RU2400668C1 - Fire chamber for combustion of gas-black oil fuel - Google Patents

Abstract

FIELD: machine building.

SUBSTANCE: side surface of fire chamber for combustion of gas-black oil fuel contains walls of gas chamber and screens repeating internal surface of fire chamber. The side surface is made as two truncated cones facing one another with their big bases at angle at bigger base 75÷80°.

EFFECT: increased reliability owing to increased service life of screen surfaces.

2 dwg

Description

The invention relates to devices for furnaces of steam boilers with a counter layout of gas-oil burners.

Known furnace of a steam boiler, made in the form of a rectangular parallelepiped and containing screens of a rectangular shape, equipped with counter burners (Makarov A.N. Distribution of heat fluxes in the furnace of a steam boiler TGMP-204. // Electric stations. - 2003. - No. 1. - C .20-25).

The disadvantage of this form in combination with oncoming burners is the uneven distribution of heat fluxes along the height of the furnace.

Closest to the technical nature of the claimed is a furnace for burning gas oil fuel, which includes, under, a vault, the walls of the furnace, screens that repeat the inner surface of the furnace, and counter-mounted burners built into the walls. The furnace is made in the form of two truncated pyramids facing each other with large bases, the small base of the lower part is under, the side walls of the upper are paired with vertical walls that form the shape of a rectangular parallelepiped, while the burners are located at an angle of inclination of 5 ÷ 10 ° to the horizon (RU, No. 2285200, F23C 3/00, 04/18/2005).

The disadvantage of this furnace is the uneven distribution of heat fluxes along the perimeter of the walls. The maximum heat fluxes are observed along the symmetry axes of the furnace walls, and at the periphery of the walls (at the intersection of the faces of the truncated pyramid), their values are approximately two times smaller. This distribution of heat fluxes leads to a decrease in vaporization at the periphery of the walls, to an increase in the intensity of formation of in-pipe deposits along the axis of symmetry of the walls, and contributes to the emergence and development of high-temperature corrosion in the central part of the walls.

All of the above reduces the service life of the screen heating surfaces and, accordingly, reduces the reliability of the entire boiler.

The technical result is to increase the reliability and service life of the screen surfaces of the heating of the furnace and increase the period between acid washing of the boiler.

The specified technical result is achieved by the fact that in the furnace for burning gas oil fuel, which includes, under, a vault, a side surface containing the walls of the furnace and screens repeating the inner surface of the furnace and counter-mounted burners built into the walls, according to the invention, the side surface is made in the form two truncated cones facing each other with large bases with an angle of 75 ÷ 80 ° with a larger base.

With this form of the furnace, all pipes of the screen surfaces are equidistant from the torch created by the burners. The equal distance of the screen tubes from the torch leads to equalization of heat fluxes and vaporization in the pipes along the perimeter of the walls, lower maximum heat loads and increase the life of the screen surfaces. The most optimal angle for large bases of truncated cones is an angle of 75 ÷ 80 °. With this angle, the most uniform distribution of heat fluxes from the plume along the perimeter of the walls is ensured.

The invention is illustrated by drawings, where figure 1 shows a side view (section) of the proposed furnace of the boiler, figure 2 presents a front view (section) of the proposed furnace.

The furnace includes a side surface containing the walls of the furnace 1 and screens 2, 3, repeating the inner surface of the furnace. The side surface is made in the form of two truncated cones facing each other with large bases with an angle at a larger base of 75 ÷ 80 °, the small base of the lower cone is under 4, and the upper one is arch 5. Burners 6 are installed in the opposite walls. Burners 6 create a torch 7 (Figs. 1 and 2 show curves along the height of the isotherm plume; the numbers on the curves are the temperature of the isotherms). In the upper part, the furnace is connected to the convective part of the steam boiler - a gas duct 8.

The furnace works as follows.

When burning in the furnace gas or fuel oil supplied through oncoming burners 6, the combustion core of a vertically located torch 7 is equidistant from the screen heating surfaces 2, 3, thereby providing a noticeable decrease in the maximums of their heat loads and equalization of heat fluxes along the perimeter of the walls 1. Reducing heat load reduces the temperature of the walls of the screens 2, 3 and helps to slow down their corrosion, which, in turn, increases the service life of the screen heating surfaces and the period between acid washing of the boiler.

Currently, the invention is at the stage of a technical proposal.

Claims (1)

A furnace for burning gas oil fuel, which includes, under, a vault, a side surface containing the walls of the furnace and screens that repeat the inner surface of the furnace, and counter-mounted burners built into the walls, characterized in that the side surface is made in the form of two large facing each other the bases of truncated cones with an angle at a larger base of 75 ÷ 80 °.

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