Slagging tube of fluidized-bed boiler

Abstract

The invention discloses a slagging tube of a fluidized-bed boiler, which comprises a membrane type cooler as an annular cooling tube stack circled by a plurality of cooling tubes, and the inner side of the annular cooling tube stack is coated with a wear-resistant and heat-resistant castable; each cooling tube is further communicated with a water inlet main pipe and a water outlet main pipe respectively, the water inlet main pipe is communicated with a condensation water inlet pipe, and the water outlet main pipe is communicated with a condensation water outlet pipe. Or, the slagging tube comprises a slagging round tube and a plurality of cooling tubes arranged on the wall of the slagging round tube in the circumferential direction of the slagging round tube; each cooling tube is further communicated with a water inlet main pipe and a water outlet main respectively, the water inlet main pipe is communicated with a condensation water inlet pipe, and the water outlet main pipe is communicated with a condensation water outlet pipe. According to the invention, the traditional slagging tube is replaced by the cooling tubes, the slagging tube is prevented from generating thermal deformation which causes welding seam tearing, and the temperature of an outer wall of the slagging tube achieves a safe value. The work environment of the slagging tube is improved, so that the fluidized-bed boiler can operate more safely and stably.

Description

technical field [0001] The invention relates to a slag discharge pipe, in particular to a fluidized bed boiler slag discharge pipe. Background technique [0002] The slag discharge pipe is the connecting pipe between the slag discharge outlet of the circulating fluidized bed boiler and the slag cooler. The material used is high temperature resistant alloy steel pipe, and there is no external insulation. The hot slag temperature of the circulating fluidized bed boiler is generally 900°C. Due to the high slag temperature, the temperature of the outer wall of the slag discharge pipe is greater than 50°C, resulting in heat loss. In severe cases, thermal deformation and tearing of the weld seam will result, resulting in fire and slag spray leakage Failure, affecting personnel safety and boiler operation. When the unit is running, the electric door designed on the slag discharge pipe is subject to strong high-temperature radiation, and the internal electronic components are frequ...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a fluidized bed boiler slag discharge pipe, which solves the problem that the slag discharge pipe is prone to thermal deformation, tearing welds, and has a short service life, and can make the electric door involved in the slag discharge pipe work normally

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