Composite sealing device and method for utility boiler roof

Abstract

The invention relates to a combined sealing device of a furnace roof of electric stations and a sealing method thereof. The combined sealing device of the furnace roof consists of a furnace roof steelplate and a ceramic fiber sealing layer that is arranged on the furnace roof steel plate and consists of three ceramic fiber layers, a high-temperature binding agent that is arranged between each twoceramic fiber layers and a steel wire that is paved on the upper surface of the three ceramic fiber layers, a lower refractory plastic material layer and an upper refractory plastic material layer are sequentially arranged on gaps of the furnace roof steel plate, a thin plastic clapboard is arranged between the upper and the lower refractory moldable material layers, and a layer of metallic filmis bond on a top surface of the topmost ceramic fiber layer. The sealing method thereof comprises following essential steps: a plurality of spiral reinforcing steel bars are welded transversely at intervals at a working surface of the furnace roof steel plate, and the lower refractory plastic material layer is pouring cast; after the thin plastic clapboard is paved on the lower refractory plasticmaterial layer of reinforced concrete, the upper refractory plastic material layer is pouring cast; three to five ceramic fiber layers are paved on the upper refractory plastic material layer, and onelayer of metallic film is bond on the top surface of the topmost ceramic fiber layer, consequently the sealing method simultaneously reduces cracks of the sealing layer and prolongs crack channels ofthe sealing layer, increases the damping of smoke gas, lowers the flow speed of smoke gas, provides well sealing effect and can avoid the peeling and the destroying of the ceramic fiber layers.

Description

technical field [0001] The invention relates to a combined sealing device and a sealing method for a power station boiler top, in particular to a combined sealing device and a sealing method for a power station boiler top. Background technique [0002] As we all know, air leakage and ash leakage on the boiler roof are common problems in power plant boilers. In the prior art, a refractory plastic layer ( Such as: asbestos high-temperature-resistant materials) to form a sealing layer, and the expansion of the pipe on the top of the boiler is uneven when heated, which will make the gaps or cracks on the top of the furnace uneven in size, and the refractory plastic layer is often caused by insufficient expansion of the refractory plastic If cracks appear, there will still be high-temperature flue gas rushing out directly to cause flue gas leakage. [0003] In recent years, some power boilers have been filled with a ceramic fiber layer with a large expansion in the gaps or crack...

AI Technical Summary

Problems solved by technology

[0002] As we all know, air leakage and ash leakage on the boiler roof are common problems in power plant boilers. In the prior art, a refractory plastic layer ( Such as: asbestos high-temperature-resistant materials) to form a sealing layer, and the expansion of the pipe on the top of the boiler is uneven when heated, which will make the gaps or cracks on the top of the furnace uneven in size, and the refractory plastic layer is often caused by insufficient expansion of the refractory plastic If cracks appear, there will still be high-temperature flue gas rushing out directly, causing flue gas leakage

[0003] In recent years, some power boilers have been filled with a ceramic fiber layer with a large expansion in the gaps or cracks of the roof steel plate. This sealing layer can better absorb the expansion of the boiler roof gap, that is, it can reduce the cracks. The air leakage rate of the boiler has been greatly reduced. However, due to the large difference in the size of the roof gap in the high-temperature environment, and the performance of the ceramic fiber material in the high-temperature environment is also difficult to maintain stable elasticity. Therefore, the ceramic fiber sealing layer itself is still there are some gaps

Images