Cavity type chimney head rain cover system

Abstract

The invention provides a cavity type chimney head rain cover system comprising a rain cover surrounding the exterior of a smoke evacuation internal cylinder. A cavity is formed between the rain coverand the smoke evacuation internal cylinder, and supported by a support structure connected to the outer wall of the smoke evacuation internal cylinder and the interior of the rain cover; the tops of the smoke evacuation internal cylinder and the rain cover are sealed through titanium-steel clad plates. The cavity type chimney head rain cover system disclosed by the invention is good in heat insulation effect and low in construction cost, and the overhead workload is reduced, so that the system facilitates of construction. The connection between the bottom of the rain cover and an external concrete cylinder adopts the form that the outer edge of a baseplate is buckled inward, and a corrosive liquid collecting part is formed near the internal cylinder; and corrosive liquid is discharged through a sandwich layer between the internal cylinder and an external cylinder, so that corrosion of wall beacon paint of the external cylinder and other ancillary facilities is avoided effectively, andthe stability and appearance durability of the external cylinder structure are ensured.

Description

technical field [0001] The invention relates to a rainproof cover for an inner tube of a chimney, in particular to a cavity type chimney tube bow rainproof cover system. Background technique [0002] According to the anti-corrosion chapter of "Code for Design of Chimneys" (GB50051-2013): For wet flue gas operating conditions, it is recommended to use sleeve-type anti-corrosion metal lining, sleeve-type lightweight anti-corrosion brick lining or glass fiber reinforced plastic inner cylinder. It is not recommended to choose the single-tube chimney structure; therefore, domestic desulfurization wet chimney anticorrosion renovation and new chimneys generally adopt the sleeve type structure, that is, the smoke exhaust system is arranged separately from the main concrete structure, and an independent smoke exhaust steel pipe is newly built inside the original concrete chimney. However, with the large-scale development of domestic wet desulfurization systems, ordinary steel inner c...

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Problems solved by technology

[0002] According to the anti-corrosion chapter of "Code for Design of Chimneys" (GB50051-2013): For wet flue gas operating conditions, it is recommended to use sleeve-type anti-corrosion metal lining, sleeve-type lightweight anti-corrosion brick lining or glass fiber reinforced plastic inner cylinder. It is not recommended to choose the single-tube chimney structure; therefore, domestic desulfurization wet chimney anticorrosion renovation and new chimneys generally adopt the sleeve type structure, that is, the smoke exhaust system is arranged separately from the main concrete structure, and an independent smoke exhaust steel pipe is newly built inside the original concrete chimney. However, with the large-scale development of domestic wet desulfurization systems, ordinary steel inner chimneys are no longer suitable for new operating conditions. Therefore, corrosion-resistant metals or lightweight anti-corrosion bricks are used for the parts in contact with flue gas, but in The inner tube of the chimney protrudes from the outer concrete tube, facing harsh environments such as external rainwater and ultraviolet rays, and multiple corrosions such as internal flue gas diffusion and acid rain. This part is the end part of the flue gas discharge. At the current design stage, the design of the first device of the chimney is different. However, they are all designed according to the traditional dry flue gas mode, and there are certain problems in the sealing method, heat preservation form, rainproof cap and other forms. On the one hand, the sealing failure will cause flue gas corrosion; Condensation, causing acid rain in the vicinity and icing in the northern region, which has hidden dangers to the stable operation of the chimney

[0003] The newly built steel inner cylinder / titanium steel composite plate inner cylinder sleeve chimney generally adopts directly welded stainless steel plate for the rain cover device at the head of the cylinder, and the inside is filled with thermal insulation materials, and the bottom is covered with the platform at the outer cylinder to drain the enriched liquid The outer wall of the outer cylinder causes the navigation mark paint to corrode and fall off

This method has the disadvantage that a complete protective layer cannot be formed at the head of the barrel, and there is a weak anti-corrosion part at the connection between the rainproof cap at the head of the barrel and the inner barrel body, and the force-bearing position is located at the edge of the inner barrel, which is very easy to be corroded and then fall off

In addition, due to the lack of concrete wall at the head of the chimney, the temperature drop is significantly aggravated, and the "smoke and rain wash down" is aggravated. The smoke, rain and environmental rainwater are enriched on the head platform or flow along the outer cylinder, causing partial corrosion of the concrete and affecting the appearance and safety and stability of the chimney.

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