The orifice plate issue in the gas pipes in the basement
Thread Content
How is the orifice diameter of the heating coal gas pipeline in the coke oven basement determined? Is there any empirical formula?
Orifice plates come in large and small sizes; which one are you referring to? I’ve already posted the detailed calculation methods before; if I post them again, will the moderators consider it a duplicate post? Besides, those who haven’t gone to school can still do a great job of adjusting the flame. There’s no need to calculate many things; it’s sufficient to make adjustments based on the required temperature. If the temperature is too high, use a smaller orifice plate, and vice versa – just ensure that the pressure in the main pipe remains within the specified range.
What you’re referring to seems to be a balance orifice plate. For such plates, we make adjustments based on the temperature and pressure conditions in actual production; no calculations are required. The main consideration is ensuring that the amount of gas supplied to the combustion chamber is sufficient to achieve the desired heating temperature, while also keeping the main pipe pressure within the range of 2000 Pa, not below 900 Pa – around 1500 Pa is ideal. If the gas pressure is too high, it can lead to severe gas leaks in the basement, causing the gas to accumulate there; turning the valves or making repairs can result in fires and explosions. If the pressure in the main gas lines is too low, even approaching the minimum level of 500 Pa, it still poses a safety risk and hinders safe operations.
Reply to 3# qin6708: Let me say a few words. Try not to use too formal language. Coke ovens aren’t that complicated actually; all you need to do is ensure that all the burners are unobstructed, check their temperatures regularly, insert wires in the larger ones and replace those in the smaller ones. The main thing is to prevent tar from clogging them up. You’ll understand everything after working in the basement for a couple of days
In our line of work, the main thing to pay attention to is avoiding negative pressure and open flames; basically, there are no major issues
Reply 4# Lai A Shu: In the basement, there are two types of orifice plates – balance orifice plates and small orifice plates (or nozzles) – which are installed in different locations. The balance orifice plates are installed between the addition and reduction valves as well as the switching valves; there are only two of them per row of combustion chambers, and they control the amount of gas that enters a particular row of combustion chambers. The smaller orifice plates are placed between the horizontal pipes and the vertical pipes, with 28 or 32 of them per row; if these plates become clogged, they can be replaced. They control the amount of gas that flows from the horizontal pipes to each burner channel.