Non-metal expansion joint for solving problem of non-uniform expansion of large-caliber flue

Abstract

The invention discloses a non-metal expansion joint for solving the problem of non-uniform expansion of a large-caliber flue. Two metal frames are symmetrically arranged at two ends of a square non-metal expansion joint body, inner lining plates are arranged at the bottoms of the inner sides of the two metal frames respectively, a steel mesh covers the inner lining plates, a heat insulation sleeveis embedded in a formed space, a telescopic body covers the top of the heat insulation sleeve and compresses the heat insulation sleeve, then two ends of the telescopic body are fixedly connected with the two metal frames respectively, the metal frames are formed by splicing sectional type modules, and the sectional type modules are connected through corrugated assemblies. Expansion gaps are formed in the metal frames of the non-metal expansion joint at the intervals of 2000 mm in the circumferential direction, an expansion wave joint is arranged at each gap for absorbing and eliminating non-uniform expansion caused by inconsistent heating of the metal frames of the expansion join, and thus the tension fracture and air leakage conditions of the non-metal expansion joint of a primary air chamber of a boiler are thoroughly eliminated.

Description

technical field [0001] The invention relates to the technical field of thermoelectric facilities, in particular to a non-metallic expansion joint for solving uneven expansion of a large-diameter flue. Background technique [0002] A large domestic boiler factory manufactures 200-300MW CFB boilers. The bottom of the furnace is a water-cooled air distribution plate and a primary air chamber. At the same time, it is designed with an oil gun ignition device under the bed. A large-diameter non-metallic expansion joint is designed outside the primary air chamber. The size of the interface is 30 meters long and 4.5 meters wide. When the boiler is started, because the ignition temperature of the oil gun is very high, it is easy to happen that the primary air chamber and the furnace are not uniformly heated in an instant, and the deformation and stretching range caused by thermal expansion are inconsistent, resulting in a primary The overall service life of the air chamber expansion ...

AI Technical Summary

Problems solved by technology

[0002] A large domestic boiler factory manufactures 200-300MW CFB boilers. The bottom of the furnace is a water-cooled air distribution plate and a primary air chamber. At the same time, it is designed with an oil gun ignition device under the bed. A large-diameter non-metallic expansion joint is designed outside the primary air chamber. The size of the interface is 30 meters long and 4.5 meters wide. When the boiler is started, because the ignition temperature of the oil gun is very high, it is easy to happen that the primary air chamber and the furnace are not uniformly heated in an instant, and the deformation and stretching range caused by thermal expansion are inconsistent, resulting in a primary The overall service life of the air chamber expansion joint can only be maintained for about 2 years, and a large number of weld cracks and air leakage began to occur, and the outer skin was directly damaged, which brought great hidden dangers and maintenance to the long-term safe operation of the boiler. cost

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