Issues related to the composition of coke oven flue gas
Thread Content
Hello everyone, I have a question: 1. If blast furnace gas is used as fuel, or if blast furnace gas is mixed with coke oven gas, will there be components such as dust in the resulting coke oven gas during actual production? Is it because of this that clogging occurs in the heat storage material? ? 2. A certain space is left above the heat storage material in the heat storage chamber for ammonia injection – can this help reduce NOx levels? Are there any safety risks such as explosions associated with ammonia spraying? Thank you all for your answers!
Is there a mixing ratio? 1. First, you need to understand the structure of the coke oven; its combustion chamber and carbonization chamber are separate from each other. Therefore, as long as you use purified blast furnace gas, it should theoretically not cause blockages in the regenerator! However, a large amount of flue gas is generated when blast furnace gas is burned. If the mixing ratio is high, the amount of flue gas produced becomes excessive; and with the flue gas flow area in the regenerator remaining unchanged, there will inevitably be greater resistance to flue gas flow. I believe it’s not dust clogging the regenerator that is the problem, but rather gas resistance causing poor flue gas flow. 2. I remember the temperature above the regenerator in the coke oven to be around 1000 degrees or so, right? Using ammonia injection should be able to reduce the NOx content in flue gas, which is similar to the SNCR denitration technology; it is theoretically feasible
Burning mixed gas generally does not cause blockages in the regenerator grid bricks; even if blast furnace gas contains some dust, over time this will only result in increased resistance in the regenerator, and this can be determined by taking measurements. Ammonia injection denitration tests have been conducted at the top of the regenerator; it is widely used in power plants and cement factories, and while it is theoretically feasible for coke ovens, it is difficult to implement in practice. The side regenerator is a bit better. The denitration efficiency is around 40%. If ammonia is sprayed directly from the top of the regenerator in the middle, the NOx levels may increase.
Why not spray it in the flue? Which part do you mean by the heat storage element? Are you referring to the grid bricks? The regenerator is made of silica bricks, which cannot withstand sudden changes in temperature. The exhaust gas contains various components such as CO, CO2, SO2, nitrogen oxides, dust, O2, etc. These are the main parameters monitored for environmental protection purposes. Ammonia water is used primarily to reduce SO2 and dust levels