Stainless steel three-dimensional expansion joint used for sealing high temperature ash and slag

Abstract

The invention discloses a stainless steel three-dimensional expansion joint used for sealing high temperature ash and slag. The expansion joint comprises an upper inner guiding tube 1, a lower inner guiding tube 2, a horizontal expansion chamber 3, a fluted tube 4, an upper cap 5, an alumina silicate fiber punched carpet tied by stainless steel wire net 6, an alumina silicate fiber punched carpet 7, a sealing filler chamber 8 between the upper inner guiding tube and the lower inner guiding tube, a horizontal expansion ring 11, an expansion joint outlet cap 10, and a sealing filler chamber 9 arranged between the horizontal expansion ring and the expansion joint. A gap of only 1mm is configured between 1 and 2, and the gap can be reliably sealed by the sealing filler chamber 8, such that flue gas refluxing can be prevented, and ash and grains in the slag can be prevented from refluxing to the fluted tube. The horizontal expansion ring 11 is provided in the lower inner guiding tube. The sealing filler chamber 9 and the horizontal expansion chamber 3 are provided between the horizontal expansion ring 11 and the expansion joint outlet cap 10, such that sufficient expansion and reliable sealing can both be ensured. The alumina silicate fiber punched carpet tied by stainless steel wire net is filled between the sealing filler chambers 8 and 9.

Description

technical field [0001] The invention relates to a circulating fluidized bed boiler, in particular to a high-temperature ash-slag stainless steel three-way expansion joint. Background technique [0002] my country is currently the country that uses the most circulating fluidized bed boilers (CFB boilers) in power plants in the world. There are more than 3,000 large and small circulating fluidized bed power plant boilers in operation, including large circulating fluidized bed power plant boilers with a capacity of 410t / h or more. There are more than 140 sets, and there are more than 20 sets of large-scale circulating fluidized bed power plant boilers above 1025t / h (more than 50 sets are under construction). [0003] The furnace of the circulating fluidized bed boiler in the power station has a four-sided furnace wall structure with a cone in the lower part and a rectangular column in the upper part. The slag discharge port is arranged at the part of the lower cone close to the ...

AI Technical Summary

Problems solved by technology

The existing circulating fluidized bed boiler slagging pipe adopts the traditional gas medium three-way expansion joint. In order to solve the problem of full expansion in two directions of the horizontal plane, the gap between the two inner sleeves has to be increased (that is, enough expansion gap is left), but this It brings about sealing problems. Fine ash and fine particles can easily flow to the stainless steel bellows through the gap between the two sleeves under the pressure of about 8000KPa. Although the existing three-way expansion joints have also adopted some measures, the gap between the two inner sleeves cannot be excessive. Long-term dust accumulation in the seal will affect the expansion and life of the wave node

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