Problems with the grid bricks in coke oven regenerators
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This post was last edited by angryant on 2016-9-26 20:47. Do the checkerboard bricks have larger holes at the top or at the bottom? I haven’t been involved in engineering projects, so I don’t know much about this issue. I would appreciate your advice.
The grid bricks are larger at the bottom and smaller at the top. This design was adopted after taking into account the changes in resistance within the regenerator.
What was mentioned upstairs is one factor; there is also the factor of volume change due to changes in gas temperature.
This post was last edited by dmz329227 on 2009-6-6 08:47. The upper and lower diameters of the grid bricks are the same; they are generally rectangular in shape with rounded edges. There are bricks with nine holes, eight holes, six holes, and others as well. Usually, the top layers of the grid bricks in a furnace contain a higher proportion of low-aluminum material. In the furnaces used by our company, there are 23 layers of grid bricks in total – the upper 4 layers use N1036 material, while the lower layers use N1035 material. What was mentioned above refers to the arrangement of the grid bricks; however, this arrangement is not necessarily such that the holes are larger at the top and smaller at the bottom, or vice versa. It depends mainly on the resistance of the airflow, with the goal of reducing uneven distribution of airflow within the regenerative chamber and ensuring that the flow rate of air entering the flame channel is roughly equal
The 5th floor mentioned it quite comprehensively; we use 9-hole grid bricks.
6# Li Zhao: The pore sizes on the upper and lower sides of grid bricks are the same; what differs is the pattern of the bricks. Currently, 9, 12, and 16 pores are commonly used
It seems it’s not as people say; whether it’s 9-hole or 12-hole grid bricks, the hole diameters at the top and bottom cannot be the same. The lower aperture is definitely larger than the upper one. I won’t mention the specific reasons; you can look them up on your own. This topic is good; it deserves a rating.
I’m completely confused about which of these two different views is correct and which is wrong; could some authoritative person please shed some light on this?
1. The upper and lower pore diameters of lattice bricks are the same, while those of grating bricks differ; this is done to ensure that both upward and downward air currents are distributed evenly along the entire length of the regenerator. 2. Lattice bricks typically have 6 or 9 pores
The upper and lower holes of the lattice brick are of the same size. Please take a look at the figure below:
The holes in the lattice bricks are all of the same size; the brick type remains identical from bottom to top. It’s sufficient to ensure that the bricks are aligned properly when stacked. Last year, after constructing the furnace, we found that the hole sizes of the lattice bricks varied – some had larger holes at the top and smaller ones at the bottom, while others had smaller holes at the top and larger ones at the bottom. There is also a certain pattern to these variations. The specific dimensions and arrangement rules are provided by the thermal engineering institute; generally, the brick design drawings do not include such details.