Use a square circulation groove?
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The newly installed 400Kt/a pyrite-based acid production system in my company features two rotating stages and two absorption stages, along with two horizontal circulation tanks – one drying circulation tank with a volume of around 12 cubic meters and an absorption circulation tank with a volume of around 30 cubic meters. I’m not sure if there is any experience with the use of square circulation tanks in China; currently, the design documents provided by design institutes generally depict circular tanks. In my opinion, the reasons for this are as follows: First, it’s easier to control the capacity, and having access holes at the top facilitates cleaning； II. The quality of acid-resistant lining bricks is easy to control; the upper part of the lining in circular grooves is built in an arched shape, and voids are generally present there. If a square groove is used, 316L for the cover plate should be sufficient. III. The external dimensions are slightly larger than those of a circular groove, but the space available for the dry absorption section generally meets the requirements. Is this feasible? Please give some feedback :) This post was last edited by in the blink of an eye on 2007-12-28 08:17.]
Thermal expansion should be the same for lining equipment at the same operating temperature. The square groove may be slightly larger, and this can be addressed by increasing the thickness of the asbestos layer. I am mainly concerned about the difficulty in ensuring the quality of lining installation for circular equipment. On one hand, it is hard to guarantee the quality of processing special-shaped bricks; on the other hand, the tank itself is a non-standard piece of equipment, and there are already errors in its dimensions, making it difficult to fit the special-shaped bricks properly.
A square shape is not a good structure for thermal expansion, and using asbestos sheets alone cannot solve the problem.
On the first floor, there’s a worker, I guess. Circular shapes use less material and cost less money compared to square shapes. In the past, the circulation tanks were built in the form of vertical cylindrical tanks; it was very difficult to deal with corrosion on the bottom plates, so now they are made in the form of horizontal cylindrical tanks.
The eight corners of the square groove are the points most prone to corrosion and leakage, and they are very difficult to deal with. Furthermore, from a stress perspective, longitudinal welds in square grooves are prone to cracking. From a process perspective, square grooves tend to cause uneven mixing of acids.
:Lol, it’s good that those on the first floor are good at thinking! It is not impossible to use a square shape for the circulation tank, but the casing needs to be **strengthened; even then, deformation cannot be guaranteed to be avoided. The challenges associated with lining bricks vary from case to case. However, if square grooves are not reinforced, they are prone to compression deformation, which results in cracks in the brick joints. What is the result of cracking? As for the cover plate issue, if one is willing to spend money on a 316L cover plate, a round groove can also be created. Bricks can be filled to about 4/5. The upper part is transition-connected using 316L lining or directly with this material. It’s easy, but it costs money. Additionally, your company’s 400Kt/a pyrite-based acid production system features two rotating stages and two absorption stages, along with two horizontal circulation tanks; the drying circulation tank has a volume of around 12 cubic meters, while the absorption circulation tank has a volume of around 30 cubic meters. Are the tanks really that small? The underground channel can’t be that big, right? Should we recalculate it?
If the bottom of the tower is used as a circulation tank as well, small tanks can be employed. But a square groove is a poor choice; trying to cheat will result in heavy losses. This post was last edited by boqing on 2008-3-20 02:30]
Unless it is made of a high-silicon alloy, but even then the casing needs reinforcing ribs. This post was last edited by in the blink of an eye on 2008-3-20 09:41]
In fact, using square grooves for cleaning is very inconvenient; during use, the four corners are prone to corrosion. In geometry, among common shapes such as rectangles, circles, and triangles, when the perimeters are equal, the circle has the largest area. Conversely, given the same area, the circle has the smallest perimeter, which means it requires the least amount of material in terms of manufacturing.