What is the type of expansion joint for the flue gas pipeline at the outlet of the desulfurization tower?
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The flue gas pipeline at the outlet of the desulfurization tower has a diameter of DN1600, with a pressure of 100 kPa and a temperature of 55°C. The flue gas is highly corrosive; the expansion joints available include those with steel linings covered in PTFE or rubber combined with PTFE. I would like to ask everyone what type and material of expansion joint would be suitable for flue gas under such conditions. Thank you! This post was last edited by lyhh9024 on 2009-2-8 08:55.]
Rubber Teflon is generally used, which can overcome three-dimensional displacement； However, rubber and PTFE have a short lifespan; some companies require the use of alloy expansion joints, and these are also used in China! This post was last edited by la9975956 on 2009-2-8 07:30.]
Expansion joints with a steel lining and PTFE are more suitable
What was said upstairs is correct; generally, rubber and PTFE are used. Alloy versions are also used, but there are special requirements for their prefabrication during installation
Rubber-Teflon is better, as it can compensate for displacements in all directions as well as installation errors
Non-metallic expansion joints. The belt is made of PTFE rubber, with glass fiber cloth coated in silicone rubber, and multiple layers of stainless steel mesh combined together ； Takeover, flanges made of Q345 ； The inner guide tube is made of 316L.
Is there something wrong with the topic posed by the original poster? Could the pressure of the flue gas at the outlet of the desulfurization tower really be as high as 100 kPa? Generally, compensators on desulfurization pipelines are made of non-metallic materials, but this becomes difficult at such high pressures.
Most expansion joints in FGD flues are non-metallic expansion joints, which consist of fluoroplastic or fluororubber sheets reinforced with fibers or wires, or compounded and reinforced with fiber and wire meshes, insulating material, internal baffles, and connection flanges.
Non-metallic compensators are generally used, made of multi-layer fluororubber, and capable of absorbing three-dimensional displacements. There are also a few cases where alloy expansion joints made of materials such as 1.4529 are used, but metal expansion joints can only absorb axial displacement.
Non-metallic compensators are generally used, made of multi-layer fluororubber that can absorb displacements in three directions； But a drainage device needs to be installed!