Membrane hearth structure of low-speed circulating fluidized bed boiler

Abstract

The invention provides a membrane wall hearth structure for a low-speed circulating fluidized bed boiler. The membrane wall hearth structure comprises a horizontal water cooling separator, a center air outlet barrel, a front membrane wall, a back membrane wall, a left membrane wall, a right membrane wall and a center membrane wall. The top of the center membrane wall is hung in the boiler through a hearth hanging device. The center line of the center air outlet barrel is horizontally arranged. The front end of the center air outlet barrel stretches into the horizontal water cooling separator. The front membrane wall, the back membrane wall and the center membrane wall are each internally provided with a circulating water pipe. The center air outlet barrel is arranged on the back membrane wall. The back end of the back membrane wall stretches out of the back membrane wall. According to the outwards-pulled horizontal water cooling center air outlet barrel structure, not only are the drawbacks of expansion, high temperature, abrasion and tearing of an original heat insulating structure well overcome, but also the safety of water circulation is fully considered; the separation efficiency and the applicability of the horizontal water cooling separator are improved, high-temperature coking and damage deformation are not prone to happening to the center air outlet barrel, and the operation cycle of the boiler is greatly prolonged; and in addition, materials are saved, and the cost of the whole boiler is reduced.

Description

technical field [0001] The invention belongs to the technical field of boilers, and in particular relates to a low-speed circulating fluidized bed boiler with a membrane hearth structure with a horizontal membrane water-cooled center outlet tube and a water-cooled separator. Background technique [0002] In the low-speed circulating fluidized bed boiler, there is a high-temperature separator cylinder of a circulating fluidized bed boiler that is formed by bending the upper part of three membrane walls of the boiler furnace. This kind of separator is arranged horizontally, and the separator cylinder The body frame is the furnace membrane water-cooled wall. The inside and outside of the membrane-type water-cooled wall are covered with a thin layer of refractory and wear-resistant castable. The separated materials flow out of the separator from the lower side of the separator cylinder. The front and rear ends of the separator are It is sealed with the front and rear walls of th...

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Problems solved by technology

[0003] In order to solve the deficiencies in the prior art, the present invention provides a low-speed circulating fluidized bed boiler membrane hearth structure with a simple structure, a central air outlet that is not easy to damage, and a long service life. Moderate central punching bag itself and the expansion of the center punching bag and the back wall of the support are inconsistent, resulting in damage to the center punching bag

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