How to judge whether the coal injection pipe is excellent and reasonable

To evaluate the excellence and rationality of coal injection pipe, the core lies in whether it can effectively play the two key effects of primary air: one is to promote the full mixing of fuel and air, and the other is to ensure the lasting stability of the flame. In order to achieve the above goals, the design of coal injection pipe should follow the following ideas:

① Coal injection pipe should have sufficient thrust. Reasonable thrust design can not only optimize the flame control, make the high temperature area properly distributed, thereby extending the service life of the kiln lining, improve the clinker quality, but also effectively reduce the primary air volume and greatly reduce the heat consumption.

② The coal injection pipe should ensure that the primary wind energy effectively promotes the full mixing of fuel and air. At the nozzle, the mixing speed of the primary air and air is extremely rapid, and at the same time, the secondary air needs to be smoothly introduced into the jet stream of the primary air and fuel. In this process, the rate at which the secondary wind is carried depends on the ratio of the momentum of the primary wind and fuel jet to the momentum of the secondary wind. Therefore, increasing the flow and speed of the primary air will significantly improve the mixing efficiency of fuel and air.

③ The design of coal injection pipe also needs to pay attention to the stability of the flame. The shape of the flame is affected by many factors such as pulverized coal particle size, volatile content, atmosphere in the kiln and ejection speed. When the ejection speed is too high, it is difficult to form a stable flame. However, the excellent performance of the coal injection pipe can ensure the stability of the flame. The key technology is to construct an internal recirculation area in front of the gas nozzle, so that the burning gas is pulled back from the flame downstream, continuously igniting the newly entered fuel, thus stably anchoring the flame to the nozzle.