whereas, provided there are no issues with the air separation unit, the pressure difference in the oxygen pipeline generally does not decrease ； Question 2: The term \"proportion of syngas content\" is quite strange; it’s not clear whether the poster is referring to the ratio of syngas to dry gas in water gas, or the ratio of useful gas components. Additionally, it’s not known what type of furnace is being used, as these two ratios vary depending on the furnace type. In terms of useful gas components, single-nozzle water coal slurry has a ratio of 76%~82% (on a dry basis), while coal powder furnaces can achieve a ratio of over 90% (on a dry basis) ； Question 3: Different furnace types have different continuous feeding schemes; since I’m not aware of your furnace type, it’s difficult to provide a description here
The four-nozzle model can be used for continuous feeding under pressure, but the load must be reduced to the lowest level possible!
The standby pump cannot start; if water is added promptly within a short time, it’s fine, but if this takes too long, the machine will need to be shut down for maintenance
Every question you raise can serve as a topic for in-depth discussion. Given the type of furnace and pressure level, it is recommended to refer to your company’s operating procedures, which should contain detailed information on these aspects.
The problem description is not clear. Let me talk about feeding under pressure: I’ve never seen it done with Texaco units, but it’s possible to do it with four-nozzle units
The backup pump won’t start, so the machine has to be shut down.