SU90667A1 - Device to inject secondary air into pulverized coal and other furnaces of steam boilers - Google Patents

Description

The proposed device for injecting secondary air into pulverized coal and other furnaces of steam boilers differs from the known devices of this kind in that, in order to prevent the walls of the air supply pipe from burning, the latter is surrounded by pipes in which the boiler water forcibly circulates.

FIG. 1 shows a steam boiler furnace In a vertical section with a vertical installation of the air duct; in fig. 2 is a device for introducing secondary air in a cross section of FIG. I; in fig. 3-firebox in vertical section with a horizontal installation of the air duct; “And FIG. 4 is a view of the duct of FIG. 3 from the end; on fit. 5-firebox in vertical section with horizontal installation of the air duct and parallel arrangement of the cooling pipes; in fig. 6 and 7 view of the air duct, made in two versions, from the end.

The device is designed to inject secondary air into pulverized coal or other fireboxes / steam boilers, and this air is introduced into the center of the crowd directly into the core of the torch.

The device is an air inlet pipe 2, the living section of which is made in various configurations: rectangular (Fig. 2), oval (Fig. 4 and 6) and others.

In order to protect the walls 3 of the air inlet pipe 2 from combustion, they are surrounded by pipes 4 through which cooling liquid is forcedly circulated (boiler water is mainly used). The pipes 4 on the air intake pipe 2 are arranged in dense rows and form a flat cooling surface. Due to this, air supply pipes 2 can be installed in the firebox / in any position and of various lengths, as well as freely installed in that part of the firebox where the temperature is high.

The pipes 4 can be located relative to the axis of the air supplying pipe 2 in parallel (Fig. 1, 2, 5 and 6), in a spiral (Fig. 3, 4 and 7), and so on.

At the air outlet points, the pipes 4 are folded back and form the outlets 5, the latter are located either at the end of the air duct or at its length.

The dusty mixture is fed into

The furnace 1 is equipped with a conventional means through a burner 6 located in the burner. During the fuel combustion process, a flame is formed in the furnace, and to ensure complete combustion of the burner through the air supply pipe 2, secondary air is introduced into the furnace, which is introduced into the center of the furnace through holes 5. Circulator The boiler water qi through pipes 4 ensures that the walls of the air inlet pipe are protected from burning.

Subject invention

A device for injecting secondary air into pulverized coal and other furnaces of steam boilers with its supply directly to the flame core, characterized in that, in order to prevent the walls of the air duct from burning, the latter is surrounded by pipes within which the boiler is forced to circulate water.

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No. 90667

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