The blast furnace gas orifice plate cannot be removed
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Our factory has been using the lean gas enrichment process for a long time. In the past 1 or 2 years, it’s unclear whether it’s an issue with the purification of blast furnace gas or coke oven gas; this has led to severe corrosion of the orifice plates in the blast furnace gas system, as well as significant carbon deposition inside the orifice plate housings, making it impossible to remove the orifice plates. This affects temperature regulation. I wonder if other factories are facing similar problems? How was it solved? Thank you!
The main component of blast furnace gas is N2, accounting for about 55–60%, while the combustible component is CO, accounting for 25–30%. Next are CO2, dust, and moisture. In short, these substances are basically non-corrosive to orifice plates (iron). Only if the coke oven gas is not properly purified will it be corrosive to the orifice plates, leading to severe carbon deposition inside the orifice plate boxes. So let’s solve the problem from the perspective of coke oven gas.
The analysis is very thorough; I think it’s indeed a problem with the coke oven gas. Our plant’s gas treatment and purification capabilities in the recovery section are limited, and the coke oven gas has been of very poor quality over the past two years. When using this gas, the heat exchangers need to be cleaned and refueled frequently, which is extremely troublesome! Don’t know how to solve this problem?
Solving this problem is not your responsibility; it is the task of the various sections in the chemical production workshop. Desulfurization, naphthalene removal, tar removal… all meet the standards. Do you see any other such issues?
How often do you clean the exchange cock? We have also encountered this problem here recently; poor purification of the chemical process gas is causing exchange timeouts. In the past, cleaning was sufficient every three months, but now it’s necessary to clean it around every forty days~~~~