RU2277684C2 - Ash-protective probe for tubes of heat-transfer tube bunch - Google Patents

Abstract

FIELD: boiler manufacture for protection against rubbing-out at combustion in boilers of coals containing abrasive ashes.

SUBSTANCE: the ash-protective probe for tubes of the heat-transfer tube bunch has for each tube of the tube bunch a stabilization section and a butt-joining section, whose shape is similar to the shape of the tube bunch, differing by the fact that the stabilization section for each tube of the bunch is provided with an inlet cellular component, whose walls are joined to the walls of the adjacent inlet cellular components adjoining them and has a transient section, and the butt-joining section is installed in the tube of the bunch, besides, the walls joined to the walls of the adjacent cellular components have a welded attachment in the points of butt-joining.

EFFECT: enhanced adaptability to mounting and maintainability whenever it is necessary to replace the ash-protective probe and bunch tubes.

1 dwg

Description

The invention relates to the field of boiler construction for protection against abrasion when burning coal in boilers containing abrasive ash, which passes with flue gases inside the vertical pipes of the heat exchange bundle, causing wall erosion and premature exit of the pipes.

Known for the closest purpose ash protection nozzles for tubes of a heat exchange beam, containing for each tube of the beam stabilization section and a docking section, the shape of which is similar to the shape of the beam pipe [1].

A disadvantage of the known device is the lack of manufacturability associated with the difficulty of ensuring alignment of the beam pipes and the stabilization sections of the ash protection nozzle, and maintainability if necessary, replace the ash protection nozzle and beam pipes in the presence of its welded joints with heat transfer beam pipes.

The technical result achieved by the invention is to increase the manufacturability of installation and maintainability, if necessary, replace the ash protection nozzle and tube bundles.

The technical result is achieved due to the fact that in the ash protection nozzle for tubes of a heat exchange beam containing for each beam pipe a stabilization section and a docking section, the shape of which is similar to the shape of the beam pipe, according to the invention, the stabilization section for each beam pipe is equipped with an input honeycomb whose walls are closed with adjacent walls of adjacent cellular elements, has a transition section, and the docking section is installed in the beam pipe. Additionally, the technical result in the claimed device can be achieved due to the fact that the walls of adjacent honeycomb elements are welded to the joints.

The drawing shows an ash protection nozzle for tubes of a heat transfer beam.

An ash protection nozzle for tubes 1 of the heat exchange bundle, containing for each tube 1 of the bundle a stabilization section 2 and a docking portion 3, the shape of which is similar to the shape of the tube 1 of the bundle, the stabilization section 2 for each tube 1 of the bundle is equipped with a similar honeycomb element 4, the walls of which are connected to adjacent to it has the walls of adjacent input honeycomb elements 4, and has a transition section 5, and the docking section 3 is installed in the tube 1 of the beam, while the walls of adjacent honeycomb elements 4 have a welded fastening 6 at the joints. The ash protection nozzle is as follows. The flow of dusty gases enters the input honeycomb elements 4 at low, maximum possible speeds, about 2 times lower than in the tubes 1 of the heat exchange beam. This allows you to reduce the erosion of the nozzle itself by more than ten times, providing them with a service life of at least the life of the heat transfer pipes 1. In the area of the honeycomb elements 4, the ash partially stabilizes around the vertical axis of the pipes. Further, the flow smoothly accelerates in the transition section 5 and finally stabilizes in the stabilizing section 2 near the axis of the pipe 1. Here, the ash is collected by the gas flow to the axis of the pipe 1 and, almost without touching the walls of the stabilizing section 2, flows coaxially into the heat exchange pipes 1.

If necessary, repair with the replacement of the ash protection nozzle or pipe 1 of the heat transfer beam, the structure is quickly disassembled and reassembled.

This increases the manufacturability of installation and maintainability if necessary, replace the ash nozzle and tube bundles.

The source of information

1. Uporov A.P., Migai V.K., Sobolevsky S.Yu. and Petunin A.M. "Study of the productive wear of the inlet sections of air heaters", g. "Heat Power Engineering", 1985, No. 8, p. 32-31, Fig. 1.

Claims (1)

An ash protection nozzle for tubes of a heat exchange beam, containing for each beam pipe a stabilization section and a connecting section, the shape of which is similar to the shape of the beam pipe, characterized in that the stabilization section for each beam pipe is equipped with an input honeycomb element, the walls of which are connected to adjacent walls of adjacent input cellular elements, and has a transitional section, and the docking section is installed in the beam tube, in addition, the walls are closed with adjacent adjacent walls of the cellular elements to them by welded attachment to the docking locations.