Effect of the opening degree of the baffle on the coal mill differential pressure for K1102 circulation fans
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As the title suggests, sometimes the coal grinder experiences high differential pressure due to high load. I’m wondering what effect the opening degree of the circulation fan dampers has on the differential pressure in the coal grinder
Why isn’t anyone answering? ! ! ! ! ! ! ! !
Of course it has an impact. Does the operating procedure require that \"air should be supplied first before adding coal\"? This is the most basic requirement. Increasing airflow means opening the dampers wider to boost air volume and wind speed.
Reply to 3# shell gasification job application: It’s not necessarily the increase in air flow that leads to an increase in pressure difference. When the load increases, if the air flow cannot keep up, less coal powder is carried away by the wind, resulting in a thicker layer of coal and thus an increased pressure difference. If the air flow keeps up while the layer of coal remains unchanged, the impact is not significant.
Reply to 4# huchsh: I tried it out in practice. After increasing the load, I found that increasing the opening angle of the baffle led to an further increase in the differential pressure, while decreasing the baffle’s opening angle caused the differential pressure to decrease slightly. I don’t understand why!
Of course, it’s not the increase in air volume that causes an increase in pressure difference. Under normal circumstances, as the air volume increases (along with an increase in load), the pressure difference should decrease. If the pressure difference increases rapidly when the air volume goes up, it indicates that there is a clear tendency for coal to clog the grinder. In such a situation, if you don’t reduce the load immediately and increase the air volume, then you’re basically preparing to clean the coal out of the grinder
Reply to 5# ruyifengyu: Whenever load is increased, it is necessary to first open the large air valves to increase the air flow (unless the air flow is already very high). When the pressure difference rises, there are only two possibilities: either you acted too quickly and the system has not yet stabilized, or the resistance in the mill is high, meaning there is a lot of coal at the air inlet of the mill. In such cases, it is even more important to open the large air valves. Under no circumstances should the valves be closed if the load is not reduced; otherwise, the pressure difference may first decrease slightly before increasing significantly again, eventually leading to a shutdown due to coal blockage.
Reply to 7# shell gasification job application: Why does the air volume pressure difference decrease first when the load increases?
Is no one going to answer the question? . . . . . . . .
The last edit to this post was made by shell Gasify job hunting on 2010-7-4 at 11:13; reply to 8# ruyifengyu: Why does the pressure difference decrease when the air flow rate decreases? Think about it: if the air flow is reduced to zero, will there still be a pressure difference? It’s recommended that you think more before asking questions so that you can get useful answers.
Reply 10# shell gasification job search: Even when the air flow is reduced to zero, a pressure difference still exists as long as coal continues to be fed in! If what you say is true, then the lower the air flow rate, the lower the pressure difference? You previously said that reducing the air flow when increasing the load would cause the pressure difference to first decrease and then increase. I’m asking why it decreases first If the coal can be carried away during the process of reduced air flow, will the differential pressure increase later on?