SU70718A1 - Water Tube Steam Boiler - Google Patents

Description

The subject of the invention is a water-tube steam boiler with a shielded furnace located between the side pockets of the ducts in which the heating pipes of the convection heating surface are placed. A distinctive feature of the described boiler is as follows:

a) screen tubes attached to the upper and lower drums are located along the ceiling and rear wall of the combustion chamber;

b) in the masonry of the side furnace walls, air ducts are made for cooling them and for heating the blast air;

c) secondary blow nozzles are located in the upper part of the side combustion walls and are directed towards the ceiling towards the combustion chamber,

FIG. 1 shows a schematic longitudinal section of the proposed boiler; in fig. 2 - section along the AA.

Upper drum 72 is located in front of the masonry boiler along its front; bottom drum 6 - bottom along the back wall of the boiler. The side walls of the firebox 1 are made double and they have flue ducts - pockets 2 and 75. In each

Of these pockets, two sections of heating pipes 3 (counting vertically) are fixed obliquely, fixed with their ends to the front and rear sectional boxes. The front sections are connected to the upper drum 72, and the rear - from the bottom 6.

In the furnace 7, screen tubes 4 are located, extending from the upper drum 72 along the ceiling 7 of the furnace and descending to the lower drum 6 along the rear wall 77 of the furnace. The flue gases rise up and enter the pockets 2 and 75, the passage through which the heating pipes 3 are heated, after which they are directed to the burs 73.

Water is supplied to the lower drum 6, from which it enters the rear sectional boxes of the side pockets 2 and 75 and to the screen pipes 4. The steam line enters the emulsion from the screen pipes 4 and convection sections into the upper drum 72.

A secondary blast is fed through the nozzles 70 of the air channels of the side flue walls S. The nozzles 70 are directed at an angle to the ceiling of the combustion chamber.

Drop pipes 5 go from the top73

it has a drum 72 inside the ceiling and then on the outer side of the rear wall of the boiler and are connected to the lower drum b.

Subject invention

Claims (3)

1. A water-fired steam boiler with a shielded furnace located between the side lowering gas ducts-pockets in which the heating tubes of the convection heating surface are placed, which is characterized by the fact that the screen tubes attached to the top and bottom drums are located along the ceiling and rear wall of the furnace cameras. 2. In the boiler according to claim 1 a secondary blow is applied with nozzles placed in the upper part of the side flue walls and directed at an angle to the ceiling of the combustion chamber. 3. In the boiler on PP. 1 and 2, air channels are used in the masonry of the side flue walls in order to preheat the secondary blast air and to cool the walls. FIG. 2