Pulverized coal pressurized gasification furnace channel flow
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I have been learning about *coal pulverization pressurized gasification furnaces recently, and I would like to understand the reasons for channeling phenomena in such furnaces, what these phenomena entail, and what measures can be taken to address them. I would appreciate it if the experts on this forum could share their insights. Thank you.
Why is there no one... The experts in fixed-bed systems should step in to help.
What are the reasons for channeling in gasifiers, what are the specific manifestations, and what are the countermeasures? . . . . . Gouging is caused by channels with low local resistance, and the main reason for the formation of such channels is the accumulation of coals with large particle sizes ； The formation of channeling reduces the efficiency of the three transfers and one reaction; the specific manifestations are a decline in the quality of the gas (high CO2 levels) and a rise in the gas temperature ； The main countermeasures involve controlling the particle size of the coal fed into the furnace, striving to keep the maximum and minimum values within 2, and addressing the issue in real time by increasing the slag discharge rate and the steam-to-oxygen ratio.
How to interpret a maximum/minimum granularity of 2?
Thank you for your answer. It seems that the occurrence of gully flow constitutes a major production accident; what indicators (including CO2 levels) might it cause to change significantly? At what levels beyond these thresholds should the system be shut down?
How to interpret a maximum/minimum granularity of 2? .....That is, the ratio of the maximum diameter to the minimum diameter of the coal particles fed into the furnace should be kept below 2.
The occurrence of gully flow is a major production accident; which parameters (including CO2 levels) might experience significant changes as a result? At what levels beyond these thresholds should the system be shut down? .......This problem can be better resolved by making some adjustments to the control system: when the quality of coal and the operating conditions remain unchanged, a baseline value for the CO2 content in the gas mixture, as well as a baseline value for temperature (or additional baseline values for other parameters) should be set in advance ； However, for gully flow, CO2 and temperature should suffice); when the change in the control base value exceeds a certain threshold (which depends on the coal quality), adjusting the slag discharge rate and the steam-to-oxygen ratio in real time can be used to address the issue, and if a stirrer is available, it can also be used to speed up the resolution. In the case of gas production in a single furnace, if the parameters of the gas composition exceed the required standards, the operation must be stopped ； If gas is produced in multiple furnaces, there is no need to shut down the furnace if the composition parameters of the gas meet the production requirements.
It is best not to put the gas stove into shutdown mode; generally, it can be adjusted by operating at a low load. Parking is not safe.
Thank you for your help! :handshake
This post was last edited by lflsedin on 2015-8-23 at 18:37. Is 2 the maximum/minimum value? Isn’t it true that the ratio of the maximum diameter to the minimum diameter should not be greater than 8?
Gouging phenomenon in gasifiers is quite common; no shutdown is required as long as adjustments are made in a timely manner. Method 1: If detected early, adjust by alternating between high-speed operation in forward and reverse directions. Method 2: Reduce the load, increase the gas-to-oxygen ratio, and alternate between high-speed operation in forward and reverse directions. Method 3: If slagging or coking within the furnace has caused gouging, wait until shutdown to address it