What is the main function of high-pressure nitrogen in water-coal slurry gasification?

Transporting pulverized coal, as well as soot blowing for boilers and filters

Functions of high-pressure nitrogen: 1. Protect the thermocouples; 2. Purge the oxygen pipeline and slurry pipeline during material feeding and shutdown

1. Used for purging coal slurry and oxygen pipelines. 2. As sealing nitrogen. 3. As soot-blowing gas for pressure guiding pipelines in the gasifier

As mentioned above, high-pressure nitrogen in water-coal slurry gasification is primarily used to support the safety system. Before introducing oxygen along with the feed material, a nitrogen shield is established between the oxygen inlet valve and the oxygen flow control valve, to ensure that the oxygen flow rate does not become too high during oxygen introduction.

It involves purging the entire gasification system with nitrogen.

The person on the 2nd floor misled everyone; high-pressure nitrogen is not used in that way in coal water slurry gasification. That’s just another application for high-pressure nitrogen, and yet they still got a reward for it! ! I have some doubts regarding the second use case mentioned by friend linfan78 on the 3rd floor; generally, the nitrogen used for sealing is nitrogen that has been depressurized from high-pressure nitrogen. For example, the high-pressure nitrogen used in 4.0 MPa gasification furnaces is at 12.0 MPa, while the nitrogen used for sealing is at 7.5 MPa; if one insists on calling it high-pressure nitrogen as well, that’s certainly possible!

It’s off-topic; the term “hugging” refers to coal water slurry, not pulverized coal. Please pay attention to the question – and yet they still give scores for this! I’m sorry for finding faults with you! :P should have sealed nitrogen protection as its main function, with displacement being the secondary function. This post was last edited by GSP on 2008-6-3 09:13]

Start-up and shutdown, purging of oxygen and slurry pipelines, and pressure maintenance of the oxygen pipeline

High-pressure nitrogen refers to nitrogen at a pressure of 12 MPa. During normal operation, the pressure-taking tube at the furnace head uses nitrogen not only to blow away the ash and slag carried out by the gasification furnace but also to serve a cooling purpose ； II. Used to protect the thermocouple at the temperature measurement point ； III. It is used to purge the oxygen and coal slurry pipelines during startup and shutdown, to remove gas from the furnace, and to partially replace the gas in the gasification furnace ； IV. When the gasification furnace is shut down, some of it is used to isolate oxygen and prevent hazards caused by leaks. Also, before introducing oxygen, nitrogen that has been partially depressurized (to 6.5 MPa) is used to dilute the oxygen; however, this is not high-pressure nitrogen. Furthermore, high-pressure nitrogen is not used for replacement after the system is shut down; at that time, the pressure of nitrogen is roughly 5.9 MPa.:lol

12 MPa nitrogen, used for shutdown purging of vaporizers, or as an oxygen nitrogen plug. 2 Electrode protection, but 3 Process gas purging