Will the steam added during the pulverized coal gasification process increase the yield of useful gas?
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Will the steam added during the pulverized coal gasification process increase the yield of useful gas?
Then why add water vapor? In the gasification reaction, the gasifying agents are CO2 and H2O(g); therefore, the addition of water vapor leads to the following reactions: C + H2O(g) = CO + H2, and CO + H2O(g) = CO2 + H2
Water vapor is used; one reason is to participate in the reaction and reduce the furnace temperature, and the most important reason is the economic benefit it provides by reducing ash and residual carbon
When adding water vapor, it is important to maintain the right amount; an appropriate level of vapor can help regulate the composition of the syngas. At high temperatures, water can react with carbon to form water gas, and it can also help reduce the temperature in the area surrounding the burner nozzle, thereby providing effective protection for that area. However, the amount of vapor added must be controlled carefully, as too much vapor can lead to the formation of slag deposits, which makes it difficult to control the shape of the slag. In severe cases, this can cause blockages, and it can also increase the viscosity of the ash, leading to easier accumulation of ash.
The addition of steam allows for better control of the temperature in the gasification furnace’s reaction chamber, and it also helps to reduce coal consumption; therefore, it is beneficial to add steam.
Teacher on the 6th floor: Could you explain why scaling occurs in certain areas when too much steam is used?
The experiences of many comrades upstairs are specific to the particular gasification techniques they are familiar with, so it’s not possible to generalize them. For a specific furnace, the degree to which steam is added needs to be analyzed specifically. The claim that adding water vapor reduces coal consumption and lowers the carbon residue content is unfounded.
The primary reason for adding water vapor is to adjust the H2/CO ratio in the raw gas; the amount of vapor added varies depending on the type of gasifier and the requirements of the desired product. Of course, it also serves other purposes such as reducing the oxygen content in the gasifying agent, protecting the burners, and alleviating the gasification temperature
Thank you all for your active participation. My thinking is that in order to achieve a strong reaction and a high carbon conversion rate, an adequate supply of oxygen is necessary. When the oxygen level is high, the reaction temperature also rises. By introducing some steam at this point, it’s as if more oxygen is added, while at the same time the furnace temperature is reduced; therefore, the carbon conversion rate should remain high, which in turn means an increased gas output. The prerequisite is that the calorific value of coal is high; otherwise, it will affect the progress of the reaction. I’m not sure if this is correct; please feel free to correct me.